MICROCHIP PIC18F8722 DATA SHEET

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PIC18F8722 Family

Data Sheet

64/80-Pin, 1-Mbit,

Enhanced Flash Microcontrollers with

10-bit A/D and nanoWatt Technology

 2004 Microchip Technology Inc. Preliminary DS39646B

Note the following details of the code protection feature on Microchip devices:

• Microchip products meet the specification contained in their particular Microchip Data Sheet.

• Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions.

• There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data Sheets. Most likely, the person doing so is engaged in theft of intellectual property.

• Microchip is willing to work with the customer who is concerned about the integrity of their code.

• Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not mean that we are guaranteeing the product as “unbreakable.”

Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our products. Attempts to break Microchip’s code protection feature may be a violation of the Digit al Millennium Copyright Act. If suc h a c t s allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.

Information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of M icrochip’s prod ucts as critical components in life support systems is not authorized except with express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights.

Trademarks

The Microchip name and logo, the Microchip logo, Accuron, dsPIC, K

EELOQ, microID, MPLAB, PIC, PICmicro, PICSTART,

PRO MATE, PowerSmart, rfPIC, and SmartShunt are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.

AmpLab, FilterLab, Migratable Memory, MXDEV, MXLAB, PICMASTER, SEEVAL, SmartSensor and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A.

Analog-for-the-Digital Age, Application Maestro, dsPICDEM, dsPICDEM.net, dsPICworks, ECAN, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB, In-Circuit Serial Programmin g, IC SP, ICEPI C, M PASM, MPLIB, MPLINK, MPSIM, PICkit, PICDEM, PICDEM.net, PICLAB, PICtail, PowerCal, PowerInfo, PowerMate, PowerTool, rfLAB, rfPICDEM, Select Mode, Smart Serial, SmartT el and Total Endurance are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.

SQTP is a service mark of Microchip Technology Incorporated in the U.S.A.

All other trademarks mentioned herein are property of their respective companies.

Printed on recycled paper.

Microchip received ISO/TS-16949:2002 quality system certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona and Mountain View, California in October 2003. The Company’s quality system processes and procedures are for its PICmicro devices, Serial EEPROMs, microperipherals, nonvolatile memory and analog products. In addition, Microchip’s quality system for the design and manufacture of development systems is ISO 9001:2000 certified.

8-bit MCUs, KEELOQ

code hopping

DS39646B-page ii Preliminary  2004 Microchip Technology Inc.

PIC18F8722 FAMILY

64/80-Pin, 1-Mbit, Enhanced Flash Microcontrollers with

10-Bit A/D and nanoWatt Technology

Peripheral Highlights:

• Two Master Synchronous Serial Port (MSSP)

modules supporting 2/3/4-wire SPI™ (all 4 modes) and I

C™ Master and Slave modes

• Two Capture/Compare/PWM (CCP) modules

• Three Enhanced Capture/Comp are/PWM (ECCP)

modules:

- One, two or four PWM outputs

- Selectable polarity

- Programmable dead time

- Auto-Shutdown and Auto-Restart

• Two Enhanced Addressable USART modules:

- Supports RS-485, RS-232 and LIN 1.2

- Auto-Wake-up on Start bit

- Auto-Baud Detect

• 10-bit, up to 16-channel Analog-to-Digital

Converter module (A/D)

- Auto-acquisition cap ab ili ty

- Conversion available during Sleep

• Dual analog comparators with input multiplexing

• High-current sink/source 25 mA/25 mA

• Four programmable external interrupts

• Four input change interrupts

External Memory Interface (PIC18F8527/8622/8627/8722 only):

• Address c apability of up to 2 Mbytes

• 8-bit or 16-bit interface

• 8, 12, 16 and 20-bit Address modes

Power-Managed Modes:

• Run: CPU on, peripherals on

• Idle: CPU off, peripherals on

• Sleep: CPU off, peripherals off

• Idle mode currents down to 15 µA typical

• Sleep current down to 0.2 µA typical

• Timer1 Oscillator: 1.8 µA, 32 kHz, 2V

• Watchdog Timer: 2.1 µA

Special Microcontroller Features:

• C compiler optimized architecture:

- Optional extended in struction set des igned to optimize re-entrant code

• 100,000 erase/write cycl e Enhanced Flash program memory typical

• 1,000,000 erase/write cycle Data EEPROM memory typical

• Flash/Data EEPROM Retention: 100 years typical

• Self-programmable under software control

• Priority levels for interrupts

• 8 x 8 Single-Cycle Hardware Multiplier

• Extended Watchdog Timer (WDT):

- Programmable period from 4 ms to 131s

• Single-Supply In-Circuit Serial Programming™ (ICSP™) via two pins

• In-Circuit Debug (ICD) via two pins

• Wide operating voltage range: 2.0V to 5.5V

• Fail-Safe Clock Monito r

• Two-Speed Oscillator Start-up

• nanoWatt Technology

Program Memory

Device

PIC18F6527 48K 24576 3936 1024 54 12 2/3 2 Y Y 2 2 2/3 N PIC18F6622 64K 32768 3936 1024 54 12 2/3 2 Y Y 2 2 2/3 N PIC18F6627 96K 49152 3936 1024 54 12 2/3 2 Y Y 2 2 2/3 N PIC18F6722 128K 65536 3936 1024 54 12 2/3 2 Y Y 2 2 2/3 N PIC18F8527 48K 24576 3936 1024 70 16 2/3 2 Y Y 2 2 2/3 Y PIC18F8622 64K 32768 3936 1024 70 16 2/3 2 Y Y 2 2 2/3 Y PIC18F8627 96K 49152 3936 1024 70 16 2/3 2 Y Y 2 2 2/3 Y PIC18F8722 128K 65536 3936 1024 70 16 2/3 2 Y Y 2 2 2/3 Y

 2004 Microchip Technology Inc. Preliminary DS39646B-page 1

Flash

(bytes)

# Single-Word

Instructions

Data Memory

SRAM

EEPROM

(bytes)

I/O

10-bit

A/D (ch)

CCP/

ECCP

(PWM)

MSSP

SPI™

Master

C™

Timers

EUSART

Comparators

8/16-bit

External Bus

PIC18F8722 FAMILY

Pin Diagrams

64-Pin TQFP

(1)

/P2A

(1)

RE1/WR/P2C

/P2D

RE0/RD

RG0/ECCP3/P3A

RG1/TX2/CK2

RG2/RX2/DT2 RG3/CCP4/P3D RG5/MCLR RG4/CCP5/P1D

RF5/AN10/CV

RF2/AN7/C1OUT

/VPP

VSS VDD

RF7/SS1

RF6/AN11

REF

RF4/AN9 RF3/AN8

RE2/CS/P2B

RE3/P3C

RE4/P3B

RE5/P1C

RE6/P1B

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

17 18 19 20 21 22 23 24 25 26

AVSS

RF0/AN5

RF1/AN6/C2OUT

RA3/AN3/VREF+

RD0/PSP0

VDDVSS

RE7/ECCP2

PIC18F6527 PIC18F6622 PIC18F6627 PIC18F6722

REF-

RA2/AN2/V

RA1/AN1

RA0/AN0

RD1/PSP1

RD2/PSP2

RD3/PSP3

RD4/PSP4/SDO2

RD5/PSP5/SDI2/SDA2

54 53 52 5158 57 56 5560 5964 63 62 61

27 28 29 30 32

(1)

VDD

/P2A

(1)

RA4/T0CKI

RA5/AN4/HLVDIN

RC0/T1OSO/T13CKI

RD6/PSP6/SCK2/SCL2

50 49

RC6/TX1/CK1

RD7/PSP7/SS2

RC7/RX1/DT1

48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33

RB0/INT0 RB1/INT1 RB2/INT2 RB3/INT3 RB4/KBI0 RB5/KBI1/PGM RB6/KBI2/PGC

V OSC2/CLKO/RA6 OSC1/CLKI/RA7

V RB7/KBI3/PGD RC5/SDO1 RC4/SDI1/SDA1 RC3/SCK1/SCL1 RC2/ECCP1/P1A

RC1/T1OSI/ECCP2

Note 1: The ECCP2/P2A pin placement is determined by the CCP2MX configuration bit.

DS39646B-page 2 Preliminary  2004 Microchip Technology Inc.

Pin Diagrams (Continued)

80-Pin TQFP

PIC18F8722 FAMILY

(1)

/P2A

(1)

(2)

RE3/AD11/P3C

RE4/AD12/P3B

RE5/AD13/P1C

(2)

RE6/AD14/P1B

RE7/AD15/ECCP2

RD0/AD0/PSP0

VDDVSS

RD1/AD1/PSP1

RD2/AD2/PSP2

RD3/AD3/PSP3

RD4/AD4/PSP4/SDO2

RD5/AD5/PSP5/SDI2/SDA2

RD6/AD6/PSP6/SCK2/SCL2

RD7/AD7/PSP7/SS2

RJ0/ALE

RJ1/OE

(2)

RE2/AD10/CS/P2B

RH0/A16

RH1/A17

RH2/A18 RH3/A19

RE1/AD9/WR/P2C

RE0/AD8/RD

RG0/ECCP3/P3A

RG3/CCP4/P3D RG5/MCLR RG4/CCP5/P1D

RF5/AN10/CVREF

RF2/AN7/C1OUT RH7/AN15/P1B

RH6/AN14/P1C

/P2D

RG1/TX2/CK2 RG2/RX2/DT2

/VPP

V VDD

RF7/SS1

RF6/AN11

RF4/AN9 RF3/AN8

68 67 66 6572 71 70 6974 7378 77 76 757980

1 2

3 4 5 6 7 8 9

(2) (2)

10 11 12 13 14 15 16 17 18 19 20

21 22 23 24 25 26 27 28 29 30 31 32

(2)

RF0/AN5

RF1/AN6/C2OUT

RH5/AN13/P3B

RH4/AN12/P3C

AVSS

PIC18F8527 PIC18F8622 PIC18F8627 PIC18F8722

REF-

RA1/AN1

RA0/AN0

RA2/AN2/V

RA3/AN3/VREF+

33 34

VDD

RA5/AN4/HLVDIN

35 36

RA4/T0CKI

(1)

/P2A

(1)

64 63 62 61

RC6/TX1/CK1

RC7/RX1/DT1

RC0/T1OSO/T13CKI

RJ4/BA0

RJ5/CE

60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41

RJ2/WRL RJ3/WRH RB0/INT0 RB1/INT1 RB2/INT2 RB3/INT3/ECCP2 RB4/KBI0 RB5/KBI1/PGM RB6/KBI2/PGC V

OSC2/CLKO/RA6 OSC1/CLKI/RA7 V

RB7/KBI3/PGD RC5/SDO1 RC4/SDI1/SDA1 RC3/SCK1/SCL1 RC2/ECCP1/P1A RJ7/UB RJ6/LB

(1)

/P2A

(1)

RC1/T1OSI/ECCP2

Note 1: The ECCP2/P2A pin placement is determined by the CCP2MX configuration bit and Processor mode settings.

2: P1B, P1C, P3B and P3C pin placement is determined by the ECCPMX configuration bit.

 2004 Microchip Technology Inc. Preliminary DS39646B-page 3

PIC18F8722 FAMILY

1.0 Device Overview ..........................................................................................................................................................................7

2.0 Oscillator Configurations ............................................................................................................................................................ 31

3.0 Power-Managed Modes.......................................................... ....... .... .. .... .. .. ....... .... .. .. .... .. ......................................................... 41

4.0 Reset.......................................................................................................................................................................................... 49

5.0 Memory Organization................................................................................................................................................................. 63

6.0 Flash Prog ram Memory...................................... ..................... ..................... ..................... .........................................................87

7.0 External Memory Bus.................................................................................................................................................................97

8.0 Data EEPROM Mem o ry..................................... ..................... ..................... ..................... ....................................................... 111

9.0 8 x 8 Hardware Multiplier............................................................................................... ...........................................................117

10.0 Interrupts..................................................................................................................................................................................119

11.0 I/O Ports....... ..................... ..................... ..................... ............................................................................................................. 135

12.0 Timer0 Module ......................................................................................................................................................................... 161

13.0 Timer1 Module ......................................................................................................................................................................... 165

14.0 Timer2 Module ......................................................................................................................................................................... 171

15.0 Timer3 Module ......................................................................................................................................................................... 173

16.0 Timer4 Module ......................................................................................................................................................................... 177

17.0 Capture/Compare/PWM (CCP) Modules .................................................................................................................................179

18.0 Enhanced Capture/Compare/PWM (ECCP) Module................................................................................................................ 187

19.0 Master Synchronous Serial Port (MSSP) Module .................................................................................................................... 205

20.0 Enhanced Universal Synchronous Receiver Transmitter (EUSART).......................................................................................247

21.0 10-Bit Analog-to-Digital Converter (A/D) Module .....................................................................................................................271

22.0 Comparator Module...................................................................................... ....... .... .. .... ...........................................................281

23.0 Comparator Voltage Reference Module........................................... .... .. .... .. ....... .... .. .... .. ....... .... .. ............................................ 287

24.0 High/Low-Voltage Detect (HLVD).............................................................................................................................................291

25.0 Special Features of the CPU........................................................ ..................... ....................................................................... 297

26.0 Instruction Set Summary.......................................................................................................................................................... 321

27.0 Development Support............................................................................................................................................................... 371

28.0 Electrical Characteristics.......................................................................................................................................................... 377

29.0 DC and AC Characteristics Graphs and Tables....................................................................................................................... 421

30.0 Packaging Information..... .......................................... ..................... ..................... ..................................................................... 423

Appendix A: Revision History.............................................................................................................................................................427

Appendix B: Device Differences.........................................................................................................................................................427

Appendix C: Conversion Considerations .................................................................... .... .. .... .. .... ....................................................... 428

Appendix D: Migration From Baseline to Enhanced Devices............................................................................................................. 428

Appendix E: Migration From Mid-Range to Enhanced Devices......................................................................................................... 429

Appendix F: Migration From High-End to Enhanced Devices............................................................ .... .. .... .. ....................................429

Index .................................................................................................................................................................................................. 431

On-Line Support........................................................................ .. .... .. ......... .... .. .... ......... .. ................................................................... 443

Systems Information and Upgrade Hot Line...................................................................................................................................... 443

Reader Response.............................................................................................................................................................................. 444

PIC18F8722 Family Product Identification System............................................................................................................................445

DS39646B-page 4 Preliminary  2004 Microchip Technology Inc.

PIC18F8722 FAMILY

TO OUR VALUED CUSTOMERS

It is our intention to provide our valued customers with the best documentation possible to ensure successful use of your Microchip products. To this end, we will continue to improve our publications to better suit your needs. Our publications will be refined and enhanced as new volumes and updates are introduced.

If you have any questions or c omm ents regarding t his publication, p lease c ontact the M arket ing Co mmunications Department via E-mail at docerrors@.microchip.com or fax the Reader Response Form in the back of this data sheet to (480) 792-4150. We welcome your feedback.

Most Current Data Sheet

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You can determine the version of a data sheet by examining its literature number found on the bottom outside corner of any page. The last character of the literature number is the version number, (e.g., DS30000A is version A of document DS30000).

Errata

An errata sheet, describing minor operational differences from the data sheet and recommended workarounds, may exist for current devices. As device/documentation issues become known to us, we will publish an errata sheet. The errata will specify the revision of silicon and revision of document to which it applies.

To determine if an errata sheet exists for a particular device, please check with one of the following:

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• Your local Microchip sales office (see last page) When contacting a sales office, please specify which device, revision of silicon and data sheet (include literature number) you are

using.

Customer Notification System

 2004 Microchip Technology Inc. Preliminary DS39646B-page 5

PIC18F8722 FAMILY

NOTES:

DS39646B-page 6 Preliminary  2004 Microchip Technology Inc.

PIC18F8722 FAMILY

1.0 DEVICE OVERVIEW

This documen t conta i ns dev ic e spec if i c in for m at i on fo r the following devices:

• PIC18F6527 • PIC18LF6527

• PIC18F6622 • PIC18LF6622

• PIC18F6627 • PIC18LF6627

• PIC18F6722 • PIC18LF6722

• PIC18F8527 • PIC18LF8527

• PIC18F8622 • PIC18LF8622

• PIC18F8627 • PIC18LF8627

• PIC18F8722 • PIC18LF8722

This family offers the advantages of all PIC18 microcontrollers – namely, high computational performance at an economical price – with the addition of highendurance, Enhanced Flash program memory . On top of these features, the PIC18F8722 family introduces design enhancements that make these microcontrollers a logical choice for many high-performance, power sensitive applications.

1.1 New Core Features

1.1.1 nanoWatt TECHNOLOGY

All of the devices in the PIC18 F8722 fami ly incorp orate a range of features that can significantly reduce power consumption during operation. Key items include:

• Alternate Run Modes: By clocking the controller from the Timer1 source or the internal oscillator block, power consumption during code execution can be significantly redu ce d.

• Multiple Idle Modes: The controller can also run with its CPU core disabled but the peripherals still active. In these st ates, powe r consumpt ion can be reduced even further.

• On-the-fly Mode Switching: The powermanaged modes a re invo ked b y user code durin g operation, allowing the user to incorporate powersaving ideas into their application’s software design.

• Low Consumption in Key Modules: The power requirements for both Timer1 and the Watchdog Timer are minimized. See Section 28.0 “Electrical Characteristics” for values.

1.1.2 EXPANDED MEMORY

The PIC18F8722 family provides ample room for application code and includes members with 48, 64, 96 or 128 Kbytes of code space.

• Data RAM and Data EEPROM: The PIC18F872 2 family also p rov ide s ple nty o f room for application data. The devices have 3936 bytes of data RAM, as well as 1024 bytes of data EEPROM, for long term retention of nonvolatile data.

• Memory Endurance: The Enhanced Flash cells for both program memory and data EEPROM are rated to last for many thousands of erase/write cycles, up to 100,000 for program memory and 1,000,000 for EEPROM. Data retention without refresh is conservatively estimated to be greater than 40 years.

1.1.3 MULTIPLE OSCILLATOR OPTIONS

AND FEATURES

All of the devices in the PIC18F8722 family offer ten different osci llator opt ions, all owin g users a w ide range of choices in developing application hardware. These include:

• Four Crystal modes, using crystals or ceramic resonators

• Two External Clock modes, offering the option of using two pins (oscillator input and a divide-by-4 clock output) or one pin (oscillator input, with the second pin reassigned as general I/O)

• Two External RC Oscillator modes with the same pin options as the External Clock modes

• An internal oscillator block which provides an 8 MHz clock and an INTRC source (approximately 31 kHz), as well as a range of 6 user selectable cl ock fre quenc ies, be tween 125 kHz to 4 MHz, for a total of 8 clock frequencies. This option frees the two oscillator pins for use as additional general purpose I/O.

• A Phase Lock Loop (PLL) frequency multiplier, available to both the high-speed crystal and in ternal oscillator m odes, which a llows clo ck speeds o f up to 40 MHz. Used with the internal oscill ator , the PLL gives users a complete selection of clock speeds, from 31 kHz to 32 MHz – all without usin g an external crystal or clock circuit.

 2004 Microchip Technology Inc. Preliminary DS39646B-page 7

PIC18F8722 FAMILY

Besides its availability as a clock source, the internal oscillator block provides a stable reference source that gives the family additional features for robust operation:

• Fail-Safe Clock M o nito r: Thi s optio n cons ta ntly monitors the m ai n c l oc k so urce against a reference signal provide d by th e internal oscillator. If a clock failure occu rs , t he co nt rol le r i s s witc h ed to th e internal oscillator block, allowing for continued low-speed operation or a safe application shutdown.

• Two-Speed Start-up: This option allows the internal oscillator to serve as the clock source from Power-on Reset, or wake-up from Sleep mode, until the primary clock source is available.

1.1.4 EXTERNAL MEMORY INTERFACE

In the unlikely event that 128 Kbytes of program memory is inadequate for an application, the PIC18F8527/8622/8627/8722 members of the family also implement an external memory interface. This allows the controller’s internal program counter to address a memory space of up to 2 Mbytes, permitting a level of data access that few 8-bit devices can claim.

With the addition of new operat ing mod es, the ext erna l memory interface offers many new options, including:

• Operating the microcontrol le r entirely from external memory

• Using combinations of on-chip and external memory, up to the 2-Mbyte limit

• Using external Flash memory for reprogrammable application code or large data tables

• Using external RAM devices for storing large amounts of variable data

1.1.5 EASY MIGRATION

Regardless of the memory size, all devices share the same rich set of peripherals, allowing for a smooth migration path as applications grow and evolve.

The consistent pinout scheme used throughout the entire family also aids in migrating to the next larger device. Thi s is true when movi ng between the 64-pin members, between the 80-pin members, or even jumping from 64-pin to 80 -pin devices.

1.2 Other Special Features

• Communications: The PIC18F8722 family incorporates a range of serial communication peripherals, including 2 independent Enhanced USARTs and 2 Master SSP modules capable of both SPI and I operation. Also, one of the general purpose I/O ports can be reconfigured as an 8-bit Parallel Slave Port for direct processor-to-processor communications.

• CCP Modules: All devices in the family incorporate two Capture/Compare/PWM (CCP) modules and three Enhanced CCP (ECCP) modules to maximize flexibility in control applications. Up to four different time bases may be used to perform severa l di f fe rent operations at once. Each of the three ECCP modul es offer up to four PWM outputs, allowing for a total of 12 PWMs. The ECCPs also offer many beneficial features, including polarity selection, Programmable Dead-Time, Auto-Shutdown and Restart and Half-Bridge and Full-Bridge Output modes.

• Self-Programmability: These devices can write to their own program memory spaces under internal software control. By using a bootloader routine located in the protected Boot Block at the top of program memory, it becomes possible to create an application that can update itself in the field.

• Extended Instruction Set: The PIC18F8722 family introduces an optional extension to the PIC18 instruction set, which adds 8 new instructions and an Indexed Addressing mode. This extension, enabled as a device configuration option, has been specifi cally des igned to opti mize re-entrant applica tion code original ly deve loped in high-level language s, su ch as C.

• 10-bit A/D Converter: This module incorporates programmable acquisition time, allowing for a channel to be selected and a conversion to be initiated without w ait ing for a sampling period and thus, reduce code overhead.

• Extended Watchdog Timer (WDT): This enhanced version in corpora tes a 16 -bit pre scale r, allowing an exte nded time-o ut rang e that is s ta ble across operating voltage and temperature. See Section 28.0 “Electrical Characteristics” for time-out periods.

C (Master and Slave) modes of

DS39646B-page 8 Preliminary  2004 Microchip Technology Inc.

PIC18F8722 FAMILY

1.3 Details on Individual Family Members

Devices in the PIC18F8722 family are available in 64-pin and 80-pin packages. Block diagrams for the two groups are shown in Figure 1-1 and Figure 1-2.

The devices are differentiated from each other in five ways:

1. Flash program memory (48 Kbytes for

PIC18F6527/8527 devices, 64 Kbytes for PIC18F6622/8622 devices, 96 Kbytes for PIC18F6627/8627 devices and 128 Kbytes for

All other features fo r device s in this family are identi cal. These are summarized in Table 1-2 and Table 1-2.

The pinouts for all devices are listed in Table 1-3 and Table 1-4.

Like all Microchip PIC18 devices, members of the PIC18F8722 family are av ail ab le a s b oth s t a ndard and low-voltage devices. Standard devices with Enhanced Flash memory, designated with an “F” in the part number (such as PIC18F6627), accommodate an operating V

DD range of 4.2V to 5.5V. Low-voltage

parts, designated by “LF” (such as PIC18LF6627), function over an extended VDD range of 2.0V to 5.5V.

PIC18F6722/8722).

2. A/D channels (12 for 64-pin devices, 16 for

80-pin devices).

3. I/O ports (7 bidirectional por ts on 64-pin de vices,

9 bidirectional ports on 80-pin devices).

4. External Memory Bus, configurable for 8 and

16-bit operation, is available on PIC18F8527/ 8622/8627/8722 devices.

T ABLE 1-1: DEVICE FEATURES (PIC18F6527/6622/6627/6722)

Features PIC18F6527 PIC18F6622 PIC18F6627 PIC18F6722

Operating Frequency DC – 40 MHz DC – 40 MHz DC – 40 MHz DC – 40 MHz Program Memory (Bytes) 48K 64K 96K 128K Program Memory (Instructions) 24576 32768 49152 65536 Data Memory (Bytes) 3936 3936 3936 3936 Data EEPROM Memory (Bytes) 1024 1024 1024 1024 Interrupt Sources 28282828 I/O Ports Ports A, B, C, D, E, F, G Ports A, B, C, D, E, F, G Ports A, B, C, D, E, F, G Ports A, B, C, D, E, F, G Timers 5 5 5 5 Capture/Compare/PWM

Modules Enhanced Capture/Compare/

PWM Modules Enhanced USART 2 2 2 2 Serial Communications MSSP,

Parallel Communications (PSP) Y es Y es Ye s Yes 10-bit Analog-to-Digit al Modul e 12 Input Channels 12 Input Channels 12 In put Cha nnel s 12 Input Chann els Resets (and Delays) POR, BOR,

Underflow (PWRT , OST),

MCLR

Programmable High/Low-Voltage Detect

Programmable Brown-out Reset

Instruction Set 75 Instructio ns;

Instruction Set enabled

Packages 64-pin TQFP 64-pin TQFP 64-pin TQFP 64-pin TQFP

2222

3333

MSSP,

Enhanced USART

RESET Instruction,

Stack Full, Stack

(optional), WDT

Yes Yes Yes Yes

83 with Extended

Enhanced USART

POR, BOR,

RESET Instruction,

Stack Full, Stack

Underflow (PWRT, OST),

MCLR (optional), WDT

75 Instructions;

83 with Exten ded

Instruction Set enabled

Underflow (PWRT , OST),

MSSP,

Enhanced USART

POR, BOR,

RESET Instruction,

Stack Full, Stack

MCLR (optional), WDT

75 Instructions;

83 with Extended

Instruction Set enabled

MSSP,

Enhanced USART

POR, BOR,

RESET Instruction,

Stack Full, Stack

Underflow (PWRT, OST),

MCLR (optional), WDT

75 Instructions;

83 with Extended

Instruction Set enabled

 2004 Microchip Technology Inc. Preliminary DS39646B-page 9

PIC18F8722 FAMILY

TABLE 1-2: DEVICE FEATURES (PIC18F8527/8622/8627/8722)

Features PI C18 F8 527 PIC18F8622 PIC18F8627 PIC18F8722

Operating Frequency DC – 40 MHz DC – 40 MHz DC – 40 MHz DC – 40 MHz Program Memory (Bytes) 48K 64K 96K 128K Program Memory (Instructions) 24576 32768 49152 65536 Data Memory (Bytes) 3936 3936 3936 3936 Data EEPROM Memo ry (Byte s) 1024 1024 1024 1024 Interrup t Sou r ce s 29 29 29 29 I/O Ports Ports A, B, C, D, E,

F, G, H, J Timers 5 5 5 5 Capture/Compare/PWM

Modules Enhanced Capture/Comp are/

PWM Modules Enhanced USART 2 2 2 2 Serial Communications MSSP ,

Enhanced USART

Parallel Communications (PSP)

10-bit Analog-to-Digit al Modul e 16 Input Channels 16 Input Chann els 16 Input Channels 16 Input Channels Resets (and Delays) POR, BOR,

Underflow (PWRT , OST),

MCLR

Programmable High/Low-Voltage Detect

Programmable Brown-out Reset

Instruction Set 75 Instructions;

Instruction Set enabled

Packages 80-pin TQFP 80-pin TQFP 80-pin TQFP 80-pin TQFP

2222

3333

Yes Yes Yes Yes

RESET Instruction,

Stack Full, Stack

(optional), WDT

Yes Yes Yes Yes

83 with Extended

Ports A, B, C, D, E,

F, G, H, J

MSSP,

Enhanced USART

POR, BOR,

RESET Instruction,

Stack Full, Stack

Underflow (PWRT, OST),

MCLR (optional), WDT

75 Instructions;

83 with Extended

Instruction Set enabled

Ports A, B, C, D, E,

F, G, H, J

MSSP,

Enhanced USART

POR, BOR,

RESET Instruction,

Stack Full, Stack

Underflow (PWRT , OST),

MCLR (optional), WDT

75 Instructions;

83 with Extended

Instruction Set e nabled

Ports A, B, C, D, E,

F, G, H, J

MSSP,

Enhanced USART

POR, BOR,

RESET Instruction,

Stack Full, Stack

Underflow (PWRT, OST),

MCLR (optional), WDT

75 Instructions;

83 with Extended

Instruction Set enabled

DS39646B-page 10 Preliminary  2004 Microchip Technology Inc.

PIC18F8722 FAMILY

FIGURE 1-1: PIC18F6527/6622/6627/6722 (64-PIN) BLOCK DIAGRAM

T able Pointer<21>

inc/dec logic

Address Latch

Program Memory

(48/64/96/128

Kbytes)

Data Latch

Instruction Bus <16>

(3)

OSC1

(3)

OSC2

T1OSI

T1OSO

(2)

MCLR

VDD,

Table Latch

ROM Latch

Instruction

Decode and

Control

Internal

Oscillator

Block

INTRC

Oscillator

8 MHz

Oscillator

Single-Supply Programming

In-Circuit

Debugger

PCLATH

PCLATU

PCH PCL

PCU

Program Counter

31 Level Stack

STKPTR

State Machine Control Signals

Power-up

Oscillator

Start-up Timer

Power-on

Watchdog

Brown-out

Fail-Safe

Clock Monitor

Data Bus<8>

Timer

Reset

Timer

Reset

Data Memory

Address Latch

Data Address< 12>

BSR

inc/dec

Address Decode

BITOP

Precision

Band Gap

Reference

Data Latch

(3.9Kbytes)

FSR0 FSR1 FSR2

logic

8 x 8 Multiply

ALU<8>

Access

Bank

PRODLPRODH

PORTA

(1)

RA0:RA7

PORTB

(1)

RB0:RB7

PORTC

RC0:RC7

(1)

PORTD

RD0:RD7

(1)

PORTE

(1)

RE0:RE7

PORTF

RF0:RF7

(1)

PORTG

RG0:RG5

(1)

BOR

HLVD

ECCP1

ADC

10-bit

ECCP2

ECCP3

Timer2Timer1 Timer3Timer0

EUSART1

Timer4

EUSART2

Comparators

MSSP1

MSSP2CCP4 CCP5

Note 1: See Table 1-3 for I/O port pin descriptions.

2: RG5 is only available when M

CLR functionality is disabled.

3: OSC1/CLKI and OSC2/CLKO are only available in select oscillator modes and when these pins are not being used as

digital I/O. Refer to Section 2.0 “Oscillator Configurations” for additional information.

 2004 Microchip Technology Inc. Preliminary DS39646B-page 11

PIC18F8722 FAMILY

FIGURE 1-2: PIC18F8527/8622/8627/8722 (80-PI N) BLOC K DIAGRAM

Data Bus<8>

T able Pointer<21>

inc/dec logic

Address Latch

Program Memory

(48/64/96/ 128

Data Latch

System Bus Interface

Instruction Bus <16>

AD15:AD0, A19:A16 (Multiplexed with PORTD, PORTE and PORTH)

(3)

OSC1

(3)

OSC2

T1OSI

T1OSO

(2)

MCLR

VDD,

Kbytes)

State Machine Control Signals

Internal

Oscillator

Block

INTRC

Oscillator

8 MHz

Oscillator

Single-Supply Programming

In-Circuit

Debugger

PCLATH

PCLATU

PCH PCL

PCU

Program Counter

31 Level Stack

STKPTR

T able Latch

ROM Latch

Instruction

Decode &

Control

Start-up Timer

Clock Monitor

Power-up

Timer

Oscillator

Power-on

Reset

Watchdog

Timer

Brown-out

Reset

Fail-Safe

Data Latch

PORTA

RA0:RA7

(1)

Data Memory

(3.9 Kbytes)

Address Lat ch

PORTB

RB0:RB7

(1)

Data Address<12>

4124

BSR

FSR0 FSR1 FSR2

inc/dec

logic

Address Decode

Access

Bank

PORTC

RC0:RC7

PORTD

RD0:RD7

(1)

PORTE

(1)

RE0:RE7

PORTF

RF0:RF7

PORTG

RG0:RG5

PORTH

RH0:RH7

PORTJ

RJ0:RJ7

(1)

BITOP

Precision

Band Gap

Reference

PRODLPRODH

8 x 8 Multiply

ALU<8>

BOR

HLVD

ECCP1

ADC

10-bit

ECCP2 ECCP3

Timer2Timer1 Timer3Timer0

EUSART1

Timer4

EUSART2

Comparators

MSSP1

MSSP2CCP4 CCP5

Note 1: See Table 1-4 for I/O port pin descriptions.

2: RG5 is only available when MCLR

functionality is disabled.

3: OSC1/CLKI and OS C2/CLKO are only availabl e in sele ct oscillator modes and when these pins are not being used as

digital I/O. Refer to Section 2.0 “Oscillator Configurations” for additional information.

DS39646B-page 12 Preliminary  2004 Microchip Technology Inc.

PIC18F8722 FAMILY

T ABLE 1-3: PIC18F6527/6622/6627/6722 PINOUT I/O DESCRIPTIONS

Pin Name

Pin Number

TQFP

Type

Buffer

Type

Description

RG5/MCLR

RG5 MCLR

VPP

OSC1/CLKI/RA7

OSC1

CLKI

RA7

OSC2/CLKO/RA6

OSC2 CLKO

RA6

Legend: TTL = TTL compatible input CMOS = CMOS compatible input or output

Note 1: Default assignment for EC CP2 when configuration bit CCP2MX is set.

/VPP

ST = Schmitt Trigger input with CMOS levels Analog = Analog input I = Input O = Output P= Power I

2: Alternate assignment for ECCP2 when configuration bit CCP2MX is cleared.

I I

CMOS

I/O

O O

I/O

Master Clear (input) or programming voltage (input). ST ST

TTL

— —

TTL

Digital input. Master Clear (Reset) input. This pin is an active-low Reset to the device. Programming voltage input.

Oscillator crystal or external clock input.

Oscillator crystal input or external clock source input. ST buffer when configured in RC mode, CMOS otherwise. External clock source inpu t. Always asso ciated with pin function OSC1. (See related OSC1/CLKI, OSC2/CLKO pins.) General purpose I/O pin.

Oscillator crystal or clock output.

Oscillator crystal output. Connects to crystal or resonator in Crystal Oscillator mode. In RC mode, OSC2 pin outputs CLKO, which has 1/4 the frequency of OSC1 and denotes the instruction cycle rate. General purpose I/O pin.

C™ = I2C/SMBus input buffer

 2004 Microchip Technology Inc. Preliminary DS39646B-page 13

PIC18F8722 FAMILY

TABLE 1-3: PIC18F6527/6622/6627/6722 PINOUT I/O DESCRIPTIONS (CONTINUED)

Pin Name

Pin Number

TQFP

Type

Buffer

Type

Description

PORTA is a bidirectional I/O port.

RA0/AN0

RA0 AN0

RA1/AN1

RA1 AN1

RA2/AN2/V

RA2 AN2 V

RA3/AN3/V

RA3 AN3 V

RA4/T0CKI

RA4 T0CKI

RA5/AN4/HLVDIN

RA5 AN4

HLVDIN RA6 See the OSC2/CLKO/RA6 pin. RA7 See the OSC1/CLKI/RA7 pin.

Legend: TTL = TTL compatible input CMOS = CMOS compatible input or output

Note 1: Default assignment for EC CP2 when configuration bit CCP2MX is set.

REF-

REF+

ST = Schmitt Trigger input with CMOS levels Analog = Analog input I = Input O = Output P= Power I

2: Alternate assignment for ECCP2 when configuration bit CCP2MX is cleared.

I/O

TTL

Analog

TTL

Analog

TTL

Analog

TTL

Analog

I I

TTL Analog Analog

Digital I/O. Analog input 0.

Digital I/O. Analog input 1.

Digital I/O. Analog input 2. A/D reference voltage (low) input.

Digital I/O. Analog input 3. A/D reference voltage (high) input.

Digital I/O. Timer0 external clock input.

Digital I/O. Analog input 4. High/Low-Voltage Detect input.

C™ = I2C/SMBus input buffer

DS39646B-page 14 Preliminary  2004 Microchip Technology Inc.

PIC18F8722 FAMILY

T ABLE 1-3: PIC18F6527/6622/6627/6722 PINOUT I/O DESCRIPTIONS (CONTINUED)

Pin Name

RB0/INT0/FLT0

RB0 INT0 FLT0

Pin Number

TQFP

Type

I/O

I I

Buffer

Type

TTL

ST ST

Description

PORTB is a bidirectional I/O port. PORTB can be software programmed for intern al weak pull-ups on all inputs.

Digital I/O. External interrupt 0. PWM Fault input for ECCPx.

RB1/INT1

RB1 INT1

RB2/INT2

RB2 INT2

RB3/INT3

RB3 INT3

RB4/KBI0

RB4 KBI0

RB5/KBI1/PGM

RB5 KBI1 PGM

RB6/KBI2/PGC

RB6 KBI2 PGC

RB7/KBI3/PGD

RB7 KBI3 PGD

Legend: TTL = TTL compatible input CMOS = CMOS compatible input or output

ST = Schmitt Trigger input with CMOS levels Analog = Analog input I = Input O = Output P= Power I

Note 1: Default assignment for EC CP2 when configuration bit CCP2MX is set.

2: Alternate assignment for ECCP2 when configuration bit CCP2MX is cleared.

I/O

I/O I/O

TTL

TTL TTL

Digital I/O. External interrupt 1.

Digital I/O. External interrupt 2.

Digital I/O. External interrupt 3.

Digital I/O. Interrupt-on-change pin.

Digital I/O. Interrupt-on-change pin. Low-Voltage ICSP™ Programming enable pin.

Digital I/O. Interrupt-on-change pin. In-Circuit Debugger and ICSP programming clock pin.

Digital I/O. Interrupt-on-change pin. In-Circuit Debugger and ICSP programming data pin.

C™ = I2C/SMBus input buffer

 2004 Microchip Technology Inc. Preliminary DS39646B-page 15

PIC18F8722 FAMILY

TABLE 1-3: PIC18F6527/6622/6627/6722 PINOUT I/O DESCRIPTIONS (CONTINUED)

Pin Name

Pin Number

TQFP

Type

Buffer

Type

Description

PORTC is a bidirectional I/O port.

RC0/T1OSO/T13CKI

RC0 T1OSO T13CKI

RC1/T1OSI/ECCP2/P2A

RC1 T1OSI

(1)

ECCP2

(1)

P2A

RC2/ECCP1/P1A

RC2 ECCP1

P1A

RC3/SCK1/SCL1

RC3 SCK1 SCL1

RC4/SDI1/SDA1

RC4 SDI1 SDA1

RC5/SDO1

RC5 SDO1

I/O

I/O I/O

I/O I/O I/O

I/O I/O

I/O

—

CMOS

—

ST ST

—

ST ST ST

—

Digital I/O. Timer1 oscillator output. Timer1/Timer3 external clock input.

Digital I/O. Timer1 oscillator input. Enhanced Capture 2 input/Compare 2 output/ PWM 2 output. ECCP2 PWM output A.

Digital I/O. Enhanced Capture 1 input/Compare 1 output/ PWM 1 output. ECCP1 PWM output A.

Digital I/O. Synchronous serial clock input/output for SPI™ mode. Synchron ous serial cl ock input/output for I

Digital I/O. SPI data in.

C data I/O.

Digital I/O. SPI data out.

C™ mode.

RC6/TX1/CK1

RC6 TX1 CK1

RC7/RX1/DT1

RC7 RX1 DT1

Legend: TTL = TTL compatible input CMOS = CMOS compatible input or output

ST = Schmitt Trigger input with CMOS levels Analog = Analog input I = Input O = Output P= Power I

Note 1: Default assignment for EC CP2 when configuration bit CCP2MX is set.

2: Alternate assignment for ECCP2 when configuration bit CCP2MX is cleared.

I/O

I/O I/O

—

ST ST

Digital I/O. EUSART1 asynchronous transmit. EUSART1 synchronous clock (see related RX1/DT1).

Digital I/O. EUSART1 asynchronous receive. EUSART1 synchronous data (see related TX1/CK1).

C™ = I2C/SMBus input buffer

DS39646B-page 16 Preliminary  2004 Microchip Technology Inc.

PIC18F8722 FAMILY

T ABLE 1-3: PIC18F6527/6622/6627/6722 PINOUT I/O DESCRIPTIONS (CONTINUED)

Pin Name

Pin Number

TQFP

Type

Buffer

Type

Description

PORTD is a bidirectional I/O port.

RD0/PSP0

RD0 PSP0

RD1/PSP1

RD1 PSP1

RD2/PSP2

RD2 PSP2

RD3/PSP3

RD3 PSP3

RD4/PSP4/SDO2

RD4 PSP4 SDO2

RD5/PSP5/SDI2/SDA2

RD5 PSP5 SDI2 SDA2

RD6/PSP6/SCK2/SCL2

RD6 PSP6 SCK2 SCL2

I/O I/O

I/O

I/O I/O I/O I/O

TTL

—

TTL

C/SMB

TTL

C/SMB

Digital I/O. Parallel Slave Port data.

Digital I/O. Parallel Slave Port data. SPI data out.

Digital I/O. Parallel Slave Port data. SPI™ data in. I2C™ data I/O.

Digital I/O. Parallel Slave Port data. Synchronous serial clock input/output for SPI mode. Synchronous serial clock input/output for I2C mode.

RD7/PSP7/SS2

RD7 PSP7 SS2

Legend: TTL = TTL compatible input CMOS = CMOS compatible input or output

ST = Schmitt Trigger input with CMOS levels Analog = Analog input I = Input O = Output P= Power I

Note 1: Default assignment for EC CP2 when configuration bit CCP2MX is set.

2: Alternate assignment for ECCP2 when configuration bit CCP2MX is cleared.

 2004 Microchip Technology Inc. Preliminary DS39646B-page 17

I/O I/O

TTL

Digital I/O. Parallel Slave Port data. SPI slave select input.

C™ = I2C/SMBus input buffer

PIC18F8722 FAMILY

TABLE 1-3: PIC18F6527/6622/6627/6722 PINOUT I/O DESCRIPTIONS (CONTINUED)

Pin Name

Pin Number

TQFP

Type

Buffer

Type

Description

PORTE is a bidirectional I/O port.

RE0/RD

RE0 RD P2D

RE1/WR

RE1 WR P2C

RE2/CS

RE2 CS P2B

RE3/P3C

RE3 P3C

RE4/P3B

RE4 P3B

RE5/P1C

RE5 P1C

RE6/P1B

RE6 P1B

/P2D

/P2C

/P2B

I/O

TTL

—

TTL

—

TTL

—

Digital I/O. Read control for Parallel Slave Port. ECCP2 PWM output D.

Digital I/O. Write control for Parallel Slave Port. ECCP2 PWM output C.

Digital I/O. Chip select control for Parallel Slave Port. ECCP2 PWM output B.

Digital I/O. ECCP3 PWM output C.

Digital I/O. ECCP3 PWM output B.

Digital I/O. ECCP1 PWM output C.

Digital I/O. ECCP1 PWM output B.

RE7/ECCP2/P2A

RE7

(2)

ECCP2

(2)

P2A

Legend: TTL = TTL compatible input CMOS = CMOS compatible input or output

ST = Schmitt Trigger input with CMOS levels Analog = Analog input I = Input O = Output P= Power I

Note 1: Default assignment for EC CP2 when configuration bit CCP2MX is set.

2: Alternate assignment for ECCP2 when configuration bit CCP2MX is cleared.

I/O I/O

ST ST

—

Digital I/O. Enhanced Capture 2 input/Compare 2 output/ PWM 2 output. ECCP2 PWM output A.

C™ = I2C/SMBus input buffer

DS39646B-page 18 Preliminary  2004 Microchip Technology Inc.

PIC18F8722 FAMILY

T ABLE 1-3: PIC18F6527/6622/6627/6722 PINOUT I/O DESCRIPTIONS (CONTINUED)

Pin Name

Pin Number

TQFP

Type

Buffer

Type

Description

PORTF is a bidirectional I/O port.

RF0/AN5

RF0 AN5

RF1/AN6/C2OUT

RF1 AN6 C2OUT

RF2/AN7/C1OUT

RF2 AN7 C1OUT

RF3/AN8

RF3 AN8

RF4/AN9

RF4 AN9

RF5/AN10/CV

RF5 AN10 CVREF

RF6/AN11

RF6 AN11

REF

I/O

Analog

—

Analog

—

Analog

Analog Analog

Analog

Digital I/O. Analog input 5.

Digital I/O. Analog input 6. Comparator 2 output.

Digital I/O. Analog input 7. Comparator 1 output.

Digital I/O. Analog input 8.

Digital I/O. Analog input 9.

Digital I/O. Analog input 10. Comparator reference voltage output.

Digital I/O. Analog input 11.

RF7/SS

Legend: TTL = TTL compatible input CMOS = CMOS compatible input or output

Note 1: Default assignment for EC CP2 when configuration bit CCP2MX is set.

RF7

ST = Schmitt Trigger input with CMOS levels Analog = Analog input I = Input O = Output P= Power I

2: Alternate assignment for ECCP2 when configuration bit CCP2MX is cleared.

I/O

TTL

Digital I/O. SPI™ slave select input.

C™ = I2C/SMBus input buffer

 2004 Microchip Technology Inc. Preliminary DS39646B-page 19

PIC18F8722 FAMILY

TABLE 1-3: PIC18F6527/6622/6627/6722 PINOUT I/O DESCRIPTIONS (CONTINUED)

Pin Name

Pin Number

TQFP

Type

Buffer

Type

Description

PORTG is a bidirectional I/O port.

RG0/ECCP3/P3A

RG0 ECCP3

P3A

RG1/TX2/CK2

RG1 TX2 CK2

RG2/RX2/DT2

RG2 RX2 DT2

RG3/CCP4/P3D

RG3 CCP4 P3D

RG4/CCP5/P1D

RG4 CCP5 P1D

RG5 See RG5/MCLR

SS 9, 25, 41, 56 P — Ground reference for logic and I/O pins.

V VDD 10, 26, 38, 57 P — Positive supply for logic and I/O pins. AVSS 20 P — Ground reference for analog modules.

DD 19 P — Positive supply for analog modules.

AV Legend: TTL = TTL compatible input CMOS = CMOS compatible input or output

ST = Schmitt Trigger input with CMOS levels Analog = Analog input I = Input O = Output P= Power I

Note 1: Default assignment for EC CP2 when configuration bit CCP2MX is set.

2: Alternate assignment for ECCP2 when configuration bit CCP2MX is cleared.

I/O I/O

I/O

I/O I/O

ST ST

—

ST ST ST

ST ST

—

ST ST

—

Digital I/O. Enhanced Capture 3 input/Compare 3 output/ PWM 3 output. ECCP3 PWM output A.

Digital I/O. EUSART2 asynchronous transmit. EUSART2 synchronous clock (see related RX2/DT2).

Digital I/O. EUSART2 asynchronous receive. EUSART2 synchronous data (see related TX2/CK2).

Digital I/O. Capture 4 input/Compare 4 output/PWM 4 output. ECCP3 PWM output D.

Digital I/O. Capture 5 input/Compare 5 output/PWM 5 output. ECCP1 PWM output D.

/VPP pin.

C™ = I2C/SMBus input buffer

DS39646B-page 20 Preliminary  2004 Microchip Technology Inc.

PIC18F8722 FAMILY

T ABLE 1-4: PIC18F8527/8622/8627/8722 PINOUT I/O DESCRIPTIONS

Pin Name

Pin Number

TQFP

Type

Buffer

Type

Description

RG5/MCLR

RG5 MCLR

VPP

OSC1/CLKI/RA7

OSC1

CLKI

RA7

OSC2/CLKO/RA6

OSC2 CLKO

RA6

Legend: TTL = TTL compatible input CMOS = CMOS compatible input or output

Note 1: Alternate assignment for ECCP2 when configuration bit CCP2MX is cleared (all operating modes except

/VPP

ST = Schmitt Trigger input with CMOS levels Analog = Analog input I = Input O = Output P= Power I

Microcontroller mode).

2: Default assignment for ECCP2 in all operating modes (CCP2MX is set). 3: Alternate assignment for ECCP2 when CCP2MX is cleared (Microcontroller mode only). 4: Default assignment for P1B/P1C/P3B/P3C (ECCPMX is set). 5: Alternate assignment for P1B/P1C/P3B/P3C (ECCPMX is clear).

I/O

O O

I/O

Master Clear (input) or programming voltage (input). I I

ST ST

CMOS

TTL

— —

TTL

Digital input. Master Clear (Reset) input. This pin is an active-low Reset to the device. Programming voltage input.

Oscillator crystal or external clock input.

Oscillator crystal input or external clock source input. ST buffer when configured in RC mode, CMOS otherwise. External clock source input. Always associated with pin function OSC1. (See related OSC1/CLKI, OSC2/CLKO pins.) General purpose I/O pin.

Oscillator cryst al or clock output.

C™/SMB = I2C/SMBus input buffer

 2004 Microchip Technology Inc. Preliminary DS39646B-page 21

PIC18F8722 FAMILY

TABLE 1-4: PIC18F8527/8622/8627/8722 PINOUT I/O DESCRIPTIONS (CONTINUED)

Pin Name

Pin Number

TQFP

Type

Buffer

Type

Description

PORTA is a bidirectional I/O port.

RA0/AN0

RA0 AN0

RA1/AN1

RA1 AN1

RA2/AN2/V

RA2 AN2 V

RA3/AN3/V

RA3 AN3 V

RA4/T0CKI

RA4 T0CKI

RA5/AN4/HLVDIN

RA5 AN4

HLVDIN RA6 See the OSC2/CLKO/RA6 pin. RA7 See the OSC1/CLKI/RA7 pin.

Legend: TTL = TTL compatible input CMOS = CMOS compatible input or output

Note 1: Alternate assignment for ECCP2 when configuration bit CCP2MX is cleared (all operating modes except

REF-

REF+

ST = Schmitt Trigger input with CMOS levels Analog = Analog input I = Input O = Output P= Power I

Microcontroller mode).

I/O

I/OIST/ODSTDigital I/O. Open-drain when configured as output.

I/O

TTL

Analog

TTL

Analog

TTL

Analog

TTL

Analog

TTL

Analog

Digital I/O. Analog input 0.

Digital I/O. Analog input 1.

Digital I/O. Analog input 2. A/D reference voltage (low) input.

Digital I/O. Analog input 3. A/D reference voltage (high) input.

Timer0 external clock input.

Digital I/O. Analog input 4. High/Low-Voltage Detect input.

C™/SMB = I2C/SMBus input buffer

DS39646B-page 22 Preliminary  2004 Microchip Technology Inc.

PIC18F8722 FAMILY

T ABLE 1-4: PIC18F8527/8622/8627/8722 PINOUT I/O DESCRIPTIONS (CONTINUED)

Pin Name

RB0/INT0/FLT0

RB0 INT0 FLT0

Pin Number

TQFP

Type

I/O

I I

Buffer

Type

TTL

ST ST

Description

PORTB is a bidirectional I/O port. PORTB can be software programmed for internal weak pull-ups on all inputs.

Digital I/O. External interrupt 0. PWM Fault input for ECCPx.

RB1/INT1

RB1 INT1

RB2/INT2

RB2 INT2

RB3/INT3/ECCP2/P2A

RB3 INT3

(1)

ECCP2

(1)

P2A

RB4/KBI0

RB4 KBI0

RB5/KBI1/PGM

RB5 KBI1 PGM

RB6/KBI2/PGC

RB6 KBI2 PGC

RB7/KBI3/PGD

RB7 KBI3 PGD

Legend: TTL = TTL compatible input CMOS = CMOS compatible input or output

ST = Schmitt Trigger input with CMOS levels Analog = Analog input I = Input O = Output P= Power I

Note 1: Alternate assignment for ECCP2 when configuration bit CCP2MX is cleared (all operating modes except

Microcontroller mode).

I/O

O O

I/O

I/O I/O

TTL

— —

TTL TTL

Digital I/O. External interrupt 1.

Digital I/O. External interrupt 2.

Digital I/O. External interrupt 3. Enhanced Capture 2 input/Compare 2 output/ PWM 2 output. ECCP2 PWM output A.

Digital I/O. Interrupt-on-change pin.

Digital I/O. Interrupt-on-change pin. Low-V o lt ag e ICSP™ Prog ram ming ena ble pin.

Digital I/O. Interrupt-on-change pin. In-Circuit Debugger and ICSP™ programming clock pin.

Digital I/O. Interrupt-on-change pin. In-Circuit Debugger and ICSP programming data pin.

C™/SMB = I2C/SMBus input buffer

 2004 Microchip Technology Inc. Preliminary DS39646B-page 23

PIC18F8722 FAMILY

TABLE 1-4: PIC18F8527/8622/8627/8722 PINOUT I/O DESCRIPTIONS (CONTINUED)

Pin Name

Pin Number

TQFP

Type

Buffer

Type

Description

PORTC is a bidirectional I/O port.

RC0/T1OSO/T13CKI

RC0

T1OSO

T13CKI RC1/T1OSI/ECCP2/P2A

RC1

T1OSI

(2)

ECCP2

(2)

P2A RC2/ECCP1/P1A

RC2

ECCP1

P1A RC3/SCK1/SCL1

RC3

SCK1

SCL1 RC4/SDI1/SDA1

RC4

SDI1

SDA1 RC5/SDO1

RC5

SDO1 RC6/TX1/CK1

RC6

TX1

CK1

I/O

I/O I/O

I/O I/O I/O

I/O I/O

I/O

—

CMOS

—

ST ST

—

ST ST ST

—

Digital I/O. Timer1 oscillator output. Timer1/Timer3 external clock input.

Digital I/O. Timer1 oscillator input. Enhanced Capture 2 input/Compare 2 output/ PWM 2 output. ECCP2 PWM output A.

Digital I/O. Enhanced Capture 1 input/Compare 1 output/ PWM 1 output. ECCP1 PWM output A.

Digital I/O. Synchronous serial clock input/output for SPI™ mode. Synchronous serial clock input/output for I

Digital I/O. SPI data in.

C data I/O.

Digital I/O. SPI data out.

Digital I/O. EUSART1 asynchronous transmit. EUSART1 synchronous clock (see related RX1/DT1).

C™ mode.

RC7/RX1/DT1

RC7

RX1

DT1 Legend: TTL = TTL compatible input CMOS = CMOS compatible input or output

ST = Schmitt Trigger input with CMOS levels Analog = Analog input I = Input O = Output P= Power I2C™/SMB = I2C/SMBus input buffer

Note 1: Alternate assignment for ECCP2 when configuration bit CCP2MX is cleared (all operating modes except

Microcontroller mode).

DS39646B-page 24 Preliminary  2004 Microchip Technology Inc.

I/O I/O

ST ST

Digital I/O. EUSART1 asynchronous receive. EUSART1 synchronous data (see related TX1/CK1).

PIC18F8722 FAMILY

T ABLE 1-4: PIC18F8527/8622/8627/8722 PINOUT I/O DESCRIPTIONS (CONTINUED)

Pin Name

Pin Number

TQFP

Type

Buffer

Type

Description

PORTD is a bidirectional I/O port.

RD0/AD0/PSP0

RD0 AD0 PSP0

RD1/AD1/PSP1

RD1 AD1 PSP1

RD2/AD2/PSP2

RD2 AD2 PSP2

RD3/AD3/PSP3

RD3 AD3 PSP3

RD4/AD4/PSP4/SDO2

RD4 AD4 PSP4 SDO2

RD5/AD5/PSP5/ SDI2/SDA2

RD5 AD5 PSP5 SDI2 SDA2

RD6/AD6/PSP6/ SCK2/SCL2

RD6 AD6 PSP6 SCK2 SCL2

I/O I/O I/O

I/O

I/O I/O I/O I/O I/O

ST TTL TTL

—

ST TTL TTL

C/SMB

ST TTL TTL

C/SMB

Digital I/O. External memory address/data 0. Parallel Slave Port data.

Digital I/O. External memory address/data 1. Parallel Slave Port data.

Digital I/O. External memory address/data 2. Parallel Slave Port data.

Digital I/O. External memory address/data 3. Parallel Slave Port data.

Digital I/O. External memory address/data 4. Parallel Slave Port data. SPI™ data out.

Digital I/O. External memory address/data 5. Parallel Slave Port data. SPI data in.

C™ data I/O.

Digital I/O. External memory address/data 6. Parallel Slave Port data. Synchronous serial clock input/output for SPI mode. Synchronous serial clock input/output for I2C mode.

RD7/AD7/PSP7/SS2

RD7 AD7 PSP7 SS2

Legend: TTL = TTL compatible input CMOS = CMOS compatible input or output

ST = Schmitt Trigger input with CMOS levels Analog = Analog input I = Input O = Output P= Power I

Note 1: Alternate assignment for ECCP2 when configuration bit CCP2MX is cleared (all operating modes except

Microcontroller mode).

 2004 Microchip Technology Inc. Preliminary DS39646B-page 25

I/O I/O I/O

ST TTL TTL

TTL

Digital I/O. External memory address/data 7. Parallel Slave Port data. SPI slave select input.

C™/SMB = I2C/SMBus input buffer

PIC18F8722 FAMILY

TABLE 1-4: PIC18F8527/8622/8627/8722 PINOUT I/O DESCRIPTIONS (CONTINUED)

Pin Name

Pin Number

TQFP

Type

Buffer

Type

Description

PORTE is a bidirectional I/O port.

RE0/AD8/RD

RE0 AD8 RD P2D

RE1/AD9/WR

RE1 AD9 WR P2C

RE2/AD10/CS

RE2 AD10 CS P2B

RE3/AD11/P3C

RE3 AD11 P3C

RE4/AD12/P3B

RE4 AD12 P3B

RE5/AD13/P1C

RE5 AD13 P1C

/P2D

(4)

/P2C

/P2B

I/O I/O

ST TTL TTL

—

ST TTL TTL

—

ST TTL TTL

—

ST TTL

—

ST TTL

—

ST TTL

—

Digital I/O. External memory address/data 8. Read control for Parallel Slave Port. ECCP2 PWM output D.

Digital I/O. External memory address/data 9. Write control for Parallel Slave Port. ECCP2 PWM output C.

Digital I/O. External memory address/data 10. Chip select control for Parallel Slave Port. ECCP2 PWM output B.

Digital I/O. External memory address/data 11. ECCP3 PWM output C.

Digital I/O. External memory address/data 12. ECCP3 PWM output B.

Digital I/O. External memory address/data 13. ECCP1 PWM output C.

RE6/AD14/P1B

RE6 AD14

(4)

P1B

RE7/AD15/ECCP2/P2A

RE7 AD15

(3)

ECCP2

(3)

P2A

Legend: TTL = TTL compatible input CMOS = CMOS compatible input or output

ST = Schmitt Trigger input with CMOS levels Analog = Analog input I = Input O = Output P= Power I

Note 1: Alternate assignment for ECCP2 when configuration bit CCP2MX is cleared (all operating modes except

Microcontroller mode).

DS39646B-page 26 Preliminary  2004 Microchip Technology Inc.

I/O I/O

I/O I/O I/O

ST TTL

—

ST TTL

—

Digital I/O. External memory address/data 14. ECCP1 PWM output B.

Digital I/O. External memory address/data 15. Enhanced Capture 2 input/Compare 2 output/ PWM 2 output. ECCP2 PWM output A.

C™/SMB = I2C/SMBus input buffer

PIC18F8722 FAMILY

T ABLE 1-4: PIC18F8527/8622/8627/8722 PINOUT I/O DESCRIPTIONS (CONTINUED)

Pin Name

Pin Number

TQFP

Type

Buffer

Type

Description

PORTF is a bidirectional I/O port.

RF0/AN5

RF0 AN5

RF1/AN6/C2OUT

RF1 AN6 C2OUT

RF2/AN7/C1OUT

RF2 AN7 C1OUT

RF3/AN8

RF3 AN8

RF4/AN9

RF4 AN9

RF5/AN10/CV

RF5 AN10 CVREF

RF6/AN11

RF6 AN11

REF

I/O

ISTAnalog

I/O

ISTAnalog

I/O

ISTAnalog

I/O

ISTAnalog

Analog

—

Analog

—

ST Analog Analog

Digital I/O. Analog input 5.

Digital I/O. Analog input 6. Comparator 2 output.

Digital I/O. Analog input 7. Comparator 1 output.

Digital I/O. Analog input 8.

Digital I/O. Analog input 9.

Digital I/O. Analog input 10. Comparator reference voltage output.

Digital I/O. Analog input 11.

RF7/SS

Legend: TTL = TTL compatible input CMOS = CMOS compatible input or output

Note 1: Alternate assignment for ECCP2 when configuration bit CCP2MX is cleared (all operating modes except

RF7

ST = Schmitt Trigger input with CMOS levels Analog = Analog input I = Input O = Output P= Power I

Microcontroller mode).

I/O

TTL

Digital I/O. SPI™ slave select input.

C™/SMB = I2C/SMBus input buffer

 2004 Microchip Technology Inc. Preliminary DS39646B-page 27

PIC18F8722 FAMILY

TABLE 1-4: PIC18F8527/8622/8627/8722 PINOUT I/O DESCRIPTIONS (CONTINUED)

Pin Name

Pin Number

TQFP

Type

Buffer

Type

Description

PORTG is a bidirectional I/O port.

RG0/ECCP3/P3A

RG0 ECCP3

P3A

RG1/TX2/CK2

RG1 TX2 CK2

RG2/RX2/DT2

RG2 RX2 DT2

RG3/CCP4/P3D

RG3 CCP4 P3D

RG4/CCP5/P1D

RG4 CCP5 P1D

RG5 See RG5/ MC LR Legend: TTL = TTL compatible input CMOS = CMOS compatible input or output

ST = Schmitt Trigger input with CMOS levels Analog = Analog input I = Input O = Output P= Power I

Note 1: Alternate assignment for ECCP2 when configuration bit CCP2MX is cleared (all operating modes except

Microcontroller mode).

I/O I/O

I/O

I/O I/O

ST ST

—

ST ST ST

ST ST

—

ST ST

—

Digital I/O. Enhanced Capture 3 input/Compare 3 output/ PWM 3 output. ECCP3 PWM output A.

Digital I/O. EUSART2 asynchronous transmit. EUSART2 synchronous clock (see related RX2/DT2).

Digital I/O. EUSART2 asynchronous receive. EUSART2 synchronous data (see related TX2/CK2).

Digital I/O. Capture 4 input/Compare 4 output/PWM 4 output. ECCP3 PWM output D.

Digital I/O. Capture 5 input/Compare 5 output/PWM 5 output. ECCP1 PWM output D.

/VPP pin.

C™/SMB = I2C/SMBus input buffer

DS39646B-page 28 Preliminary  2004 Microchip Technology Inc.

PIC18F8722 FAMILY

T ABLE 1-4: PIC18F8527/8622/8627/8722 PINOUT I/O DESCRIPTIONS (CONTINUED)

Pin Name

Pin Number

TQFP

Type

Buffer

Type

Description

PORTH is a bidirectional I/O port.

RH0/A16

RH0 A16

RH1/A17

RH1 A17

RH2/A18

RH2 A18

RH3/A19

RH3 A19

RH4/AN12/P3C

RH4 AN12

(5)

P3C

RH5/AN13/P3B

RH5 AN13

(5)

P3B

RH6/AN14/P1C

RH6 AN14

(5)

P1C

I/O I/O

I/O

TTL

Analog

—

Analog

—

Analog

—

Digital I/O. External memory address/data 16.

Digital I/O. External memory address/data 17.

Digital I/O. External memory address/data 18.

Digital I/O. External memory address/data 19.

Digital I/O. Analog input 12. ECCP3 PWM output C.

Digital I/O. Analog input 13. ECCP3 PWM output B.

Digital I/O. Analog input 14. ECCP1 PWM output C.

RH7/AN15/P1B

RH7 AN15

(5)

P1B

Legend: TTL = TTL compatible input CMOS = CMOS compatible input or output

ST = Schmitt Trigger input with CMOS levels Analog = Analog input I = Input O = Output P= Power I

Note 1: Alternate assignment for ECCP2 when configuration bit CCP2MX is cleared (all operating modes except

Microcontroller mode).

I/O

Analog

—

Digital I/O. Analog input 15. ECCP1 PWM output B.

C™/SMB = I2C/SMBus input buffer

 2004 Microchip Technology Inc. Preliminary DS39646B-page 29

PIC18F8722 FAMILY

TABLE 1-4: PIC18F8527/8622/8627/8722 PINOUT I/O DESCRIPTIONS (CONTINUED)

Pin Name

Pin Number

TQFP

Type

Buffer

Type

Description

PORTJ is a bidirectional I/O port.

RJ0/ALE

RJ0 ALE

RJ1/OE

RJ1 OE

RJ2/WRL

RJ2 WRL

RJ3/WRH

RJ3 WRH

RJ4/BA0

RJ4 BA0

RJ5/CE

RJ4 CE

RJ6/LB

RJ6 LB

RJ7/UB

RJ7 UB

VSS 11, 31, 51, 70 P — Groun d reference for logic and I/O pins.

DD 12, 32, 48, 71 P — Positive supply for logic and I/O pins.

V AVSS 26 P — Ground reference for analog modules. AVDD 25 P — Positive supply for analog modules. Legend: TTL = TTL compatible input CMOS = CMOS compatible input or output

ST = Schmitt Trigger input with CMOS levels Analog = Analog input I = Input O = Output P= Power I

Note 1: Alternate assignment for ECCP2 when configuration bit CCP2MX is cleared (all operating modes except

Microcontroller mode).

I/O

—

Digital I/O. External memory address latch enable.

Digital I/O. External memory output enable.

Digital I/O. External memory write low control.

Digital I/O. External memory write high control.

Digital I/O. External memory byte address 0 control.

Digital I/O External memory chip enable control.

Digital I/O. External memory low byte control.

Digital I/O. External memory high byte control.

C™/SMB = I2C/SMBus input buffer

DS39646B-page 30 Preliminary  2004 Microchip Technology Inc.

PIC18F8722 FAMILY

2.0 OSCILLATOR CONFIGURATIONS

2.1 Oscillator Types

The PIC18F8722 family of devices can be operated in ten different oscillator modes. The user can program the configuration bi ts, FOSC3:FOSC 0, in Configuratio n Register 1H to select one of these ten modes:

1. LP Low- Power Crystal

2. XT Crystal/Resonator

3. HS High-Speed Crystal/Resonator

4. HSPLL High-Speed Crystal/Resonator

with PLL enabled

5. RC External Resistor/Capacito r with

OSC/4 output on RA6

6. RCIO External Resistor/Capacitor with I/O

on RA6

7. INTIO1 Internal Oscillator with F

on RA6 and I/O on RA7

8. INTIO2 Internal Oscillator with I/O on RA6

and RA7

9. EC External Clock with F

10. ECIO External Clock with I/O on RA6

OSC/4 output

FIGURE 2-1: CRYSTAL/CERAMIC

RESONATOR OPERATION (XT, LP, HS OR HSPLL CONFIGURATION)

(1)

Note 1: See Table 2-1 and T able 2-2 for initial values of

2: A series resistor (R

3: R

OSC1

XTAL

(2)

OSC2

C1 and C2.

strip cut crystals.

F varies with the oscillator mode chosen.

(3)

Sleep

PIC18FXXXX

S) may be required for AT

Internal Logic

T ABLE 2-1: CAPACITOR SELECTION FOR

CERAMIC RESONATORS

Typical Capacitor Values Used:

Mode Freq OSC1 OSC2

2.2 Crystal Oscilla tor/Ceramic Resonators

In XT, LP, HS or HSPLL Oscillator modes, a crystal or ceramic resonator is connected to the OSC1 and OSC2 pins to establish oscillation. Figure 2-1 shows the pin connections.

The oscillator design requires the use of a parallel cut crystal.

Note: Use of a series cut crystal may give a

frequency out of the crystal ma nufacturer’s specifications.

XT 3.58 MHz 22 pF 22 pF Capacitor values are for design guidance only. Different cap acitor values may be required to prod uce

acceptable oscillator operation. The user should test the performance of the oscillator over the expected

DD and temperature range for the application. Refer

V to the following applicat ion notes for oscil lator specific information:

• AN588 – PICmicro

Microcontroller Oscillator

Design Guide

• AN826 – Crystal Oscillator Basics and Crystal

Selection for rfPIC™ and PICmicro

Devices

• AN849 – Basic PICmicro® Oscillator Design

• AN943 – Practical PICmic ro

Oscillator Analysis

and Design

• AN949 – Making Your Oscillator Work See the notes following Table 2-2 for additional

information.

Note: When using resonators with frequencies

above 3.5 MHz, the use of HS mode, rather than XT mode, is recommended. HS mode may be used at any V

DD for

which the controller is rated. If HS is selected, it is possible that the gain of the oscillator will overdrive the resonator. Therefore, a series resistor may be placed between the OSC2 pin and the resonator. As a good starting point, the recommended value of R

S is 330Ω.

 2004 Microchip Technology Inc. Preliminary DS39646B-page 31

PIC18F8722 FAMILY

TABLE 2-2: CAPACITOR SELECTION FOR

QUARTZ CRYSTALS

Osc T y pe

Crystal

Freq

LP 32 kHz 22 pF 22 pF XT 1 MHz

4 MHz

HS 4 MHz

10 MHz 20 MHz

25 MHz Capacitor values are for design guidance only. Different capa citor values may be required to produc e

acceptable oscillator operation. The user should test the performance of the oscillator over the expected VDD and temperature range for the application. Refer to the following a pplicati on not es for os cillator specifi c information:

• AN588 – PICmicro

Design Guide

• AN826 – Crystal Oscillator Basics and Crystal

Selection for rfPIC™ and PICmicro

• AN849 – Basic PICmicro® Oscillator Design

• AN943 – Practical PICmic ro® Oscillator Analy sis

and Design

• AN949 – Making Your Oscillator Work See the notes following this table for additional

information.

Note 1: Higher capacitanc e increases th e stabilit y

of the oscillator but also increases the start-up time.

2: When operating below 3V V

using certain ceramic resonators at any voltage, it may be necessary to use the HS mode or switch to a crystal oscillator.

3: Since each resonator/crystal has its own

characteristics, the user should consult the resonator/crystal manufacturer for appropriate values of external components.

4: Rs may be r equired to av oid overdr iving

crystals with low driv e lev e l spe ci fic ati on.

5: Always verify oscillator perform an ce over

DD and temperature range that is

the V expected for the application.

T ypical Cap acitor V alues

C1 C2

22 pF 22 pF

22 pF 22 pF 22 pF 22 pF

Microcontroller Oscillator

Tested:

Devices

DD, or when

22 pF 22 pF

22 pF 22 pF 22 pF 22 pF

An external clock source may also be connected to the OSC1 pin in the HS mode, as shown in Figure 2-2. When operated in this mode, parameters D033 and D043 apply.

FIGURE 2-2: EXTERNAL CLOCK INPUT

OPERATION (HS OSC CONFIGURATION)

Clock from Ext. System

Open

OSC1

OSC2

PIC18FXXXX

(HS Mode)

2.3 External Clock Input

The EC and ECIO Oscillator mode s require an externa l clock source to be conn ected to the OSC1 pi n. There is no oscillator start-up time required after a Power-on Reset or after an exit from Sleep mode.

In the EC Oscillator mode, the oscillator frequency divided by 4 is available on the OSC2 pin. This signal may be used f or t e st pu r pos es or t o sy nc hr o n iz e ot he r logic. Figure 2-3 shows the pin connections for the EC Oscillator mode.

FIGURE 2-3: EXTERNAL CLOCK

INPUT OPERATION (EC CONFIGURATION)

Clock from Ext. System

OSC/4

The ECIO Oscillator mo de func tio ns lik e t he EC mod e, except that the OSC2 pin becomes an additional general purpose I/O pin. The I/O pin becomes bit 6 of PORTA (RA6). Figure 2-4 shows the pin connections for the ECIO Oscillator mode. When operated in this mode, parameters D033A and D043A apply.

FIGURE 2-4: EXTERNAL CLOCK

Clock from Ext. System

RA6

OSC1/CLKI

PIC18FXXXX

OSC2/CLKO

INPUT OPERATION (ECIO CONFIGURATION)

OSC1/CLKI

PIC18FXXXX

I/O (OSC2)

DS39646B-page 32 Preliminary  2004 Microchip Technology Inc.

PIC18F8722 FAMILY

2.4 RC Oscillator

For timing insensitive applications, the RC and RCIO Oscillator modes offer additional cost savings. The actual oscillator frequency is a function of several factors:

• supply voltage

• values of the external resistor (R capacitor (C

EXT)

• operating temperature

Given the same device, operating voltage and temperature and component values, there will also be unit-to-unit frequency variations. These are due to factors such as:

• normal manufacturing variation

• difference in lead frame capacitance between package types (especially for low C

• variations within the tolerance of limits of REXT

EXT

and C

In the RC Oscillator mode, the oscillator frequency divided by 4 is available on the OSC2 pin. This signal may be used f or t e st pu r pos es or t o sy nc hr o n iz e ot he r logic. Figure 2-5 shows how the R/C combination is connected.

FIGURE 2-5: RC OSCILLATOR MODE

VDD

REXT

OSC1

CEXT VSS

Recommended values: 3 kΩ ≤ REXT ≤ 100 kΩ

OSC/4

OSC2/CLKO

20 pF ≤ C

The RCIO Oscillator mode (Figure 2-6) functions like the RC mode, except that the OSC2 pin becomes an additional general purpose I/O pin. The I/O pin becomes bit 6 of PORTA (RA6).

FIGURE 2-6: RCIO OSCILLATOR MODE

VDD

REXT

OSC1

EXT) and

EXT values)

Internal

Clock

PIC18FXXXX

EXT ≤ 300 pF

Internal

Clock

2.5 PLL Frequency Multiplier

A Phase Locked Loop (PLL) circuit is provided as an option for users who wish to use a lower frequency oscillator circuit or to clock the device up to its highest rated frequency from a crystal oscillator. This may be useful for customers who are concerned with EMI due to high-frequency crystals or users who require higher clock speeds from an internal oscillator.

2.5.1 HSPLL OSCILLATOR MODE

The HSPLL mode make s use of the HS mode osc illator for frequencies up t o 10 MHz. A PLL then multipl ies the oscillator output frequency by 4 to produce an internal clock frequency up to 40 MHz. The PLLEN bit is not available when this mode is configured as the primary clock source.

The PLL is only available to the crystal oscillator when the FOSC3:FOSC0 configu r ati on bi t s are prog ram med for HSPLL mode (= 0110).

FIGURE 2-7: HSPLL BLOCK DIAGRAM

HS Oscillator Enable

PLL Enable

(from Configuration Register 1H)

OSC2

OSC1

HS Mode

Crystal

Osc

FOUT

÷4

2.5.2 PLL AND INTOSC

The PLL is also ava ilabl e to th e inte rnal os cill ator bl ock when the internal oscillator block is configured as the primary clock source. In this configuration, the PLL is enabled in softwa re and gen erates a cl ock o utput o f up to 32 MHz. The operation of INTOSC with the PLL is described in Section 2.6.4 “PLL in INTOSC Modes”.

Phase

Comparator

Loop Filter

VCO

SYSCLK

MUX

CEXT

VSS

RA6

Recommended values: 3 kΩ ≤ REXT ≤ 100 kΩ

 2004 Microchip Technology Inc. Preliminary DS39646B-page 33

I/O (OSC2)

20 pF ≤ C

PIC18FXXXX

EXT ≤ 300 pF

PIC18F8722 FAMILY

2.6 Internal Oscillator Block

The PIC18F8722 family of devices includes a n internal oscillator block which generates two different clock signals; either can be used as the microcontroller’s clock source. This may eliminate the need for external oscillator circuits on the OSC1 and/or OSC2 pins.

The main output (INTOSC) is an 8 MHz clock source, which can be used to directly drive the device clock. It also drives a postscaler, which can provide a range of clock frequencies from 31 kHz to 4 MHz. The INTOSC output is enabled when a clock fre quency from 12 5 kHz to 8 MHz is selected. The INTOSC output can also be enabled when 31 kHz is selected, depending on the INTSRC bit (OSCTUNE<7>).

The other clock source is the internal RC oscillator (INTRC), which provides a nominal 31 kHz output. INTRC is enabled if it is selected as the device clock source; it is also ena bled autom atically when an y of the following are enabled:

• Power-up Timer

• Fail-Safe Clock Monitor

• Watchdog Timer

• Two-Spe ed Start-up These features are discussed in greater detail in

Section 25.0 “Special Features of the CPU”. The clock source frequency (INTOSC direct, INTRC

direct or INTOSC postscaler) is selected by configuring the IRCF bits of the OSCCON register (page 39).

2.6.1 INTIO MODES

Using the internal oscillator as the clock source eliminates the need for up to two external oscillator pins, which can then be used for digital I/O. Two distinct configurations are available:

• In INTIO1 mode, the OSC2 pin outputs F while OSC1 functions as RA7 (s ee Fig ure 2-8) for digital input and output.

• In INTIO2 mode, OSC1 functions as RA7 and OSC2 functions as RA6 (see Figure2-9), both for digital input and output.

FIGURE 2-8: INTIO1 OSCILLATOR MODE

I/O (OSC1) OSC2

PIC18FXXXX

OSC/4

RA7

OSC/4,

2.6.2 INTOSC OUTPUT FREQUENCY

The internal oscillator block is calibrated at the factory to produce an INTOSC output frequency of 8 MHz.

The INTRC oscillator operates independently of the INTOSC source. Any changes in INTOSC across voltage and temperature are not necessarily reflected by changes in INTRC or vice versa.

2.6.3 OSCTUNE REGISTER

The INTOSC output has been calibrated at the factory but can be adjusted in the user’s application. This is done by writing to TUN4:TUN0 (OSCTUNE<4:0>) in the OSCTUNE register (Register 2-1).

When the OSCTUNE regis ter is mo di fied , the IN T O SC frequency will begin shifting to the new frequency. The INTOSC clock will stabilize within 1 ms. Code execution conti nues during t his shift. There is no indication that the shift has occurred. The INTRC is not affected by OSCTUNE.

The OSCTUNE register also implements the INTSRC (OSCTUNE<7>) and PLLEN (OSCTUNE<6>) bits, which control certain features of the internal oscillator block. The INTSRC bit allows users to select which internal oscillator provides the clock source when the 31 kHz frequency optio n i s s ele cted. This is covered in greater detail in Section 2.7.1 “Oscillator Control Register”.

The PLLEN bit controls the operation of the Phase Locked Loop (PLL) in internal oscillator modes (see Figure 2-10).

FIGURE 2-10: INTOSC AND PLL BLOCK

DIAGRAM

8 or 4 MHz

PLLEN

(OSCTUNE<6>)

Phase

Comparator

Loop Filter

INTOSC

FOUT

CLKO

÷4

FIGURE 2-9: INTIO2 OSCILLATOR MODE

OSC2

RA7 RA6

DS39646B-page 34 Preliminary  2004 Microchip Technology Inc.

I/O (OSC1) I/O (OSC2)

PIC18FXXXX

MUX

RA6

VCO

SYSCLK

MUX

PIC18F8722 FAMILY

2.6.4 PLL IN INTOSC MODES

The 4x Phase Locked Loop (PLL) can be us ed with the internal oscillator block to produce faster device clock speeds than are normally possible with the internal oscillator sources. When enabled, the PLL produces a clock speed of 16 MHz or 32 MHz.

Unlike HSPLL mode, the PLL is controlled through software. The control bit, PLLEN (OSCTUNE<6>), is used to enable or disable its operation.

The PLL is available when the device is configured to use the internal oscillator block as its primary clock source (FOSC3:FOSC0 = 1001 or 1000). A dditionally, the PLL will only function when the selected output frequency is either 4 MHz or 8 MHz (OSCCON<6:4> = 111 or 110). If both of these conditions are not met, the PLL is disabled and the PLLEN bit remains clear (writes are ignored).

2.6.5 INTOSC FREQUENCY DRIFT

The factory calibrates the internal oscillator block output (INTOSC) for 8 MHz. However, this frequency may drift as V affect the controller operation in a variety of ways. It is possible to adjust the INTOSC frequency by modifying the value in the OSCTUNE register. Depending on the device, this may have no effect on the INTRC clock source frequency.

Tuning the INTOSC source requires knowing when to make the adjustment, in which direction it should be made and in some cases, how large a change is needed. Three compensation techniques are discus sed in Section 2.6.5.1 “Compensating with the

EUSART”, Section 2.6.5.2 “Compensating with the Timers” and Section 2.6.5.3 “Compensatin g w it h th e CCP Module in Capture Mode” but other techniques

may be used.

DD or temperature changes and can

REGISTER 2-1: OSCTUNE: OSCILLATOR TUNING REGISTER

R/W-0 R/W-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

INTSRC PLLEN

bit 7 bit 0

(1)

— TUN4 TUN3 TUN2 TUN1 TUN0

bit 7 INTSRC: Internal Oscillator Low-Frequency Source Select bit

1 = 31.25 kHz device clock derived from 8 MHz INTOSC source (divide-by-256 enabled) 0 = 31 kHz device clock derived directly from INTRC internal oscillator

bit 6 PLLEN: Frequency Multiplier PLL for INTOSC Enable bit

1 = PLL enabled for INTOSC (4 MHz and 8 MHz only) 0 = PLL disabled

Note 1: Available only in certain oscillator configurations; otherwise, this bit is unavailable

and reads as ‘0’. See Section 2.6.4 “PLL in INTOSC Modes” for details.

bit 5 Unimplemented: Read as ‘0’ bit 4-0 TUN4:TUN0: Frequency Tuning bits

01111 = Maximum frequency

• •

00001 00000 = Center frequency. Oscillator module is running at the calibrated frequency. 11111

• •

• • 10000 = Minimum frequency

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

(1)

 2004 Microchip Technology Inc. Preliminary DS39646B-page 35

PIC18F8722 FAMILY

2.6.5.1 Compensating with the EUSART

An adjustment may be required when the EUSART begins to generate frami ng errors or rec eive s dat a with errors while in Asynchronous mode. Framing errors indicate that the device clock frequency is too high. To adjust for this, decrement the value in OSCTUNE to reduce the clock frequency. On the other hand, errors in data may sugge st that the clock speed is too low. To compensate, increment OSCTUNE to increase the clock frequency.

2.6.5.2 Compensating with the Timers

This technique compares device clock speed to some reference clock. Two timers may be used; one timer is clocked by the peripheral clock, while the other is clocked by a fixed reference source, such as the Timer1 oscillat or.

Both timers are cleared, but the timer clocked by the reference generates interrupts. When an interrupt occurs, the internally clocked timer is read and both timers are cleared. If the internally clocked timer value is much greater than expected, then the internal oscillator block is running too fast. To adjust for this, decrement the OSCTUNE register.

2.6.5.3 Compensating with the CCP Module in Capture Mode

A CCP module can use free running Timer1 (or Timer3), cl oc ked by the internal oscillator block and an external event with a known period (i.e., AC power frequency). The ti me of the first ev ent is capt ured in the CCPRxH:CCPRxL registers and is recorded for use later. When the second event causes a capture, the time of the first event is su btra cte d fro m the time of th e second event. Since the period of the external event is known, the time difference between events can be calculated.

If the measured time is much greater than the calculated time, the inte rnal oscillator block is running too fast. To compensate, decrement the OSCTUNE register. If the measured time is much less than the calculated time, the inte rnal oscillator block is running too slow. To compensate, increment the OSCTUNE register.

DS39646B-page 36 Preliminary  2004 Microchip Technology Inc.

PIC18F8722 FAMILY

2.7 Clock Sources and Oscillator Switching

The PIC18F8722 family of devices includes a feature that allows the devic e clock so urce to be swit ched fro m the main oscillator to an alternate clock source. These devices also offer two alternate clock sources. When an alternate clock source is enabled, the various power-managed operating modes are available.

Essentially, there are three clock sources for these devices:

• Primary oscillators

• Secondary oscillators

• Internal oscillator block

The primary oscillators include the Ex ternal Crystal and Resonator modes, the External RC modes, the External Clock modes and the internal oscillator block. The particular mode is defined by the FOSC3:FOSC0 configuration bits. The details of these modes are covered earlier in this chapter.

The se condary oscillators are those external sources not connected to the OSC1 or OSC2 pins. These sources may continue to operate even after the controller is placed in a power-managed mode.

The PIC18F8722 family of devices offers the Timer1 oscillator as a secon dary oscilla tor . This osc illator , in all power-managed modes, is often the time base for functions such as a real-time cloc k.

Most often, a 32.768 kHz watch crystal is connected between the RC0/T1OSO/T13CKI and RC1/T1OSI pins. Like the LP mode oscillator circuit, loading capacitors are also connected from each pin to ground.

The Timer1 oscillator is discussed in greater detail in Section 13.3 “Timer1 Oscillator”.

In addition to being a prim ary clock source, the internal oscillator block is available as a power-managed mode clock source. T he IN TR C s ource is also used as the clock source for several special features, such as the WDT and Fail-Safe Clock Monitor.

The clock sources for the PIC18F8722 famil y of devic es are shown in Figure 2-11. See Section 25.0 “Special

Features of the CPU” for Configuration register details.

FIGURE 2-11: PIC18F8722 FAMILY CLOCK DIAGRAM

OSC2

OSC1

T1OSO

T1OSI

Primary Oscillator

Sleep

Secondary Oscillator

T1OSCEN Enable Oscillator

OSCCON<6:4>

Internal

Oscillator

Block

8 MHz

Source INTRC

Source

31 kHz (INTRC)

PIC18F6527/6622/6627/6722/8527/8622/8627/8722

HSPLL, INTOSC/PLL

MUX

OSCTUNE<6>

8 MHz

(INTOSC)

4 x PLL

OSCCON<6:4>

8 MHz

111

4 MHz

110

2 MHz

101

1 MHz

31 kHz

100

011

010

001

000

OSCTUNE<7>

500 kHz

Postscaler

250 kHz 125 kHz

1 0

LP, XT, HS, RC, EC

T1OSC

Internal Oscillator

FOSC3:FOSC0

Peripherals

MUX

CPU

Clock

Control

Clock Source Option for other Modules

WDT, PWRT, FSCM and Two-Speed Start-up

IDLEN

OSCCON<1:0>

 2004 Microchip Technology Inc. Preliminary DS39646B-page 37

PIC18F8722 FAMILY

2.7.1 OSCILLATOR CONTROL REGISTER

The OSCCON register (Register 2-2) controls several aspects of the device clock’s operation, both in full power operation and in power-managed modes.

The System Clock Select bits, SCS1:SCS0, select the clock source. The available clock sources are the primary clock (defined by the FOSC3:FOSC0 configuration bits), the secondary clock (Timer1 oscillator) and the internal oscillator block. The clock source changes immediately after either of the SCSI:SCSO bits are changed, following a brief clock transition interval. The SCS bits are reset on all forms of Reset.

The Internal Oscillator Frequency Select bits (IRCF2:IRCF0) select the frequency output of the internal oscillator block to drive the device clock. The choices are the INTRC source (31 kHz), the INTOSC source (8 MHz) or one of the frequencies derived from the INTOSC postscaler (31.25 kHz to 4 MHz). If the internal oscillator block is supplying the device clock, changing the states of these bits will have an immediate change on the internal oscillator’s output. On device Resets, the default output frequency of the internal oscillator block is set at 1 MHz.

When a nominal ou tput frequenc y of 31 kHz is selected (IRCF2:IRCF0 = 000), users may choose which internal oscillator acts as the source. This is done with the INTSRC bit in the OSCTUNE register (OSCTUNE<7>). Setting this bit selects INTOSC as a

31.25 kHz clock source derived from the INTOSC postscaler . Clearing INTSRC select s INTRC (nom inally 31 kHz) as the clock source and disables the INTOSC to reduce current consumption.

This option allows users to select the tunable and more precise INTOSC as a clock source, while maintaining power savings wit h a very low clock speed . Additionally , the IN T OSC so urce w ill alread y be sta ble s hould a switch to a higher frequency be needed quickly. Regardless of the setting of INTSRC, INTRC always remains the clock source for features such as the Watchdog Timer and the Fail-Safe Clock Monitor.

The OSTS, IOFS and T1RUN bit s ind ic ate wh ich clock source is currently providing the device clock. The OSTS bit indicates that the Oscillator Start-up Timer and PLL St art-up T im er (if enabled) ha ve timed o ut and the primary clock is providing the device clock in primary clock modes. The IOFS bit indicates when the internal oscillator block has stabilized and is providing the device clock in RC Clock modes. The T1RUN bit (T1CON<6>) indicates when the Timer1 oscillator is providing the device clock in secondary clock modes. In power-managed modes, only one of these three bits will be set at any time. If none of these bits are set, the INTRC is providing the clock or the internal oscillator block has just started and is not yet stable.

The IDLEN bit controls whether the device goes into Sleep mode or one of the Idle modes when the SLEEP instruction is executed.

The use of the flag and control bits in the OSCCON register is discussed in more detail in Section 3.0

“Power-Managed Modes”.

Note 1: The Timer1 oscillator must be enabled to

select the secondary clock source. The Timer1 osc illator is enabled by s etting the T1OSCEN bit in th e T imer1 C ontrol re gister (T1CON<3>). If the Timer1 oscillator is not enabled, then any at tem pt to se lec t a secondary clock source will be ignored.

2: It is recommended that the Timer1

oscillator be operating and stable before selecting the secondary clock source or a very long delay may occur while the Timer1 oscillator starts.

2.7.2 OSCILLATOR TRANSITIONS

The PIC18F8722 family of d ev ic es c on t ai ns cir cui try to prevent clock “glitches” when switching between clock sources. A short pause in the device clock occurs during the clock switch. T he length o f this p ause is th e sum of two cycles of the old clock source and three to four cycles of the new clock source. This formula assumes that the new clock source is stable.

Clock transitions are discussed in greater detail in Section 3.1.2 “Entering Power-Managed Modes”.

DS39646B-page 38 Preliminary  2004 Microchip Technology Inc.

PIC18F8722 FAMILY

REGISTER 2-2: OSCCON: OSCILLATOR CONTROL REGISTER

R/W-0 R/W-1 R/W-0 R/W-0 R

IDLEN IRCF2 IRCF1 IRCF0 OSTS IOFS SCS1 SCS0

bit 7 bit 0

bit 7 IDLEN: Idle Enable bit

1 = Device enters an Idle mode when a SLEEP instruction is executed 0 = Device enters Sleep mode when a SLEEP instruction is executed

bit 6-4 IRCF2:IRCF0: Internal Oscillator Frequency Select bits

111 = 8 MHz (INTOSC drives clock directly) 110 = 4 MHz 101 = 2 MHz 100 = 1 MHz 011 = 500 kHz 010 = 250 kHz 001 = 125 kHz 000 = 31 kHz (from either INTOSC/256 or INTRC directly)

bit 3 OSTS: Oscillator Start-up Time-out Status bit

1 = Oscillator Start-up Timer (OST) time-out has expired; primary oscillator is running 0 = Oscillator Start-up Timer (OST) time-out is running; primary oscillator is not ready

bit 2 IOFS: INTOSC Frequency Stable bit

1 = INTOSC frequency is stable 0 = INTOSC frequency is not stable

bit 1-0 SCS1:SCS0: System Clock Select bits

1x = Internal oscillator block 01 = Secondary (Timer1) oscillator 00 = Primary oscillator

(3)

(1)

(4)

(1)

(5)

(2)

R-0 R/W-0 R/W-0

Note 1: Reset state depends on state of the IESO configuration bit.

2: Source selected by the INTSRC bit (OSCTUNE<7>), see text. 3: Default output frequency of INTOSC on Reset. 4: Modifying the SCSI:SCSO bits will cause an immediate clock source switch. 5: Modifying the IRCF3:IRCF0 bits will cause an immediate clock frequency switch if

the internal oscillator is providing the device clocks.

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

 2004 Microchip Technology Inc. Preliminary DS39646B-page 39

PIC18F8722 FAMILY

2.8 Effects of Power-Managed Modes on the Various Clock Sources

When PRI_IDLE mode is selected, the configured oscillator continues to run without interruption. For all other power-managed modes, the oscillator using the OSC1 pin is disa bled. The OSC1 pin (and OSC2 pi n i n crystal oscillator modes) will stop oscillating.

In secondary clock modes (SEC_RUN and SEC_IDLE), the Timer1 oscillator is operating and providing the device clock. The Timer1 oscillator may also run in all power-managed modes if required to clock Timer1 or Timer3.

In internal oscillator modes (RC_RUN and RC_IDLE), the internal oscillator block provides the device clock source. The 31kHz INTRC output can be used d irectl y to provide the clock and may be enabled to support various special features, regardless of the powermanaged mode (see Section 25.2 “Watchdog Timer (WDT)” and Section 25.4 “Fail-Safe Clock Monitor” for more information). The INTOSC output at 8 MHz may be used directly to clock the device or may be divided down by the postscaler. The INTOSC output is disabled if the clock is provi ded directly from the INTRC output. The I NTOSC output is also enab led for TwoSpeed Start-up at 1 MHz after Resets and when configured for wake from Sleep mode.

If the Sleep mode is selected, all clock sources are stopped. Since all the transistor switching currents have been stopped, Sleep mode achieves the lowest current consumption of the device (only leakage currents).

Enabling any on-chip feature that will operate during Sleep will increas e the current cons umed during S leep. The INTRC is required to support WDT operation. The Timer1 oscillator may be operating to support a realtime clock. Other features m ay be op erating th at do not require a device clock source (i.e., SSP slave, PSP, INTn pins and others). Peripherals that may add significant current consumption are listed in

Section 28.2 “DC Characteristics”.

2.9 Power-up Delays

Power-up delays are controlled by two or three timers, so that no external Reset circuitry is required for most applications. The delays ensure that the device is kept in Reset until the device power supply is stable under normal circumstances and the primary clock is operating and stable. For additional information on power-up delays, see Section 4.5 “Device Reset Timers”.

The first timer is the Power-up Timer (PWRT) which provides a fixed delay on power-up (parameter 33, Table 28-12). It is enabled by clearing (= 0) the PWRTEN

2.9.1 DELAYS FOR POWER-UP AND

The second timer is the Oscillator Start-up Timer (OST), intended to delay execution until the crystal oscillator is stable (LP, XT and HS modes). The OST does this by counting 1024 oscillator cycles before allowing the oscillator to clock the device.

When the HSPLL Oscillator mode is selected, a third timer delays execution for an additional 2 ms following the HS mode OST delay, so the PLL can lock to the incoming clock frequency. At the end of these delays, the OSTS bit (OSCCON<3>) is set.

There is a delay of interval T Table 28-12), once execution is allowed to start, when the controller becomes ready to execute instructions. This delay runs concurrently with any other delays. This may be the only delay that occurs when any of the EC, RC or INTIO modes are used as the prim ary cl oc k source.

configuration bit (CONFIG2 L<0 >).

RETURN TO PRIMARY CLOCK

CSD (parameter 38,

TABLE 2-3: OSC1 AND OSC2 PIN STATES IN SLEEP MODE

OSC Mode OSC1 Pin OSC2 Pin

RC, INTIO1 Floating, external resistor pulls high At logic low (clock/4 output) RCIO Floating, external resistor pulls high Configured as PORTA, bit 6 INTIO2 Configured as PORTA, bit 7 Configured as PORTA, bit 6 ECIO Floating, driven by external clock Configured as PORTA, bit 6 EC Floating, driven by external clock At logic low (clock/4 output) LP, XT and HS Feedback inverter disabled at quiescent

voltage level

Note: See Table 4-2 in Section 4.0 “Reset” for time-outs due to Sleep and MCLR

DS39646B-page 40 Preliminary  2004 Microchip Technology Inc.

Feedback inverter disabled at quiescent voltage level

Reset.

PIC18F8722 FAMILY

3.0 POWER-MANAGED MODES

The PIC18F8722 family of devices offers a total of seven operating modes for more efficient power management. These modes prov ide a vari ety of options for selective power conservation in applications where resources may be limited (i.e., battery-powered devices).

There are three categories of power-managed modes:

• Run modes

• Idle modes

• Sleep mode These categories define which portions of the device

are clocked and some times , what sp eed. The R un and Idle modes may use any of the three available clock sources (primary, secondary or internal oscillator block); the Sleep mode does not use a clock source.

The power-managed modes include several powersaving features offered on previous PICmicro devices. One is the clock switching feature, offered in other PIC18 devices, allowing the controller to use the Timer1 os cil la tor in pl ac e of the prim ary osc il lato r. Also included is the Sleep mode, offered by all PICmicro devices, where all device clocks are stopped.

3.1 Selecting Power-Managed Modes

Selecting a power-managed mode requires two decisions: if the CPU is to be clocked or not and the selection of a clock source. The IDLEN bit (OSCCON<7>) controls CPU clocking, while the SCS1:SCS0 bits (OSCCON<1:0>) select the clock source. The individual modes, bit settings, clock sources and affected modules are summariz ed in Table 3-1.

3.1.1 CLOCK SOURCES

The SCS1:SCS0 bits allow the sele ction of one o f three clock sources for power-managed modes. They are:

• the primary clock, as defined by the FOSC3:FOSC0 configuration bits

• the secondary clock (the Timer1 oscillator)

• the internal oscillator block (for INTOSC modes)

3.1.2 ENTERING POWER-MANAGED

MODES

Switching from one power-managed mode to another begins by loading the OSCCON register. The SCS1:SCS0 bits selec t the clock sourc e and determin e which Run or Idle mode is to be used. Changing these bits causes an immediate switch to the new clock source, assuming that it is running. The switch may also be sub ject to clock tr ansition delays. These are discussed in Section 3.1.3 “Clock Transitions and Status Indicators” and subsequent sections.

Entry to the power-managed Idle or Sleep modes is triggered by the execution of a SLEEP instruction. The actual mode that results depends on the status of the IDLEN bit.

Depending on the current mode and the mode being switched to, a change to a power-managed mode does not always require setting all of these bits. Many

transitions may be done by changing the oscillator s elect

bits, or changing the IDLEN bit, prior to issuing a SLEEP instruction. If the IDLEN bit is already configured

correctly, it may only be necessary to perform a SLEEP

instruction to switch to the desired mode.

TABLE 3-1: POWER-MANAGED MODES

Mode

Sleep 0 N/A Off Off None – All clocks are disabled PRI_RUN N/A 00 Clocked Clocked Primary – LP, XT, HS, HSPLL, RC, EC and

SEC_RUN N/A 01 Clocked Clocked Secondary – Timer1 Oscillator RC_RUN N/A 1x Clocked Clocked Internal Oscillator Block PRI_IDLE 100Off Clocked Primary – LP, XT, HS, HSPLL, RC, EC SEC_IDLE 101Off Clocked Secondary – Timer1 Oscillator RC_IDLE 11xOff Clocked Internal Oscillator Block

Note 1: IDLEN reflects its value when the SLEEP instruction is executed.

2: Includes INTOSC and INTOSC postscaler, as well as the INTRC source.

 2004 Microchip Technology Inc. Preliminary DS39646B-page 41

OSCCON Bits Module Clocking

IDLEN<7>

(1)

SCS<1:0> CPU Peripherals

Available Clock and Oscillator Source

(2)

Internal Oscillator Block This is the normal full power execution mode.

(2)

PIC18F8722 FAMILY

3.1.3 CLOCK TRANSITI ONS AND S TATUS INDICATORS

The length of the transition between clock sources is the sum of two cycles o f the old clo ck so urce an d three to four cycl es of the new clock so urce. This formula assumes that the new clock source is stable.

Three bits indicate the current clock source and its status. They are:

• OSTS (OSCCON<3>)

• IOFS (OSCCON<2>)

• T1RUN (T1CON<6>)

In general, only one of these bits will be set while in a given power-managed mode. When the OSTS bit is set, the primary clock is providing the device clock. When the IOFS bit is set, the INTOSC output is providing a stable 8 MHz clock source to a divider that actually drives the device clock. When the T1RUN bit is set, the Timer1 oscillator is providing the clock. If none of these bits are set, then either the INTRC clock source is cloc ki ng t he dev ic e, o r th e INTOSC source is not yet stable.

If the internal oscillator block is configured as the primary clock source b y the FOSC 3:FOSC0 co nfiguratio n bits, then both the OSTS and IOFS bits may be set when in PRI_RUN or PRI_IDLE modes. This indicates that the primary clock (INTOSC output) is generating a stable 8 MHz output. Entering another INTOSC powermanaged mode at the sam e fre que nc y w ou ld cle ar th e OSTS bit.

Note 1: Caution should be used when modifying a

single IRCF bit. I f V possible to select a higher clock speed than is supported by the low VDD. Improper device operation may result if the VDD/FOSC specifications are violated.

2: Executing a SLEEP instruction does not

necessarily place the device into Sleep mode. It acts as the trigger to place the controller into either the Sleep mode or one of the Idle modes, depending on the setting of the IDLEN bit.

DD is less than 3V, it is

3.1.4 MULTIPLE SLEEP COMMANDS

The power-managed mode that is invoked with the SLEEP instruction is determined by the setting of the IDLEN bit at the time the instruction is executed. If another SLEEP instruction is executed, the device will enter the power-ma nag ed mo de s pe ci fie d by ID L EN at that time. If IDLEN has changed, the device will enter the new power-managed mode specified by the new setting.

3.2 Run Modes

In the Run modes, clocks to both the core and peripherals are active. The difference between these modes is the clock source.

3.2.1 PRI_RUN MODE

The PRI_RUN mode is the normal, full power execution mode of the microcontroller. This is also the default mode upon a device Reset, un less T wo-Speed S tart-up is enabled (see Section 25.3 “Two-Speed Start-up” for details). In this m ode, the OSTS bi t is set. Th e IOFS bit may be set if the internal oscillator block is the primary clock source (see Section 2.7.1 “Oscillator Control Register”).

3.2.2 SEC_RUN MODE

The SEC_RUN mode is the compatible mode to the “clock switching” feature offered in other PIC18 devices. In this mode, the CPU and peripherals are clocked from the T imer1 os cillator. This gives users the option of lower power consumption while still using a high accuracy clock source.

SEC_RUN mode is en tered by sett ing th e SCS1:SCS 0 bits to ‘01’. The device clock source is switched to the Timer1 oscillator (see Figure 3-1), the primary oscillator is shut down, the T1RUN bit (T1CON<6>) is set and the OSTS bit is cleared.

Note: The Timer1 oscillator should already be

running prior to entering SEC_RU N mode. If the T1OSCEN bit is not set when the SCS1:SCS0 bits are set to ‘01’, entry to SEC_RUN mode will not occur. If the Timer1 oscillator is enabled, but not yet running, devic e cloc ks will be de layed u ntil the oscillator has started; in such situations, initial oscillator operation is far from stable and unpredictable operation may result.

On transitions from SEC_RUN mode to PRI_RUN, the peripherals and CPU continue to be clocked from the Timer1 oscillator while the primary clock is started. When the primary clo ck bec omes r eady, a clock switch back to the primary clock occurs (see Figure 3-2). When the clock switch is complete, the T1RUN bit is cleared, the OSTS bit is set and the primary clock is providing the clock. The IDLEN and SCS bits are not affected by the wake-up; the Timer1 oscillator continues to run.

DS39646B-page 42 Preliminary  2004 Microchip Technology Inc.

PIC18F8722 FAMILY

FIGURE 3-1: TRANSITION TIMING FOR ENTRY TO SEC_RUN MODE

Q4Q3Q2

Q4Q3Q2 Q1 Q3Q2

T1OSI

OSC1

CPU

Clock

Peripheral

Clock

Program

Counter

Note 1: Clock transition typically occurs within 2-4 T

123 n-1n

Clock Transition

OSC.

(1)

PC + 2PC

PC + 4

FIGURE 3-2: TRANSITION TIMING FROM SEC_RUN MODE TO PRI_RUN MODE (HSPLL)

T1OSI

OSC1

PLL Clock

Output

CPU Clock

Peripheral

Clock

Program

Counter

Q1 Q3 Q4

(1)

TOST

Q3 Q4 Q1

Q2 Q2 Q3

(1)

TPLL

12 n-1n

Clock

Transition

(2)

PC + 2

PC + 4

SCS1:SCS0 bits Changed

Note 1: TOST = 1024 TOSC; TPLL = 2 ms (approx). These intervals are not shown to scale.

2: Clock transition typically occurs within 2-4 T

OSTS bit Set

OSC.

3.2.3 RC_RUN MODE

In RC_RUN mode, the CPU and peripherals are clocked from the internal oscillator block using the INTOSC multiplexer. In this mode, the primary clock is shut down. When using the INTRC source, this mode provides the best power conservation of all the Run modes, while still executing code. It works well for user applications which are not hi ghl y tim in g sen si tiv e or do not require high-speed clocks at a ll times.

If the primary clock source is the internal oscillator block (either INTRC or INTOSC), there are no distinguishable differences between PRI_RUN and RC_RUN modes during execution. Howeve r, a clock switch delay will occur during entry to and exit from RC_RUN mode. Therefore, if the primary clock source is the internal oscillator block, the use of RC_RUN mode is not recommended.

This mode is entered by setting the SCS1 bit to ‘1’. Although it is ignored, it is rec ommended that the SCS0 bit also be cleared; th is is t o maint ain softwa re comp atibility with future devices. When the clock source is switched to the INTOSC multiplexer (see Figure 3-3), the primary oscillator is shut down and the OSTS bit is cleared. The IRCF bits may be modified at any time to immediately change the clock speed.

Note: Caution should be used when m odi fy ing a

single IRCF bit. If V

DD is less than 3V, it is

possible to select a higher clock speed than is supported by the low VDD. Improper device operation may result if

DD/FOSC specifications are violated.

the V

 2004 Microchip Technology Inc. Preliminary DS39646B-page 43

PIC18F8722 FAMILY

If the IRCF bits and the INTSRC bit are all clear, the INTOSC output is not enabled and the IOFS bit will remain clear; there will be no indication of the current clock source. The INTRC source is providing the device clocks.

If the IRCF bits are changed from all clear (thus, enabling the INTOSC output) or if INTSRC is set, the IOFS bit becomes set after the INTOSC output becomes stable. Clocks to the device continue while the INTOSC source stabilizes after an interval of

IOBST (parameter 39, Table 28-12).

On transitions from RC_RUN mode to PRI_RUN mode, the device continues to be clocked from the INTOSC multiplexer whil e the prim ary clock is st arted. W hen the primary clock becomes ready, a clock switch to the primary clock occurs (see Figure 3-4). When the clock switch is complete, the IOFS bit is cleared, the OSTS bit is set and the primary clock is providing the device clock. The IDLEN and SCS bits are not af fe cte d by the switch. The INTRC source will continue to run if either the WDT or the Fail-Safe Clock Monitor is enabled.

If the IRCF bits w ere prev io us ly at a no n-z ero val ue, or if INTSRC was set before setting SCS1 and the INTOSC source was already stable, the IOFS bi t will remain set.

FIGURE 3-3: TRANSITION TIMING TO RC_RUN MODE

Q4Q3Q2

123 n-1n

Clock Transition

(1)

PC + 2PC

INTRC

OSC1

CPU

Clock

Peripheral

Clock

Program

Counter

Q4Q3Q2 Q1 Q3Q2

PC + 4

Note 1: Clock transition typically occurs within 2-4 T

OSC.

FIGURE 3-4: TRANSITION TIMING FROM RC_RUN MODE TO PRI_RUN MODE

Q3 Q4

INTOSC

Multiplexer

OSC1

PLL Clock

Output

CPU Clock

Peripheral

Clock

Program

Counter

SCS1:SCS0 bits Changed

Note 1: TOST = 1024 TOSC; TPLL = 2 ms (approx). These intervals are not shown to scale.

2: Clock transition typically occurs within 2-4 T

TOST

(1)

TPLL

OSTS bit Set

OSC.

12 n-1n

Clock

Transition

(2)

PC + 2

PC + 4

DS39646B-page 44 Preliminary  2004 Microchip Technology Inc.

PIC18F8722 FAMILY

3.3 Sleep Mode

The power-managed Sleep mode in the PIC18F8722 family of devices is identical to the legacy Sleep mode offered in all other PICmicro devices. It is entered by clearing the IDLEN bit (the default state on device Reset) and executing the SLEEP instruction. This shut s down the selected oscillator (Figure 3-5). All clock source status bits are cleared.

Entering the Sleep m ode from any other mo de does not require a clock switch. This is because no clocks are needed once the controller has entered Sleep. If the WDT is selected, the INTRC source will continue to operate. If the Timer1 oscillator is enabled, it will also continue to run.

When a wake ev ent occurs i n Sleep mo de (by int errupt, Reset or WDT time-out), the device wil l not be clocke d until the clock source selected by the SCS1:SCS0 bits becomes ready (see Figure 3-6), or it will be clocked from the internal oscillator block if either the TwoSpeed Start-up or the Fail-Safe Clock Monitor are enabled (s ee Section 25.0 “Special Features of the CPU”). In either case, the OSTS bit is set when the primary clock is providing the device clocks. The IDLEN and SCS bits are not affected by the wake-up.

3.4 Idle Modes

The Idle modes allow the controller’s CPU to be selectively shut down while the peripherals continue to operate. Selecting a particular Idle mode allows users to further manage power consumption.

If the IDLEN bit i s set to a ‘1’ when a SLEEP inst ruction is executed, the periph erals will be cl ocked fro m the cloc k source selected us ing the SCS1:SCS 0 bits; howev er , the CPU will not be clocked. The clock source status bits are not affected. Setting IDLEN and executing a SLEEP instruction pr ovides a quick method of switchi ng from a given Run mo de to its corresponding Idle mode.

If the WDT is selected, the INTRC source will continue to operate. If the T imer1 oscill ator is enable d, it will also continue to run.

Since the CPU is not executing instructions, the only exits from any of the Idle modes are by interrupt, WDT time-out or a Reset. When a wak e even t occur s, CPU execution is delayed by an interval of T (parameter 38, Table 28-12) while it becomes ready to execute code. When the CPU begins executing code, it resumes with the same clock source for the current Idle mode. For example, when waking from RC_IDLE mode, the internal oscillator block will clock the CPU and peripherals (in other words, RC_RUN mode). The IDLEN and SCS bits are not affected by the wake-up.

While in any Idle mode or the S leep mode, a WDT time-out will result in a WDT wake-up to the Run mode currently specified by the SCS1:SCS0 bits.

CSD

FIGURE 3-5: TRANSITION TIMING FOR ENTRY TO SLEEP MODE

Q4Q3Q2

Q1Q1

OSC1

CPU

Clock

Peripheral

Clock Sleep

Program

Counter

PC + 2PC

FIGURE 3-6: TRANSITION TIMING FOR WAKE FROM SLEEP (HSPLL)

Q1 Q2 Q3 Q4 Q1 Q2

OSC1

(1)

PLL Clock

Output

CPU Clock

Peripheral

Clock

Program

Counter

Wake Event

OST = 1024 TOSC; TPLL = 2 ms (approx). These intervals are not shown to scale.

Note 1: T

TOST

(1)

TPLL

OSTS bit S et

Q3 Q4 Q1 Q2

PC + 2

Q3 Q4

PC + 4

Q1 Q2 Q3 Q4

PC + 6

 2004 Microchip Technology Inc. Preliminary DS39646B-page 45

PIC18F8722 FAMILY

3.4.1 PRI_IDLE MODE

This mode is uni que among the thre e low-power Idle modes, in that it does not disable the primary device clock. For timing sensitive applications, this allows for the fastest resump tion of devic e operation with its more accurate pri mary clock source, si nce the cl ock source does not have to “warm-up” or transition from another oscillator.

PRI_IDLE mode is entered from PRI_RUN mode by setting the IDLEN bit and executing a SLEEP instruction. If the device is in another Run mode, set IDLEN first, then clear the SCS bits and execute SLEEP. Although the CPU is disab led, th e peri pherals c ontinu e to be clocked from the primary clock source specified by the FOSC3:FOSC0 config uration bit s. The OSTS bit remains set (see Figure3-7).

When a wake event occurs, the CPU is clocked from the primary clock source. A delay of interval T (parameter 39, Table 28-12) is required between the wake event and when code execution starts. This is required to allow the CPU to become ready to ex ecute instructions. Afte r the wake-up, the OSTS bit remains set. The IDLEN and SCS b its are not affected by the wake-up (see Figure 3- 8).

CSD

3.4.2 SEC_IDLE MODE

In SEC_IDLE mode, the CPU is disabled but the peripherals continue to be clocked from the Timer1 oscillator. This mode is entered from SEC_RUN by setting the IDLEN bit and executi ng a SLEEP instruction. If the device is in another Run mode, set the IDLEN bit first, then set the SCS1:SCS0 bits to ‘01’ and exec ute SLEEP. When the clock source is switched to the Timer1 oscillator, the primary oscillator is shut down, the OSTS bit is cleared and the T1RUN bit is set.

When a wake event occ urs, the pe ripherals continue to be clocked from the Timer1 oscillator. After an interval

CSD following the wake event, the CPU begi ns ex e-

of T cuting code being cloc ked by the T im er1 oscil lator . Th e IDLEN and SCS bits are not affected by the wake-up; the Timer1 oscillator continues to run (see Figure 3-8).

Note: The Timer1 oscillator should already be

running prior to entering SEC_IDLE mod e. If the T1OSCEN bit is not set when the SLEEP instruction is executed, the SLEEP instruction will be ignored and entry to SEC_IDLE mode will not occur. If the Timer1 oscillator is enabled but not yet running, peripheral clocks will be delayed until the oscillator has started. In such situations, initial oscillator operation is far from stable and unpredictable operation may result.

FIGURE 3-7: TRANSITION TIMING FOR ENTRY TO IDLE MODE

OSC1

CPU Clock

Peripheral

Clock

Program

Counter

PC PC + 2

FIGURE 3-8: TRANSITION TIMING FOR WAKE FROM IDLE TO RUN MODE

OSC1

CPU Clock

Peripheral

Clock

Program

Counter

Q1 Q3 Q4

TCSD

Wake Event

DS39646B-page 46 Preliminary  2004 Microchip Technology Inc.

PIC18F8722 FAMILY

3.4.3 RC_IDLE MODE

In RC_IDLE mode, t he C PU is d isabled but the peripherals continue to b e c loc ke d fro m t he internal oscillator block using the INTOSC multiplexer. This mode allows for controllable power cons ervation during Idl e periods .

From RC_RUN, this mode is entered by setting the IDLEN bit and executing a SLEEP instruction. If the device is in a nother Run mode, first s et IDLEN, th en set the SCS1 bit and execute SLEEP. Although its value is ignored, it is reco mmended that SCS0 also be cle ared; this is to maintain software compatibility with future devices. The INTOSC multiplexer may be used to select a higher clock frequency by modifying the IRCF bits before exec uti ng th e SLEEP instruction. When the clock source is switched to the IN TOSC mult iplexer , the primary oscillator is shut down and the OSTS bit is cleared.

If the IRCF bits are set to any non-zero value, or the INTSRC bit is set, the INTOSC output is enabled. The IOFS bit becomes set, after the INTOSC output becomes stable, after an interval of T (parameter 39, Table 28-12). Clocks to the peripherals continue while the INTOSC source stabilizes. If the IRCF bits were previously at a non-zero value, or INTSRC was set before the SLEEP instr uction was ex ecuted and the INTOSC source was already stable, the IOFS bit will remain set. If the IRCF bits and INTSRC are all clear , the INT OSC output will n ot be enabled, the IOFS bit will remain c lear and there will be no ind ication of the current clock source.

When a wake event occ urs, the pe ripherals co ntinue to be clocked from the INTOSC multiplexer. After a delay

CSD (parameter 38, Table 28-12) following the wake

of T event, the CPU begins executing code being clocked by the INTOSC multiplexer. The IDLEN and SCS bits are not affec ted by the wake-up. T he INTRC sou rce will continue to run if eith er the WDT or the Fa il-Safe C loc k Monitor is enabled.

IOBST

3.5 Exiting Idle and Sleep Modes

An exit from Sleep mode or any of the Idle modes is triggered b y an interrupt , a Reset or a WDT time-out. This section discusses the triggers that cause exits from power-managed modes. The clocking subsystem actions are discussed in each of the power-managed modes (see Section 3.2 “Run Modes”, Section 3.3 “Sleep Mode” and Section 3.4 “Idle Modes”).

3.5.1 EXIT BY INTERRUPT

Any of the available interrupt sources can cause the device to exit from an Idle mode or the Sleep mode to a Run mode. To enable this functionality, an interrupt source must be enab led by s etti ng i t s en able bit in one of the INTCON or PIE registers. The exit sequence is initiated when the c orresponding interrupt flag bit is set.

On all exits from Idl e or Sleep modes by interrupt, code execution branches to the interrupt vector if the GIE/ GIEH bit (INTCON<7>) is set. Otherwise, code execution continues or resumes without branching (see Section 10.0 “Interrupts”).

A fixed delay of interval T is required when leaving Sleep and Idle modes. This delay is required for the CPU to prepare for execution. Instructio n execution r esumes on th e first clock c ycle following this delay.

CSD following th e wak e ev en t

3.5.2 EXIT BY WDT TIME-OUT

A WDT time-out will cause different actions depending on which power-managed mode the device is in when the time-out occurs.

If the device i s not exec uti ng code (al l Idle mode s and Sleep mode), the time-out will res ul t in a n ex it fro m the power-managed mode (see Section 3.2 “Run Modes” and Section 3.3 “Sleep Mode”). If the device is executing code (all Run modes), the time-out will result in a WDT Reset (see Section 25.2 “Watchdog Timer (WDT)”).

The WDT timer and postscaler are cleared by executing a SLEEP or CLRWDT instruction, the loss of a currently selected clock source (if the Fail-Safe Clock Monitor is enabled) and modifying the IRCF bits in the OSCCON register if the internal oscillator block is the device clock source.

3.5.3 EXIT BY RESET

Normally, the device is held in Reset by the Oscillator Start-up Timer (OST) until the primary clock becomes ready. At that time, the OSTS bit is set and the device begins executing code. If the internal oscillator bloc k i s the new clock source, the IOFS bit is set instead.

The exit delay time from Reset to the start of code execution depends on both the clock sources before and after the wake-up and the type of oscillator if the new clock source is the primary clock. Exit delays are summarized in Table 3-2.

Code execution can begin before the primary clock becomes ready. If either the Two-Speed Start-up (see Section 25.3 “Two-Speed Start-up”) or Fail-Safe Clock Monitor (see Section 25.4 “Fail-Safe Clock Monitor”) is enabled, the device may begin execution as soon as the Reset source ha s cle are d. Execution is clocked by the INTO SC mu lti ple xe r driv en b y th e internal oscillator bloc k. Executi on is clo cked by the interna l oscillator block until either the primary clock becomes ready or a power-mana ged mo de is ente red befo re the primary clock beco mes re ady; the pri mary clo ck is then shut down.

 2004 Microchip Technology Inc. Preliminary DS39646B-page 47

PIC18F8722 FAMILY

3.5.4 EXIT WITHOUT AN OSCILLATOR START-UP DELAY

Certain exits from power-managed modes do not invoke the OST at all. There are two cases:

• PRI_IDLE mode, where the primary clock source

is not stopped and

• the primary clock source is not any of the LP, XT,

HS or HSPLL modes.

In these instances, the primary clock source either does not require an oscillator start-up delay since it is already running (PRI_IDLE), or normally does not require an oscillator start-up delay (RC, EC and INTIO Oscillator modes). However, a fixed delay of interval

CSD following the wake event is still required when

T leaving Sleep and Idle modes to allow the CPU to prepare for execution. Instruction execution resumes on the first clock cycle following this delay.

TABLE 3-2: EXIT DELAY ON WAKE-UP BY RESET FROM SLEEP MODE OR ANY IDLE MODE

(BY CLOCK SOURCES)

Clock Source

before Wake-up

Primary Device Clo ck

(PRI_IDLE mode)

T1OSC or INTRC

INTOSC

(Sleep mode)

Note 1: TCSD (parameter 38, Table 28-12) is a required delay whe n waking from Sleep and all Idle modes an d runs

concurrently with any other required delays (see Section 3.4 “Idle Modes”).

2: Includes both the INTOSC 8MHz source and postscaler deriv ed frequ encie s. On Res et, INT OSC defaults

to 1 MHz.

3: T

(parameter F12, Table 28-7); it is also designated as T

4: Execution continues during T

(2)

None

OST is the Oscillator Start-up Timer (parameter 32, Table 28-12). t

Clock Source

after Wake-up

Exit Delay

Clock Ready Status

Bit (OSCCON)

LP, XT, HS

HSPLL

EC, RC

INTOSC

(2)

LP, XT, HS TOST

EC, RC TCSD

INTOSC

(2)

LP, XT, HS TOST

EC, RC TCSD

INTOSC

(2)

LP, XT, HS TOST

EC, RC TCSD

INTOSC

IOBST (parameter 39, Table28-12), the INTOSC stabilization period.

(2)

PLL.

(1)

CSD

(3)

(1)

(4)

TIOBST

(4)

(3)

(1)

None IOFS

(3)

(1)

(4)

TIOBST

is the PLL Lock-out Tim er

OSTS

IOFS

OSTSHSPLL TOST + t

IOFS

OSTSHSPLL TOST + t

IOFS

DS39646B-page 48 Preliminary  2004 Microchip Technology Inc.

PIC18F8722 FAMILY

4.0 RESET

A simplified block di agram of the On-Chip Reset Circu it is shown in Figure 4-1.

The PIC18F8722 family of devices differentiates between various kinds of Reset:

a) Power-on Reset (POR) b) MCLR

Reset during normal operation c) MCLR Reset during power-managed modes d) Watchdog Timer (WDT) Reset (during

execution) e) Programmable Brown-out Reset (BOR) f) RESET I nstruction g) Stack Full Reset h) Stack Underflow Reset

This section discusses Resets generated by MCLR POR and BOR and covers the ope rati on o f the various start-up timers. Stack Reset events are covered in Section 5.1.3.4 “Stack Full and Underflow Resets”. WDT Resets are co v ere d i n Section 25.2 “Watchdog

4.1 RCON Register

Device Reset events are tracked through the RCON register (Register 4-1). The lower five bits of the register indicate that a specif ic Reset eve nt has occu rred. In most cases, thes e bits c an only be cl eared by the e vent and must be set by the applic at ion afte r the e ve nt. Th e state of these flag bits, taken together, can be read to indicate the type of Reset that just occurred. This is described in more detail in Sect ion 4.6 “R eset State of Registers”.

The RCON register also has control bits for setting interrupt priority (IPEN) and software control of the BOR (SBOREN). Interrupt priority is discussed in

Section 10.0 “Interrupts”. BOR is covered in Section 4.4 “Brown-out Reset (BOR)”.

Timer (WDT)”.

FIGURE 4-1: SIMPLIFIED BLOCK DIAGRAM OF ON-CHIP RESET CIRCUIT

RESET

Instruction

MCLR

VDD

OSC1

Stack

Pointer

( )_IDLE

Sleep

WDT

Time-out

DD Rise

Detect

Brown-out

Reset

OST/PWRT

31 µs

(1)

INTRC

Stack Full/Underflow Reset

External Reset

MCLRE

POR Pulse

BOREN

OST

PWRT

1024 Cycles

10-bit Ripple Counter

64 ms

11-bit Ripple Counter

Chip_Reset

Enable PWRT

Enable OST

Note 1: This is the INTRC source from the internal oscillator block and is separate from the RC oscillator of the CLKI pin.

2: See Table 4-2 for time-out situations.

 2004 Microchip Technology Inc. Preliminary DS39646B-page 49

(2)

PIC18F8722 FAMILY

REGISTER 4-1: RCON: RESET CONTROL REGISTER

R/W-0 R/W-1

IPEN SBOREN

bit 7 bit 0

bit 7 IPEN: Interrupt Priority Enable bit

1 = Enable priority levels on interrupts 0 = Disable priority levels on interrupts (PIC16CXXX Compatibility mode)

bit 6 SBOREN: BOR Software Enable bit

If BOREN1:BOREN0 = 01:

1 = BOR is enabled 0 = BOR is disabled

If BOREN1:BOREN0 =

Bit is disabled and read as ‘0’. bit 5 Unimplemented: Read as ‘0’ bit 4 RI: RESET Instruction Flag bit

1 = The RESET instruction was not executed (set by firmware only)

0 = The RESET instruction was executed causing a device Reset (must be set in software after

a Brown-out Reset occurs)

bit 3 TO: Watchdog Time-out Flag bit

1 = Set by power-up, CLRWDT instruction or SLEEP instruction

0 = A WDT time-out occurred

bit 2 PD

bit 1 POR

bit 0 BOR

: Power-down Detection Flag bit

1 = Set by power-up or by the CLRWDT instruction

0 = Set by execution of the SLEEP instruction

: Power-on Reset Status bit

1 = A Power-on Reset has not occurred (set by firmware only)

0 = A Power-on Reset occurred (must be set in software after a Power-on Reset occurs)

: Brown-out Reset Status bit

1 = A Brown-out Reset has not occurred (set by firmware only)

0 = A Brown-out Reset occurred (must be set in software after a Brown-out Reset occurs)

(1)

00, 10 or 11:

U-0 R/W-1 R-1 R-1 R/W-0

—RITO PD POR BOR

(1)

(2)

R/W-0

Note 1: If SBOREN is enabled, its Reset state is ‘1’; otherwise, it is ‘0’.

2: The actual Reset val ue o f POR

notes following this register and Section 4.6 “Reset State of Registers” for additional information.

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

Note 1: It is recommended that the POR bit be set after a Power-on Reset has been

detected so that subsequent Power-on Resets may be detected.

2: Brown-out Reset is said to have occurred when BOR is ‘0’ and POR is ‘1’ (assumin g

that POR

DS39646B-page 50 Preliminary  2004 Microchip Technology Inc.

was set to ‘1’ by software immediately after POR).

is determined by the t ype of device Reset. See the

PIC18F8722 FAMILY

4.2 Master Clear (MCLR)

The MCLR pin provides a method for triggering an external Reset of the device. A Reset is generated by holding the pin low. These devices h ave a nois e filter in the MCLR

Reset path which detects and ignores small

pulses. The MCLR

pin is not drive n low by any inter nal Reset s,

including the WDT. In the PIC18F8722 family of devices, the MCLR

input can be disabled with the MCLRE configuration bit. When MCLR is disabled, the pin becomes a digital input. See Section 11.5 “PORTE, TRISE and LATE

Registers” for more information.

4.3 Power-on Reset (POR)

A Power-on Reset pulse is generated on-chip whenever V allows the device to start in the initialized state when VDD is adequate for operation.

T o t ake advantage o f the POR circuitry , tie the MCLR through a resistor (1 kΩ to 10 kΩ) to V eliminate external RC components usually needed to create a Power-on Reset delay . A minimu m rise rate for

DD is specified (parameter D004, “Section 28.2 “DC

V Characteristics: Power-Down and Supply Current”). For a slow rise time, see Figure 4-2.

When the device st arts normal operation (i.e., exits the Reset condition), device operating parameters (voltage, frequency, temperature, etc.) must be met to ensure operation. If these conditions are not met, the device must be held in Reset until the operating conditions are met.

POR events are captured by the POR The state of the bit is set to ‘0’ whe never a POR occurs; it does not change for any other Reset event. POR is not reset to ‘1’ by any hardware event. To capture multiple events, the user manually resets the bit to ‘1’ in software following any POR.

DD rises above a certain threshold. This

DD. This will

bit (RCON<1>).

FIGURE 4-2: EXTERNAL POWER-ON

RESET CIRCUIT (FOR SLOW V

VDD

Note 1: External Power-on Res et circuit is required

2: R < 40 kΩ is recommended to make sure that

3: R1 ≥ 1 kΩ will limit any current flowing into

(2)

only if the V The diode D helps discharge the capacitor quickly when V

the voltage drop across R does not violate the device’s electrical specification.

MCLR of MCLR Electrostatic Discharge (ESD) or Electrical Overstress (EOS).

DD power-up slope is too slow.

from external capacitor C, in the event

/VPP pin breakdown, due to

DD POWER-UP)

(3)

MCLR

PIC18FXXXX

DD powers down.

(1)

 2004 Microchip Technology Inc. Preliminary DS39646B-page 51

PIC18F8722 FAMILY

4.4 Brown-out Reset (BOR)

The PIC18F 87 22 f am il y of de vi ce s imp l em ents a BOR circuit that provides the user with a number of configuration and power-saving options. The BOR is controlled by the BORV1:BORV0 and BOREN1:BOREN0 configuration bits. There are a total of four BOR configurations which are summarized in Table 4-1.

The BOR threshold is set by t he BOR V1:BOR V0 bit s. If BOR is enabled (any values of BOREN1:BOREN0, except ‘00’), any drop of V D005, Section 28.1 “DC Characteristics”) for greater than TBOR (parameter 35, Table 28-12) will reset the device. A Reset m ay or may not occur if V

BOR for less than TBOR. The chip will remain in

V Brown-out Reset until V

If the Power-up T imer is enabl ed, it will be inv oked after

DD rises above VBOR; it then will keep the chip in

V Reset for an additional time delay, T (parameter 33, Table 28-12). If VDD drops below VBOR while the Power-up Timer is running, the chip will go back into a Brown-out Reset and the Power-up Timer will be initialized. Once VDD rises above VBOR, the Power-up Timer will execute the additional time delay.

BOR and the Power-on Timer (PWRT) are independently configured. Enabling BOR Reset does not automatically enable the PWRT.

4.4.1 SOFTWARE ENABLED BOR

When BOREN1:BOREN0 = 01, the BOR can be enabled or disabled by the user in software. This is done with the control bit, SBOREN (RCON<6>). Setting SBOREN enables the BOR to function as previously described. Clearing SBOREN disables the BOR entirely. The SBOREN bit operates only in this mode; otherwise it is re ad as ‘0’.

DD below VBOR (parameter

DD falls below

DD rises above VBOR.

PWRT

Placing the BOR under software control gives the user the additional flexibility of tailoring the application to its environment withou t ha vi ng to reprogram the device to change the BOR configuration. It also allows the user to tailor device power consumption in software by eliminating the incremental current that the BOR consumes. While the BOR current is typically very small, it may have some impact in low-power applications.

Note: Even when BOR is under softwa re contro l,

the BOR Reset voltage level is still set by the BORV1:BORV0 configuration bits. It cannot be changed in software.

4.4.2 DETECTING BOR

When BOR is enab led, the BO R bit always resets to ‘0’ on any BOR or P OR event. This makes it diff icult to determine if a BOR event has occurre d jus t by rea ding the state of BOR simultaneously check the state of both POR This assumes th at the POR immediately after any POR event. If BOR POR

is ‘1’, it can be reliably assum ed that a BOR event

has occurred.

alone. A more reliable method is to

and BOR.

bit is reset to ‘1’ in softwa re

is ‘0’ while

4.4.3 DISABLING BOR IN SLEEP MODE

When BOREN1:BOREN0 = 10, the BOR remains under hardware control and operates as previously described. Whenever the device enters Sleep mode, however , the BOR is au tom ati ca lly dis abl ed . When the device returns to any other operating mode, BOR is automatically re-enabled.

This mode allows for applications to recover from brown-out situations, while actively executing code, when the device requires BOR protection the most. At the same time, it save s additional po wer in Sleep mod e by eliminating the small incremental BOR current.

TABLE 4-1: BOR CONFIGURATIONS

BOR Configuration Status of

BOREN1 BOREN0

00Unavailable BOR disabled; must be enabled by reprogramming the configuration bits. 01Available BOR enabled in software; operation controlled by SBOREN. 10Unavailable BOR enabled in hardware in Run and Idle modes, disabled during

11Unavailable BOR enabled in hardware; must be disabled by reprogramming the

DS39646B-page 52 Preliminary  2004 Microchip Technology Inc.

SBOREN

(RCON<6>)

Sleep mode.

configuration bits.

BOR Operation

PIC18F8722 FAMILY

4.5 Device Reset Timers

The PIC18F8722 family of devices incorporates three separate on-chip timers that help regulate the Power-on Reset process. Their main function is to ensure that the device clock is stable before code is executed. These timers are:

• Power-up Timer (PWRT)

• Oscillator Start-up Timer (OST)

• PLL Lock Time-out

4.5.1 POWER-UP TIMER (PWRT)

The Power-up Timer (PWRT) of the PIC18F8722 family of devices is an 11-bit counter which uses the INTRC source as the clock input. While the PWRT is counting, the device is held in Reset.

The power-up time delay depe nd s on the INTRC cl oc k and will vary from chip-to-chip due to temperature and process variation. See DC parameter 33 in Table 28-12 for details.

The PWRT is enabled by clearing the PWRTEN configuration bit.

4.5.2 OSCILLATOR START-UP TIMER

(OST)

The Oscillator Start-up Timer (OST) provides a 1024 oscillator cycle (from OSC1 input) delay after the PWRT delay is over (parameter 33, Table 28-12). This ensures that the crystal oscillator or resonator has started and stabilized.

The OST time-out is invoked only for XT, LP, HS and HSPLL modes and only on Power-on Reset, or on exit from most power-manag ed mod e s.

4.5.3 PLL LOCK TIME-OUT

With the PLL enabled in its PLL mode, the time-out sequence following a Power-on Reset is slightly different from other oscillator modes. A separate timer is used to provide a fixed time-out that is suf fi ci ent fo r th e PLL to lock to the main oscillator frequency. This PLL lock time-o ut (T oscillator start-up time-out.

PLL) is typically 2 ms and follows the

4.5.4 TIME-OUT SEQUENCE

On power-up, the time-out sequence is as follows:

1. After the POR pulse has cleared, PWRT time-out is invoked (if enabled).

2. Then, the OST is activated.

The total time-out will vary based on oscillator configuration and the status of the PWRT. Figure 4-3, Figure 4-4, Figure 4-5, Figure 4-6 and Figure 4-7 all depict time-out sequences on power-up, with the Power-up Timer enabled and the device operating in HS Oscillator mode. Figures 4-3 through 4-6 also apply to devices operating in XT or LP modes. For devices in RC mode and with the PWRT disabled, on the other hand, there will be no time-out at all.

Since the time-outs occur from the POR pulse, if MC LR is kept low long e nough, all ti me -out s will e xpire. Brin ging MCLR (Figure 4-5). This is useful for testing purposes or to synchronize more than one PIC18F8722 family device operating in parallel.

high will begin execution immediately

TABLE 4-2: TIME-OUT IN VARIOUS SITUATIONS

(2)

Oscillator

Configuration

HSPLL TPWRT HS, XT, LP TPWRT EC, ECIO TPWRT RC, RCIO TPWRT INTIO1, INTIO2 TPWRT

Note 1: See parameter 33, Ta ble 28-12.

2: 2 ms is the nominal time required for the PLL to lock.

 2004 Microchip Technology Inc. Preliminary DS39646B-page 53

PWRTEN

(1)

+ 1024 TOSC + TPLL

Power-up

= 0 PWRTEN = 1

(1)

+ 1024 TOSC 1024 TOSC 1024 TOSC

(1) (1) (1)

and Brown-out

(2)

1024 TOSC + TPLL

Exit from

Power-Managed Mode

(2)

—— —— ——

1024 TOSC + TPLL

(2)

PIC18F8722 FAMILY

FIGURE 4-3: TIME-OUT SEQUENCE ON POWER-UP (MCLR TIED TO VDD, VDD RISE < TPWRT)

VDD

MCLR

INTERNAL POR

TPWRT

PWRT TIME-OUT

OST TIME-OUT

INTERNAL RESET

TOST

FIGURE 4-4: TIME-OUT SEQUENCE ON POWER-UP (MCLR

VDD

MCLR

INTERNAL POR

PWRT TI ME-OUT

OST TIME-OUT

INTERNAL RESET

TPWRT

NOT TIED TO VDD): CASE 1

TOST

FIGURE 4-5: TIME-OUT SEQUENCE ON POWER-UP (MCLR

VDD

MCLR

INTERNAL POR

TPWRT

PWRT TIME-OUT

OST TIME-OUT

INTERNAL RESET

DS39646B-page 54 Preliminary  2004 Microchip Technology Inc.

NOT TIED TO VDD): CASE 2

TOST

PIC18F8722 FAMILY

FIGURE 4-6: SLOW RISE TIME (MCLR TIED TO VDD, VDD RISE > TPWRT)

VDD

MCLR

INTERNAL POR

TPWRT

PWRT TIME-OUT

OST TIME-OUT

INTERNAL RESET

TOST

FIGURE 4-7: TIME-OUT SEQUENCE ON POR w/PLL ENABLED (MCLR TIED TO VDD)

VDD

MCLR

INTERNAL POR

TPWRT

PWRT TIME-OUT

OST TIME-OUT

PLL TIME-OUT

TOST

TPLL

INTERNAL RESET

Note: TOST = 1024 clock cycles.

PLL ≈ 2 ms is the nominal time required for the PLL to lock.

 2004 Microchip Technology Inc. Preliminary DS39646B-page 55

PIC18F8722 FAMILY

4.6 Reset State of Registers

Most registers are unaffected by a Reset. Their status is unknown on POR and unchanged by all other

Table 4-4 describes the Reset states for all of the Special Function Registers. These are categorized by Power-on and Brown-out Resets, Master Clear and WDT Resets and WDT wake-ups.

Resets. All othe r reg is ters are forced to a “Reset state” depending on the type of Reset that occurred.

Most registers are not affected by a WDT wake-up, since this is viewed as the resumption of normal operation. Status bits from the RCON register, RI POR

and BOR, are set or cleare d dif ferently i n differe nt

, TO, PD,

Reset situations, as indicated in Table 4-3. These bits are used in software to determine the nature of the Reset.

TABLE 4-3: STATUS BITS, THEIR SIGNIFICANCE AND THE INITIALIZATION CONDITION

FOR RCON REGISTER

Condition

Program

Counter

SBOREN RI TO PD POR BOR STKFUL STKUNF

Power-on Reset 0000h 1 11100 0 0 RESET Instruction 0000h u

Brown-out Reset 0000h u

during Power-Managed

MCLR

0000h u

(2) (2) (2)

Run Modes MCLR during Power-Managed

0000h u

(2)

Idle Modes and Sleep Mode WDT Time-out during Full Power

0000h u

(2)

or Power-Managed Run Mode MCLR during Full Power

0000h u

(2)

Execution Stack Full Reset (STVREN = 1) 0000h u Stack Underflow Reset

0000h u

(2) (2)

(STVREN = 1) Stack Underflow Error (not an

0000h u

(2)

actual Reset, STVREN = 0) WDT Time-out during

PC + 2 u

(2)

Power-Managed Idle or Sleep Modes

Interrupt Exit from

PC + 2

(1)

(2)

Power-Managed Modes

Legend: u = unchanged Note 1: When the wake-up is due to an interrupt and the GIEH or GIEL bits are set, the PC is loaded with the

interrupt vector (008h or 0018h).

2: Reset state is ‘1’ for POR and unchanged for all other Resets when software BOR is enabled

(BOREN1:BOREN0 configuration bits = 01 and SBOREN = 1). O therwise, t he Reset state is ‘0’.

RCON Register STKPTR Register

0uuuu u u

111u0 u u

u1uuu u u

u10uu u u

u0uuu u u

uuuuu u u

uuuuu 1 u

uuuuu u 1

u00uu u u

uu0uu u u

DS39646B-page 56 Preliminary  2004 Microchip Technology Inc.

PIC18F8722 FAMILY

TABLE 4-4: INITIALIZATION CONDITIONS FOR ALL REGISTERS

MCLR

TOSU 6X27 6X22 8X27 8X22 ---0 0000 ---0 0000 ---0 uuuu TOSH 6X27 6X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu TOSL 6X27 6X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu STKPTR 6X27 6X22 8X27 8X22 00-0 0000 uu-u uuuu uu-u uuuu PCLATU 6X 27 6X22 8X27 8X22 ---0 0000 ---0 0000 ---u uuuu PCLATH 6X 27 6X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu PCL 6X27 6X22 8X27 8X22 0000 0000 0000 0000 PC + 2 TBLPTRU 6X27 6X22 8X27 8X22 --00 0000 --00 0000 --uu uuuu TBLPTRH 6X27 6X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu TBLPTRL 6X27 6X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu TABLAT 6X27 6X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu PRODH 6X27 6X22 8X27 8X22 xxxx xxxx uuuu uuuu uuuu uuuu PRODL 6X27 6X22 8X27 8X22 xxxx xxxx uuuu uuuu uuuu uuuu INTCON 6X27 6 X22 8X27 8X22 0000 000x 0000 000u uuuu uuuu INTCON2 6X27 6X22 8X27 8X22 1111 1111 1111 1111 uuuu uuuu INTCON3 6X27 6X22 8X27 8X22 1100 0000 1100 0000 uuuu uuuu INDF0 6X27 6X22 8X27 8X22 N/A N/A N/A POSTINC0 6X27 6X22 8X27 8X22 N/A N/A N/A POSTDEC0 6X27 6X22 8X27 8X22 N/A N/A N/A PREINC0 6X27 6X22 8X27 8X22 N/A N/A N/A PLUSW0 6X27 6X22 8X27 8X22 N/A N/A N/A FSR0H 6X27 6X22 8X27 8X22 ---- 0000 ---- 0000 ---- uuuu FSR0L 6X27 6X22 8X27 8X22 xxxx xxxx uuuu uuuu uuuu uuuu WREG 6X27 6X22 8X27 8X22 xxxx xxxx uuuu uuuu uuuu uuuu INDF1 6X27 6X22 8X27 8X22 N/A N/A N/A POSTINC1 6X27 6X22 8X27 8X22 N/A N/A N/A POSTDEC1 6X27 6X22 8X27 8X22 N/A N/A N/A PREINC1 6X27 6X22 8X27 8X22 N/A N/A N/A PLUSW1 6X27 6X22 8X27 8X22 N/A N/A N/A Legend: u = unchanged, x = unknown, - = unimplemented bit, read as ‘0’, q = value depends on condition.

Shaded cells indicate conditions do not apply for the designated device.

Note 1: One or more bits in the INTCONx or PIRx registers will be affected (to cause wake-up).

2: When the wake-up is due to an interrupt and the GIEL or GIEH bit is set, the PC is loaded with the interrupt vector

(0008h or 0018h).

3: When the wake-up is due to an interrupt and the GIEL or GIEH bit is set, the TOSU, TOSH and TOSL are updated with

the current value of the PC. The STKPTR is modified to point to the next location in the hardware stack.

4: See Table4-3 for Reset value for specific condition. 5: Bits 6 and 7 of PORTA, LATA and TRISA are enabled, depending on the oscillator mode selected. When not enabled

as PORTA pins, they are disabled and read ‘0’.

Power-on Reset, Brown-out Reset

RESET Instruction,

Resets,

WDT Reset,

Stack Resets

Wake-up via WDT

or Interrupt

(3) (3) (3) (3)

(2)

(1) (1) (1)

 2004 Microchip Technology Inc. Preliminary DS39646B-page 57

PIC18F8722 FAMILY

TABLE 4-4: INITIALIZATION CONDITIONS FOR ALL REGISTERS (CONTINUED)

MCLR

FSR1H 6X27 6X22 8X27 8X22 ---- 0000 ---- 0000 ---- uuuu FSR1L 6X27 6X22 8X27 8X22 xxxx xxxx uuuu uuuu uuuu uuuu BSR 6X27 6X22 8X27 8X22 ---- 0000 ---- 0000 ---- uuuu INDF2 6X27 6X22 8X27 8X22 N/A N/A N/A POSTINC2 6X27 6X22 8X27 8X22 N/A N/A N/A POSTDEC2 6X27 6X22 8X27 8X22 N/A N/A N/A PREINC2 6X27 6X22 8X27 8X22 N/A N/A N/A PLUSW2 6X27 6X22 8X27 8X22 N/A N/A N/A FSR2H 6X27 6X22 8X27 8X22 ---- 0000 ---- 0000 ---- uuuu FSR2L 6X27 6X22 8X27 8X22 xxxx xxxx uuuu uuuu uuuu uuuu STATUS 6X27 6X22 8X27 8X22 ---x xxxx ---u uuuu ---u uuuu TMR0H 6X27 6X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu TMR0L 6X27 6X22 8X27 8X22 xxxx xxxx uuuu uuuu uuuu uuuu T0CON 6X27 6X22 8X27 8X22 1111 1111 1111 1111 uuuu uuuu OSCCON 6X27 6X22 8X27 8X22 0100 q000 0100 q000 uuuu uuqu HLVDCON 6X27 6X22 8X27 8X22 0-00 0101 0-00 0101 u-uu uuuu WDTCON 6X27 6X22 8X27 8X22 ---- ---0 ---- ---0 ---- ---u

(4)

RCON TMR1H 6X27 6X22 8X27 8X22 xxxx xxxx uuuu uuuu uuuu uuuu TMR1L 6X27 6X22 8X27 8X22 xxxx xxxx uuuu uuuu uuuu uuuu T1CON 6X27 6X22 8X27 8X22 0000 0000 u0uu uuuu uuuu uuuu TMR2 6X27 6X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu PR2 6X27 6X22 8X27 8X22 1111 1111 uuuu uuuu uuuu uuuu T2CON 6X27 6X22 8X27 8X22 -000 0000 -000 0000 -uuu uuuu SSP1BUF 6X27 6X22 8X27 8X22 xxxx xxxx uuuu uuuu uuuu uuuu SSP1ADD 6X27 6X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu SSP1STAT 6X27 6X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu SSP1CON1 6X27 6X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu SSP1CON2 6X27 6X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu

Legend: u = unchanged, x = unknown, - = unimplemented bit, read as ‘0’, q = value depends on condition.

Note 1: One or more bits in the INTCONx or PIRx registers will be affected (to cause wake-up).

Shaded cells indicate conditions do not apply for the designated device.

2: When the wake-up is due to an interrupt and the GIEL or GIEH bit is set, the PC is loaded with the interrupt vector

(0008h or 0018h).

3: When the wake-up is due to an interrupt and the GIEL or GIEH bit is set, the TOSU, TOSH and TOSL are updated with

the current value of the PC. The STKPTR is modified to point to the next location in the hardware stack.

4: See Table4-3 for Reset value for specific condition. 5: Bits 6 and 7 of PORTA, LATA and TRISA are enabled, depending on the oscillator mode selected. When not enabled

as PORTA pins, they are disabled and read ‘0’.

6X27 6X22 8X27 8X22 0q-1 11q0 0q-q qquu uq-u qquu

Power-on Reset, Brown-out Reset

RESET Instruction,

Resets,

WDT Reset,

Stack Resets

Wake-up via WDT

or Interrupt

DS39646B-page 58 Preliminary  2004 Microchip Technology Inc.

PIC18F8722 FAMILY

TABLE 4-4: INITIALIZATION CONDITIONS FOR ALL REGISTERS (CONTINUED)

MCLR

ADRESH 6X27 6X22 8X27 8X22 xxxx xxxx uuuu uuuu uuuu uuuu ADRESL 6X27 6X22 8X27 8X22 xxxx xxxx uuuu uuuu uuuu uuuu ADCON0 6X27 6X22 8X27 8X22 --00 0000 --00 0000 --uu uuuu ADCON1 6X27 6X22 8X27 8X22 --00 0000 --00 0000 --uu uuuu ADCON2 6X27 6X22 8X27 8X22 0-00 0000 0-00 0000 u-uu uuuu CCPR1H 6X27 6X22 8X27 8X22 xxxx xxxx uuuu uuuu uuuu uuuu CCPR1L 6X27 6X22 8X27 8X22 xxxx xxxx uuuu uuuu uuuu uuuu CCP1CON 6X27 6X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu CCPR2H 6X27 6X22 8X27 8X22 xxxx xxxx uuuu uuuu uuuu uuuu CCPR2L 6X27 6X22 8X27 8X22 xxxx xxxx uuuu uuuu uuuu uuuu CCP2CON 6X27 6X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu CCPR3H 6X27 6X22 8X27 8X22 xxxx xxxx uuuu uuuu uuuu uuuu CCPR3L 6X27 6X22 8X27 8X22 xxxx xxxx uuuu uuuu uuuu uuuu CCP3CON 6X27 6X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu ECCP1AS 6X2 7 6X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu CVRCON 6X27 6X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu CMCON 6X27 6X22 8X27 8X22 0000 0111 0000 0111 uuuu uuuu TMR3H 6X27 6X22 8X27 8X22 xxxx xxxx uuuu uuuu uuuu uuuu TMR3L 6X27 6X22 8X27 8X22 xxxx xxxx uuuu uuuu uuuu uuuu T3CON 6X27 6X22 8X27 8X22 0000 0000 uuuu uuuu uuuu uuuu PSPCON 6X27 6X22 8X27 8X22 0000 ---- 0000 ---- uuuu ---- SPBRG1 6X27 6 X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu RCREG1 6X27 6X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu TXREG1 6X27 6X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu TXSTA1 6X27 6X22 8X2 7 8X22 0000 0010 0000 0010 uuuu uuuu RCSTA1 6X27 6X22 8X27 8X22 0000 000x 0000 000x uuuu uuuu EEADRH 6X27 6X22 8X27 8X22 ---- --00 ---- --00 ---- --uu EEADR 6X27 6X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu EEDATA 6X27 6X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu EECON2 6X27 6X22 8X27 8X22 0000 0000 0000 0000 0000 0000 EECON1 6X27 6X22 8X27 8X22 xx-0 x000 uu-0 u000 uu-u uuuu Legend: u = unchanged, x = unknown, - = unimplemented bit, read as ‘0’, q = value depends on condition.

Shaded cells indicate conditions do not apply for the designated device.

Note 1: One or more bits in the INTCONx or PIRx registers will be affected (to cause wake-up).

2: When the wake-up is due to an interrupt and the GIEL or GIEH bit is set, the PC is loaded with the interrupt vector

(0008h or 0018h).

3: When the wake-up is due to an interrupt and the GIEL or GIEH bit is set, the TOSU, TOSH and TOSL are updated with

the current value of the PC. The STKPTR is modified to point to the next location in the hardware stack.

4: See Table4-3 for Reset value for specific condition. 5: Bits 6 and 7 of PORTA, LATA and TRISA are enabled, depending on the oscillator mode selected. When not enabled

as PORTA pins, they are disabled and read ‘0’.

Power-on Reset, Brown-out Reset

RESET Instruction,

Resets,

WDT Reset,

Stack Resets

Wake-up via WDT

or Interrupt

 2004 Microchip Technology Inc. Preliminary DS39646B-page 59

PIC18F8722 FAMILY

TABLE 4-4: INITIALIZATION CONDITIONS FOR ALL REGISTERS (CONTINUED)

MCLR

Power-on Reset, Brown-out Reset

RESET Instruction,

IPR3 6X27 6X22 8X27 8X22 1111 1111 1111 1111 uuuu uuuu PIR3 6X27 6X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu PIE3 6X27 6X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu IPR2 6X27 6X22 8X27 8X22 11-1 1111 11-1 1111 uu-u uuuu PIR2 6X27 6X22 8X27 8X22 00-0 0000 00-0 0000 uu-u uuuu PIE2 6X27 6X22 8X27 8X22 00-0 0000 00-0 0000 uu-u uuuu IPR1 6X27 6X22 8X27 8X22 1111 1111 1111 1111 uuuu uuuu PIR1 6X27 6X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu PIE1 6X27 6X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu MEMCON

6X27 6X22 8X27 8X22 0-00 --00 0-00 --00 u-uu --uu OSCTUNE 6X27 6X22 8X27 8X22 00-0 0000 00-0 0000 uu-u uuuu TRISJ TRISH

6X27 6X22 8X27 8X22 1111 1111 1111 1111 uuuu uuuu

6X27 6X22 8X27 8X22 1111 1111 1111 1111 uuuu uuuu TRISG 6X27 6X22 8X27 8X22 ---1 1111 ---1 1111 ---u uuuu TRISF 6X27 6X22 8X27 8X22 1111 1111 1111 1111 uuuu uuuu TRISE 6X27 6X22 8X27 8X22 1111 1111 1111 1111 uuuu uuuu TRISD 6X27 6X22 8X27 8X22 1111 1111 1111 1111 uuuu uuuu TRISC 6X27 6X22 8X27 8X22 1111 1111 1111 1111 uuuu uuuu TRISB 6X27 6X22 8X27 8X22 1111 1111 1111 1111 uuuu uuuu TRISA

(5)

6X27 6X22 8X27 8X22 1111 1111

(5)

LATJ 6X27 6X22 8X27 8X22 xxxx xxxx uuuu uuuu uuuu uuuu LATH

6X27 6X22 8X27 8X22 xxxx xxxx uuuu uuuu uuuu uuuu LATG 6X27 6X22 8X27 8X22 --xx xxxx --uu uuuu --uu uuuu LATF 6X27 6X22 8X27 8X22 xxxx xxxx uuuu uuuu uuuu uuuu LATE 6X27 6X22 8X27 8X22 xxxx xxxx uuuu uuuu uuuu uuuu LATD 6X27 6X22 8X27 8X22 xxxx xxxx uuuu uuuu uuuu uuuu LATC 6X27 6X22 8X27 8X22 xxxx xxxx uuuu uuuu uuuu uuuu LATB 6X27 6X22 8X27 8X22 xxxx xxxx uuuu uuuu uuuu uuuu LATA

(5)

6X27 6X22 8X27 8X22 xxxx xxxx

(5)

PORTJ 6X27 6X22 8X27 8X22 xxxx xxxx uuuu uuuu uuuu uuuu PORTH

6X27 6X22 8X27 8X22 0000 xxxx uuuu uuuu uuuu uuuu PORTG 6X27 6X22 8X27 8X22 --xx xxxx --uu uuuu --uu uuuu PORTF 6X27 6X22 8X27 8X22 x000 0000 u000 0000 uuuu uuuu PORTE 6X27 6X22 8X27 8X22 xxxx xxxx uuuu uuuu uuuu uuuu PORTD 6X27 6X22 8X27 8X22 xxxx xxxx uuuu uuuu uuuu uuuu PORTC 6X27 6X22 8X27 8X22 xxxx xxxx uuuu uuuu uuuu uuuu PORTB 6X27 6X22 8X27 8X22 xxxx xxxx uuuu uuuu uuuu uuuu Legend: u = unchanged, x = unknown, - = unimplemented bit, read as ‘0’, q = value depends on condition.

Shaded cells indicate conditions do not apply for the designated device.

Note 1: One or more bits in the INTCONx or PIRx registers will be affected (to cause wake-up).

2: When the wake-up is due to an interrupt and the GIEL or GIEH bit is set, the PC is loaded with the interrupt vector

(0008h or 0018h).

3: When the wake-up is due to an interrupt and the GIEL or GIEH bit is set, the TOSU, TOSH and TOSL are updated with

the current value of the PC. The STKPTR is modified to point to the next location in the hardware stack.

4: See Table4-3 for Reset value for specific condition. 5: Bits 6 and 7 of PORTA, LATA and TRISA are enabled, depending on the oscillator mode selected. When not enabled

as PORTA pins, they are disabled and read ‘0’.

Resets,

WDT Reset,

Stack Resets

1111 1111

uuuu uuuu

Wake-up via WDT

or Interrupt

(5)

uuuu uuuu

(1)

(5)

DS39646B-page 60 Preliminary  2004 Microchip Technology Inc.

PIC18F8722 FAMILY

TABLE 4-4: INITIALIZATION CONDITIONS FOR ALL REGISTERS (CONTINUED)

MCLR

(5)

PORTA SPBRGH1 6X 27 6X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu BAUDCON1 6X27 6X22 8X2 7 8X22 01-0 0-00 01-0 0-00 uu-u u-uu SPBRGH2 6X 27 6X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu BAUDCON2 6X27 6X22 8X2 7 8X22 01-0 0-00 01-0 0-00 uu-u u-uu ECCP1DEL 6X27 6X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu TMR4 6X27 6X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu PR4 6X27 6X22 8X27 8X22 1111 1111 uuuu uuuu uuuu uuuu T4CON 6X27 6X22 8X27 8X22 -000 0000 -000 0000 -uuu uuuu CCPR4H 6X27 6X22 8X27 8X22 xxxx xxxx uuuu uuuu uuuu uuuu CCPR4L 6X27 6X22 8X27 8X22 xxxx xxxx uuuu uuuu uuuu uuuu CCP4CON 6X27 6X22 8X27 8X22 --00 0000 --00 0000 --uu uuuu CCPR5H 6X27 6X22 8X27 8X22 xxxx xxxx uuuu uuuu uuuu uuuu CCPR5L 6X27 6X22 8X27 8X22 xxxx xxxx uuuu uuuu uuuu uuuu CCP5CON 6X27 6X22 8X27 8X22 --00 0000 --00 0000 --uu uuuu SPBRG2 6X27 6 X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu RCREG2 6X27 6X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu TXREG2 6X27 6X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu TXSTA2 6X27 6X22 8X2 7 8X22 0000 0010 0000 0010 uuuu uuuu RCSTA2 6X27 6X22 8X27 8X22 0000 000x 0000 000x uuuu uuuu ECCP3AS 6X2 7 6X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu ECCP3DEL 6X27 6X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu ECCP2AS 6X2 7 6X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu ECCP2DEL 6X27 6X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu SSP2BUF 6X27 6X22 8X27 8X22 xxxx xxxx uuuu uuuu uuuu uuuu SSP2ADD 6X27 6X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu SSP2STAT 6X27 6X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu SSP2CON1 6X27 6X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu SSP2CON2 6X27 6X22 8X27 8X22 0000 0000 0000 0000 uuuu uuuu Legend: u = unchanged, x = unknown, - = unimplemented bit, read as ‘0’, q = value depends on condition.

Shaded cells indicate conditions do not apply for the designated device.

Note 1: One or more bits in the INTCONx or PIRx registers will be affected (to cause wake-up).

2: When the wake-up is due to an interrupt and the GIEL or GIEH bit is set, the PC is loaded with the interrupt vector

(0008h or 0018h).

3: When the wake-up is due to an interrupt and the GIEL or GIEH bit is set, the TOSU, TOSH and TOSL are updated with

the current value of the PC. The STKPTR is modified to point to the next location in the hardware stack.

4: See Table4-3 for Reset value for specific condition. 5: Bits 6 and 7 of PORTA, LATA and TRISA are enabled, depending on the oscillator mode selected. When not enabled

as PORTA pins, they are disabled and read ‘0’.

6X27 6X22 8X27 8X22 xx0x 0000

Power-on Reset, Brown-out Reset

(5)

RESET Instruction,

Resets,

WDT Reset,

Stack Resets

uu0u 0000

Wake-up via WDT

or Interrupt

(5)

uuuu uuuu

(5)

 2004 Microchip Technology Inc. Preliminary DS39646B-page 61

PIC18F8722 FAMILY

NOTES:

DS39646B-page 62 Preliminary  2004 Microchip Technology Inc.

PIC18F8722 FAMILY

5.0 MEMORY ORGANIZATION

There are three types of memory in PIC18 Enhanced microcontroller devices:

• Program Memory

• Data RAM

• Data EEPROM As Harvard architecture dev ices, the dat a and progra m

memories use separate busses; this allows for concurrent access of the two memory spaces. The data EEPROM, for practical purposes, can be regarded as a peripheral device, since it is addresse d and accessed through a set of control registers.

Additional detailed information on the operation of the Flash program memory is provided in Section 6.0 “Flash Program Memory”. Data EEPROM is discussed s eparately in Section 8.0 “Data EEPROM

Memory”.

5.1 Program Memory Organization

PIC18 microcontrollers implement a 21-bit program counter, which is capable of addressing a 2-Mbyte program memory space. Accessing a location between the upper boundary of the physically implemented memory and the 2-Mbyte address will return all ‘0’s (a NOP instruction).

The PIC18F6527 and PIC18F8527 each have 48 Kbytes of Flash memory an d can sto re up to 24, 576 sing le-wor d instructions.

The PIC18F6622 and PIC18F8622 each have 64 Kbytes of Flash memory an d can sto re up to 32, 768 sing le-wor d instructions.

The PIC18F6627 a nd PIC18F86 27 each have 9 6 Kbytes of Flash memory an d can sto re up to 49, 152 sing le-wor d instructions.

The PIC18F6722 and PIC18F8722 each have 128 Kbytes of Flash memory and can store up to 65,536 single-word instructions.

PIC18 devices have two interrupt vectors. The Reset vector address is at 0000h and the interrupt vector addresses are at 0008h and 0018h.

The program memory map for the PIC18F8722 family of devices is shown in Figure 5-1.

5.1.1 PIC18F8527/8622/8627/8722 PROGRAM MEMORY MODES

PIC18F8527/8622/8627/8722 devices differ significantly from their PIC18 pred ecesso rs in their util izatio n of program memory. In addition to available on-chip Flash program memory, these controllers can also address up to 2 Mbytes of external program memory through the external memory interface. There are four distinct operating modes available to the controllers:

• Microprocessor (M P)

• Microprocessor with Boot Block (MPBB)

• Extended Microcontroller (EMC)

• Microcontroller (MC)

The program memory mode is determined by setting the two Least Significant bits of the Configuration Register 3L (CONFIG3L) as shown in Register 25-4 (see Section 25.1 “Configuration Bits” for additional details on the device configuration bits).

The program memory modes operate as follows:

•The Microprocesso r Mod e permits access only

to external program memory; the contents of the on-chip Flash memory are ignored. The 21-bit program counter permits access to a 2-Mbyte linear program memory space.

• The Microprocessor with Boot Block Mode

accesses on-chip Flash memory from the Boot Block. Above this, external program memory is accessed all the way up to the 2-Mbyte limit. Program execution automatically switches between the two memories as required. The Boot Block is configurable to 1, 2 or 4 Kbytes.

• The Microcontroller Mode accesses only

on-chip Flash memory. Attempts to read above the physical limit of the on-chip Flash (0BFFFh for the PIC18F8527, 0FFFFh for the PIC18F8622, 17FFFh for the PIC18F8627, 1FFFFh for the PIC18F8722) causes a read of all ‘0’s (a NOP instruction).

The Microcontroller mode is also the only operating mode available to PIC18F6527/6622/6627/6722 devices.

•The Extended Microcontroller Mode allows

access to both internal and external program memories as a single block. The device can access its entire on-chip Flash memory; above this, the device accesses external program memory up to the 2-Mbyte program space limit. As with Boot Block mode, ex ecution a utomatica lly switches between the two memories as required.

In all modes, the microcontroller has complete access to data RAM and EEPROM.

Figure 5-2 compares t he me mo ry m aps of the different program memory modes. The differences between on-chip and external memory access limitations are more fully explained in Table 5-1.

 2004 Microchip Technology Inc. Preliminary DS39646B-page 63

PIC18F8722 FAMILY

FIGURE 5-1: PROGRAM MEMORY MAP AND STACK FOR PIC18F8722 FAMILY DEVICES

CALL,RCALL,RETURN RETFIE,RETLW

On-Chip

Program Memory

PIC18FX527

0BFFFh

0C000h

PC<20:0>

Stack Level 1

•

Stack Level 31

Reset Vector

High Priority Interrupt Vector

Low Priority Interrupt Vector

On-Chip

Program Memory

PIC18FX622

0FFFFh

10000h

On-Chip

Program Memory

PIC18FX627

017FFFh

018000h

On-Chip

Program Memory

PIC18FX722

0000h 0008h

0018h

User Memory Space

Read ‘0’

01FFFFh 1FFFFFh

T ABLE 5-1: MEMORY ACCESS FOR PIC18F8527/8622/8627/8722 PROGRAM MEMORY MODES

Internal Program Memory External Program Memory

Operating Mode

Microprocessor No Access No Access No Access Yes Yes Yes Microprocessor

w/ Boot Block Microcontroller Yes Yes Yes No Access No Access No Access Extended

Microcontroller

Execution

From

Yes Yes Yes Yes Yes Yes

Table Read

From

Table Write To

Execution

From

Table Read

From

Table Write To

DS39646B-page 64 Preliminary  2004 Microchip Technology Inc.

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FIGURE 5-2: MEMORY MAPS FOR PIC18F8722 FAMILY PROGRAM MEMORY MODES

Microprocessor

Mode

Microprocessor with Boot Block

Mode

Microcontroller

Mode

(5)

Extended

Microcontroller

Mode

000000h

External

Program

Memory

On-Chip Program Memory

(No

access)

000000h

0007FFh 000FFFh 001FFFh 000800h 001000h 002000h

On-Chip

(6)

Program Memory

External Program

Memory

Program Space Execution

1FFFFFh

External Memory Flash

On-Chip

1FFFFFh

External Memory

On-Chip

Flash

Note 1: PIC18F6527 and PIC18F8527.

2: PIC18F6622 and PIC18F8622. 3: PIC18F6627 and PIC18F8627. 4: PIC18F6722 and PIC18F8722. 5: This is the only mode availa ble on PIC18F6527/6622/6627/6722 devices. 6: Boot Block size is determined by the BBSIZ<1:0> bits in CONFIG4L.

000000h

0BFFFh 0FFFFh 017FFFh 01FFFFh 0C000h 010000h 018000h 020000h

1FFFFFh

000000h

On-Chip

Program

(1)

(2)

(3)

(4)

(1)

(2) (3) (4)

Memory

Reads

‘0’s

0BFFFh 0FFFFh 017FFFh 01FFFFh 0C000h 010000h 018000h 020000h

(1)

(2)

(3)

(4)

(1)

(2) (3) (4)

External

Program

On-Chip Program Memory

Memory

1FFFFFh

On-Chip

Flash

External Memory Flash

On-Chip

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5.1.2 PROGRAM COUNTER

The Program Counter (PC) specifies the address of the instruction to fetch for execu tion. The PC is 21 bits wide and is contained in three separate 8-bit registers. The low byte, known as the PCL register, is both readable and writable. The high byt e, or PCH re gister, contains the PC<15:8> bits; i t is not directly re adable or writ able. Updates to the PCH register are perfo rmed through the PCLATH register. The upper byte is called PCU. This register contains the PC<20:16> bits; it is also not directly readable or writable. Updates to the PCU register are performed through the PCLATU register.

The contents of PCLATH and PCLATU are transferred to the program counter by any operation that writes PCL. Similarly, the upper two bytes of the program counter are transferred to P CLATH and PCLATU by an operation that reads PCL. This is useful for computed offsets to the PC (see Section 5.1.5.1 “Computed GOTO”).

The PC addresses bytes in the program memory. To prevent the PC from becoming misaligned with word instructions, the Least Significant bit of PCL is fixed to a value of ‘0’. The PC increments by 2 to address sequential instructions in the program memory.

The CALL, RCALL, GOTO and program branch instructions write to the program counter directly. For these instructions, the contents of PCLATH and PCLATU are not transferred to the program counter.

5.1.3 RETURN ADDRESS STACK

The return address s tack allows any combinatio n of up to 31 program calls and interrupts to occur. The PC is pushed onto th e stac k when a CALL or RCALL instruction is executed or an interrupt is acknowledged. The PC value is pulled off the stack on a RETURN, RETLW or a RETFIE instruction. PCLATU and PCLA TH are n ot affected by any of the RETURN or CALL instructions.

The stack operates as a 31-word by 21-bit RAM and a 5-bit Stack Pointer, STKPTR. The stack space is not part of either program or da ta sp ace. The Stack Pointer is readable and writable and the address on the top of the stack is readable and writable through the top-ofstack Special File Registers. Data can also be pushed to, or popped from the stack, using these registers.

A CALL type instru ctio n caus es a pus h ont o the stac k; the Stack Pointer is first incremented and the location pointed to by the Stack Pointer is written with the contents of the PC (already pointing to the instruction following the CALL). A RETURN ty pe ins truc ti on c au se s a POP from the stack; the contents of the location pointed to by the STKPTR are transferred to the PC and then the Stack Pointer is decremented.

The Stack Pointer is initialized to ‘00000’ after all Resets. There is no RAM associated with the location corresponding to a Stack Pointer value of ‘00000’; this is only a Reset value. Status bits in dic ate if th e s t ac k i s full or has overflowed or has underflowed.

5.1.3.1 Top-of-Stack Access

Only the top of the return address stack (TOS) is readable and writable. A set of three registers, TOSU:TOSH:TOSL, hold th e contents of the stack location pointed to by the STKPTR register (Figure 5-3). This allows users to implement a software stack if necessary. After a CALL, RCALL or interrupt, the software can read the pushed value by reading the TOSU:TOSH:TOSL registers. These values can be placed on a use r defined software stack. At return time, the software can return these values to TOSU:TOSH:TOSL and do a return.

The user must disable the global interrupt enable bits while accessing the stack to prevent inadvertent stack corruption.

FIGURE 5-3: RETURN ADDRESS STACK AND ASSOCIATED REGISTERS

Return Address Stack <20:0>

11111

T op -of-Stack Registers Stack Pointer

TOSLTOSHTOSU

34h1Ah00h

Top-of-Stack

DS39646B-page 66 Preliminary  2004 Microchip Technology Inc.

001A34h 000D58h

11110 11101

STKPTR<4:0>

00010

00011 00010 00001 00000

PIC18F8722 FAMILY

5.1.3.2 Return Stack Pointer (STKPTR)

The STKPTR register (Reg ister 5-1) contains the Stack Pointer value, the STKFUL (Stack Full) status bit and the STKUNF (Stack Underflow) status bits. The value of the Stack Pointer can be 0 through 31. The Stack Pointer increments before values are pushed onto the stack and decrements after values are popped off the stack. On Reset, the stack pointer value will be zero. The user may read and write the stack pointer value. This feature can be used by a Real-Time Operating System (RTOS) for return stack maintenance.

After the PC is pus hed o nto the st ack 31 times (wi thout popping any values off the stack), the STKFUL bit is set. The STKFUL bit is cleared by software or by a POR.

The action that takes place when the stack becomes full depends on the state of the STVREN (Stack Overflow Reset Enable) configuration bit. (Refer to Section 25.1 “Configuration Bits” for a de scription of the device configuration bits.) If STVREN is set (default) , the 31st PUSH will push the (PC + 2) value onto the stack, set the STKFUL bit and reset the device. The STKFUL bit will remain set and the Stack Pointer will be set to zero.

If STVREN is cleared, the STKFUL bi t will be set on the 31st PUSH and the Stack Pointer will increment to 31. Any additional pushes will not overwrite the 31st PUSH and STKPTR will remain at 31.

When the stack has been popped enough times to unload the stack, the next POP will return a value of zero to the PC and set the STKUNF bit, wh ile the S t ack Pointer remains at zero. The STKUNF bit will remain set until cleared by software or until a POR occurs.

Note: Returning a value of zero to the PC on an

underflow has the effect of vectoring the program to the Reset vector, where the stack conditions can be verified and appropriate actions can be taken. This is not the same as a Reset, as the contents of the SFRs are not affected.

5.1.3.3 PUSH and POP Instruction s

Since the Top-of-Stack is readable and writable, the ability to push value s on to the st ac k an d pul l va lues off the stack without disturbing normal program execution is a desirable feature. The PIC18 instruction set includes two instructions, PUSH and POP, that permit the TOS to be manipulated under software control. TOSU, TOSH and T OS L can be m odifie d to plac e dat a or a return address on the stack.

The PUSH instruction places the current PC value onto the stack. This increments the Stack Pointer and loads the current PC value onto the stack.

The POP instruction discards the current TOS by decrementing the Stack Pointer. The previous value pushed onto the stack then becomes the TOS value.

REGISTER 5-1: STKPTR: STACK POINTER REGISTER

R/C-0 R/C-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

STKFUL

bit 7 bit 0

bit 7 STKFUL: Stack Full Flag bit

1 = Stack became full or overflowed 0 = Stack has not become full or overflowed

bit 6 STKUNF: Stack Underflow Flag bit

1 = Stack underflow occurred 0 = Stack underflow did not occur

bit 5 Unimplemented: Read as ‘0’ bit 4-0 SP4:SP0: Stack Pointer Location bits

Legend:

R = Readable bit W = Writable bit U = Unimplemented C = Clearable only bit

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

(1)

STKUNF

Note 1: Bit 7 and bit 6 are cleared by user software or by a POR.

(1)

— SP4 SP3 SP2 SP1 SP0

(1)

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5.1.3.4 Stack Full and Underflow Resets

Device Resets on stack overflow and stack underflow conditions are enabled by setting the STVREN bit in Configuration Regist er 4L. When STVREN is set, a full or underflow will set the appropriate STKFUL or STKUNF bit and then cause a device Reset. When STVREN is cleared, a full or underflow condi tion will set the appropriate STKFUL or STKUNF bit, but not caus e a device Reset. The STKFUL or STKUNF bits are cleared by the user software or a Power-on Reset.

5.1.4 FAST REGISTER STACK

A fast register stack is provided for the Status, WREG and BSR registers, to provide a “fast return” option for interrupts. The stack for each register is only one level deep and is neither readable nor writable. It is loaded with the current value of the corresponding register when the processor vectors for an interrupt. All interrupt sources will push values into the stack registers. The values in the registers are then loaded back into their associated registers if the RETFIE, FAST instruction is used to return from the interrupt.

If both low and high priority interrupts are enabled, the stack registers cannot be used reliably to return from low priority interrupts. If a high priority interrupt occurs while servicing a low priori ty interrupt, the stack register values stored by the low priority interrupt will be overwritten. In these cases, users must save the key registers in software during a low priority interrupt.

If interrupt priority is not used, all interrupts ma y use the fast register stack for returns from interrupt. If no interrupts are used, the fast register stack can be used to restore the STATUS, WREG and BSR registers at the end of a subroutine call. To use the fast register stack for a subroutine call, a CALL label, FAST instruction must be executed to save the STATUS, WREG and BSR registers to the fast register stack. A RETURN, FAST instruction is then executed to restore these registers from the fast register stack.

Example 5-1 shows a source code example that uses the fast register stack during a subroutine call and return.

EXAMPLE 5-1: FAST REGIST ER STACK

CODE EXAMPLE

CALL SUB1, FAST ;STATUS, WREG, BSR

;SAVED IN FAST REGISTER ;STACK

•

SUB1 •

•

RETURN, FAST ;RESTORE VALUES SAVED

;IN FAST REGISTER STACK

5.1.5 LOOK-UP TABLES IN PROGRAM MEMORY

There may be programming situations that require the creation of data structures, or look-up tables, in program memory. For PIC18 devices, look-up tables can be implemented in two ways:

• Computed GOTO

• Table Reads

5.1.5.1 Computed GOTO

A computed GOTO is accomplished by adding an offset to the program counter. An example is shown in Example 5-2.

A look-up table can be formed with an ADDWF PCL instruction and a group of RETLW nn instructions. The W register is load ed with an of fset in to the t able bef ore executing a call to that table. The first instruction of the called routine is the ADDWF PCL instruction. The next instruction executed wil l be on e of t he RETLW nn instructions that returns the valu e ‘nn’ t o t he c al li ng fu nc ti on .

The offset value (in WREG) specifies the number of bytes that the program counter should advance and should be multiples of 2 (LSb = 0).

In this method, only one data byte may be stored in each instruction location and room on the return address stack is required.

Note: The “ADDWF PCL” instruction does not

update the PCLATH and PCLATU registers. A read operation on PCL must be performed to update PCLATH and PCLA TU.

EXAMPLE 5-2: COMPUTED GOTO USING AN OFFSET VALUE

MAIN: ORG 0x0000

…

TABLE MOVF PCL, F ; A simple read of PCL will update PCLATH, PCLATU

DS39646B-page 68 Preliminary  2004 Microchip Technology Inc.

MOVLW 0x00 CALL TABLE

ORG 0x8000

RLNCF W, W ; Multiply by 2 to get correct offset in table ADDWF PCL ; Add the modified offset to force jump into table RETLW ‘A’ RETLW ‘B’ RETLW ‘C’ RETLW ‘D’ RETLW ‘E’ END

PIC18F8722 FAMILY

5.1.5.2 Table Reads and Table Writes

A better method of storing data in program memory allows two bytes of dat a to be stored in each instruction location.

Look-up table data may be stored two bytes per program word by using table reads and writes. The Table Pointer (TBLPTR) register specifies the byte address and the Table Latch (TABLAT) register contains the data that is read from or wr itten to progr am memory. Data is transferred to or from program memory one byte at a time.

Table read and table write operations are discussed further in Section 6.1 “Table Reads and Table

Writes”.

5.2 PIC18 Instruction Cycle

5.2.1 CLOCKING SCHEME

The microcontroller clock input, whether from an internal or external source, is internally divided by four to generate four non-overlapping quadrature clocks (Q1, Q2, Q3 and Q4). Internally, the program counter is incremented

FIGURE 5-4: CLOCK/INSTRUCTION CYCLE

on every Q1; the instruction is fetched from the program memory and latched into the instruction register during Q4. The instruction is decoded and executed during the following Q1 through Q4. The clocks and instruction

execution flow are shown in Figure 5-4.

5.2.2 INSTRUCTION FLOW/PIPELINING

An “Instruction Cycle” consists of four Q cycles: Q1 through Q4. The instruction fetch and execute are pipelined in such a manner that a fetch takes one instruction cycle, while the decode and execute take another instruction cycle. However, due to the pipelining, each instruction effectively executes in one cycle. If a n instruc tion caus es the pro gram coun ter to change (e.g., GOTO), then two cycles are required to complete the instruction (Example 5-3).

A fetch cycle begins with the program counter incrementing in Q1.

In the execution cy cle, the fetch ed instruction i s latched into the Instruction Register (IR) in cycle Q1. This instruction is then decoded and executed during the Q2, Q3 and Q4 cycle s. D ata memory is re ad dur ing Q 2

OSC1

Q1 Q2 Q3 Q4 PC

OSC2/CLKO

(RC mode)

Q2 Q3 Q4

PC PC + 2 PC + 4

Execute INST (PC – 2)

Fetch INST (PC)

Q2 Q3 Q4

Execute INST (PC)

Fetch INST (PC + 2)

EXAMPLE 5-3: INSTRUCTION PIPELINE FLOW

TCY0TCY1TCY2TCY3TCY4TCY5

1. MOVLW 55h

2. MOVWF PORTB

3. BRA SUB_1

4. BSF PORTA, BIT3 (Forced NOP)

5. Instruction @ address SUB_1

Fetch 1 Execute 1

Fetch 2 Execute 2

Fetch 3 Execute 3

Fetch 4 Flush (NOP)

Q2 Q3 Q4

Internal Phase Clock

Execute INST (PC + 2)

Fetch INST (PC + 4)

Fetch SUB_1 Execute SUB_1

All instructions are single cycle, except for any program branche s. These take tw o cycles since the fetch instruction is “flushed” from the pipeline while the new instruction is being fetched and then executed.

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5.2.3 INSTRUCTIONS IN PROGRAM MEMORY

The program memory is addressed in bytes. Instructions are stored as two bytes or four bytes in program memory. The Least Significant Byte of an instruction word is always stored in a program memory location with an even address (LSb = 0). To maintain alignment with instruction bo undaries , the PC incr ements in step s of 2 and the LSb wi ll always read ‘0’ (see Section 5.1.2 “Program Counter”).

Figure 5-5 shows an exam ple of h ow in st ruc tion w ord s are stored in the program memory.

The CALL and GOTO instructions have the absolute program memory address embedded into the instruction. Since instructions are always stored on word boundaries, the data contained in the instruction is a word address. The word address is written to PC<20:1>, which accesses the desired byte address in program memory. Instruction #2 in Figure 5-5 shows how the instruction GOTO 0006h is encoded in the program memory. Program branch instructions, which encode a relative address offset, operate in the same ma nner. The offset value stored in a br anch instruction represent s the number of single-word instructions that the PC will be offset by. Section 26.0 “Instruction Set Summary” provides further details of the instruction set.

FIGURE 5-5: INS TRUCTIONS IN PROGRAM MEMORY

Program Memory Byte Locations

Instruction 1: MOVLW 055h 0Fh 55h 000008h Instruction 2: GOTO 0006h EFh 03h 00000Ah

Instruction 3: MOVFF 123h, 456h C1h 23h 00000Eh

→

LSB = 1 LSB = 0 ↓

F0h 00h 00000Ch

F4h 56h 000010h

Word Address

000000h 000002h 000004h 000006h

000012h 000014h

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5.2.4 TWO-WORD INSTRUCTIONS

The standard PIC18 instruction set has 8 two-word instructions: CALL, MOVFF, GOTO, LSFR, ADDULNK, CALLW, MOVSS and SUBULNK. In all cases, the second word of th e instructi ons always ha s ‘1111’ as its four Most Signi fican t bit s; the oth er 12 bit s are litera l data, usually a data memory address.

The use of ‘1111’ in the 4 MSbs of an instruction specifies a special form of NOP. If the instructio n is exec uted in proper sequence – immediately after the first word – the data in the s econd word is ac cessed an d used by

the instruction seq ue nce . If th e fi rst word is skipped for some reason and the se cond word is ex ecuted by itsel f, a NOP is executed instead. This is necessary for cases when the two-word instruction is preceded by a conditional instruction that changes the PC. Example 5-4 shows how this works.

Note: See Section 5.6 “PIC18 Instruction

Execution and the Extended Instruction Set” for information on two-word

instructions in the extended instruction set.

EXAMPLE 5-4: TWO-WORD INSTRUCTIONS

CASE 1: Object Code Source Code

0110 0110 0000 0000 TSTFSZ REG1 ; is RAM location 0? 1100 0001 0010 0011 MOVFF REG1, REG2 ; No, skip this word 1111 0100 0101 0110 ; Execute this word as a NOP 0010 0100 0000 0000 ADDWF REG3 ; continue code

CASE 2: Object Code Source Code

0110 0110 0000 0000 TSTFSZ REG1 ; is RAM location 0? 1100 0001 0010 0011 MOVFF REG1, REG2 ; Yes, execute this word 1111 0100 0101 0110 ; 2nd word of instruction 0010 0100 0000 0000 ADDWF REG3 ; continue code

 2004 Microchip Technology Inc. Preliminary DS39646B-page 71

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5.3 Data Memory Organization

Note: The operation of some aspects of data

memory are changed when the PIC18 extended instruction set is enabled. See

Section 5.5 “Data Memory and the Extended Instruction Set” for more

information.

The data memory in PIC18 devices is implemented as static RAM. Each register in the data memory has a 12-bit address, allowing up to 4096 bytes of data memory . The m emory sp ace is div ided into as many as 16 banks that contai n 256 bytes ea ch; the PIC18F8722 family of devices implements all 16banks. Figure 5-6 shows the data memory organization for the PIC18F8722 family of devices.

The data memory contains Special Function Registers (SFRs) and General Purpose Registers (GPRs). The SFRs are used for control and status of the controller and peripheral functio ns, while GPRs are us ed for data storage and scratchpad operations in the user’s application. Any re ad of an unimpl emented location will read as ‘0’s.

The instruction set and architecture allow operations across all banks. The entire data memory may be accessed by Direct, Indirect or Indexed Addressing modes. Addressing modes are discussed later in this subsection.

To ensure that commonly used registers (SFRs and select GPRs) c an b e ac cess ed i n a si ngle cyc le, PI C18 devices impl em ent an Ac ce ss Ba nk . Th is i s a 256-byte memory space that pr ovid es fa st acces s to SFRs a nd the lower portion of GPR Bank 0 without using the BSR. Section 5.3.2 “Access Bank” provides a detailed description of the Access RAM.

5.3.1 BANK SELECT REGISTER (BSR)

Large areas of data memory require an efficient addressing scheme to make rapid access to any address possible. Ideally, this means that an entire address does not need to be provided for each read or write operation. For PIC18 devices, this is accomplished with a RAM banking scheme. This divides the memory space into 16 contiguous banks of 256 bytes. Depending on the instruction, each location can be addressed directly by its full 12-bit address, or an 8-bit low-order address and a 4-bit bank pointer.

Most instruct ions in th e PIC18 in struct ion set ma ke use of the bank poin ter, known as the Bank Select Reg ister (BSR). This SFR holds the 4 Most Significant bits of a location’s address; the instruction itself includes the 8 Least Significant bits. Only the four lower bits of the BSR are implemented (BSR3:BSR0). The upper four bits are unused; the y will always read ‘ 0’ and cannot be written to. The BSR can be l oaded direc tly by using the MOVLB instruction.

The value of the BSR indicates the bank in data memory; the 8 bits in the instruction show the location in the bank and can be thought of as an of fs et from th e bank’s lower boundary. The relationship between the BSR’s value and the bank division in data memory is shown in Figure 5-7.

Since up to 16 regis ters m ay share the s ame l ow-order address, the user must alway s be careful to ensure that the proper bank is selected before performing a data read or write. For example, writing what should be program data to an 8 -bi t ad dres s of F 9h w h il e th e BSR is 0Fh will end up resetting the program counter.

While any bank can be s el ec ted, only those banks that are actually implemented can be read or written to. Writes to unimplemented banks are ignored, while reads from unimplemented banks will return ‘0’s. Even so, the STATUS register will still be affected as if the operation was successful. The data memory map in Figure 5-6 indicates which banks are implemented.

In the core PIC18 instruction set, only the MOVFF instruction fully specifies the 12-bit address of the source and target registers. This i nstruction ig nores the BSR completely when it ex ecutes. All o ther instructi ons include only the low-order address as an operand and must use either the BSR or the Access Bank to locate their target registers.

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FIGURE 5-6: DATA MEMORY MAP FOR THE PIC18F8722 FAMILY OF DEVICES

BSR<3:0>

= 0000

= 0001

= 0010

= 0011

= 0100

= 0101

= 0110

= 0111

= 1000

= 1001

= 1010

= 1011

= 1100

= 1101

= 1110

= 1111

Bank 0

Bank 1

Bank 2

Bank 3

Bank 4

Bank 5

Bank 6

Bank 7

Bank 8

Bank 9

Bank 10

Bank 11

Bank 12

Bank 13

Bank 14

Bank 15

Data Memory Map

00h

FFh 00h

FFh

Access RAM

GPR

SFR

000h 05Fh 060h 0FFh 100h

1FFh 200h

2FFh 300h

3FFh 400h

4FFh 500h

5FFh 600h

6FFh 700h

7FFh 800h

8FFh 900h

9FFh A00h

AFFh B00h

BFFh C00h

CFFh D00h

DFFh E00h

EFFh F00h F5Fh

F60h FFFh

When ‘a’ = 0:

The BSR is ignored an d the Access Bank is used.

The first 96 bytes are general purpose RAM (from Bank 0).

The second 160 bytes are Special Function Registers (from Bank 15).

When ‘a’ = 1:

The BSR specifies the Ban k used by the instruction.

Access Bank

Access RAM Low

Access RAM High

(SFRs)

00h

5Fh

60h

FFh

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FIGURE 5-7: USE OF THE BANK SELECT REGISTER (DIRECT ADDRESSING)

Memory

BSR

0000

Bank Select

(2)

(1)

0011

000h

100h

200h

300h

Data

Bank 0 Bank 1

Bank 2

Bank 3

through

Bank 13

00h FFh

00h

From Opcode

11111111

(2)

E00h

F00h

FFFh

Note 1: The Access RAM bit of the instruction can be used to force an override of the selected bank (BSR<3:0>) to

the registers of the Access Bank.

2: The MOVFF instruction embeds the entire 12-bit address in the instruction.

Bank 14

Bank 15

5.3.2 ACCESS BANK

While the use of the BSR with an embedded 8-bit address allows users to address the entire range of data memory, it also means th at the user must a lways ensure that the correct bank is selected. Otherwise, data may be read from or written to the wrong location. This can be disastrous if a GPR is the intended target of an operation, but an SFR is written to instead. Verifying and/or changing the BSR for each read or write to data memory can become very inefficient.

T o stre amline acces s for the most commonl y used data memory locations, the data memory is configured with an Access Bank, which allows users to access a mapped block of memory without specifying a BSR. The Access Bank consists of the first 96 bytes of memory (00h-5Fh) in Bank 0 and the last 160 bytes of memory (60h-FFh) in Block 15 . The lower half is known as the “Access RAM” and is composed of GPRs. This

FFh 00h

FFh

however, the instruction is forced to use the Access Bank address map; the current value of the BSR is ignored entirely.

Using this “forced” addressing allows the instruction to operate on a data address in a single cycle, without updating the BSR first. For 8-bit addresses of 60h and above, this mean s that use rs can ev aluate an d operate on SFRs more efficiently. The Access RAM below 60h is a good place for da ta values that the user might need to access rapidly, such as immediate computational results or common program variables. Access RAM also allows for faster and more code efficient context saving and switching of variables.

The mapping of the Access Bank is slightly different when the extended instruction set is enabled (XINST configuration bit = 1). This is discussed in more detail in Section 5.5.3 “Mapping the Access Bank in Indexed Literal Offset Mode”.

upper half is also where the device’s SFRs are mapped. These two areas are mapped contiguously in the Access Bank and can be addressed in a linear fashion by an 8-bit address (Figure 5-6).

The Access Bank is used by core PIC18 instructions that inclu de the Acce ss RAM bit ( the ‘a’ parame ter in the instruction). When ‘a’ is equal to ‘1’, t he in st ru ct ion uses the BSR and the 8-bit address included in the opcode for the data memory address. When ‘a’ is ‘0’,

5.3.3 GENER AL PURPOSE REGISTER FILE

PIC18 devices may have banked memory in the GPR area. This is data RAM, which is available for use by all instructions. GPRs start at the bottom of Bank 0 (address 000h) and grow upwards towards the bottom of the SFR area. GPRs are not initialized by a Power-on Reset and are unchanged on all other Resets.

DS39646B-page 74 Preliminary  2004 Microchip Technology Inc.

PIC18F8722 FAMILY

5.3.4 SPECIAL FUNCTION REGISTERS

The Special Function Registers (SFRs) are registers used by the CPU and p eripheral modul es for controllin g the desired operation of the device. These reg isters are implemented as static RAM. SFRs start at the top of data memory (FF Fh) and extend downw ard to oc cupy the top half of Bank 15 (F60h to FFFh). A list of these registers is given in Table 5-2 and Table 5-3.

The SFRs can be classified into two sets: those associated with the “core” device functionality (ALU, Resets and interrupts) and those related to the peripheral functions. The Reset and interrupt registers are described in their respective chapters, while the ALU’s STATUS register is described later in this section. Registers related to the operation of a peripheral feature are described in the cha pter for that pe riphera l.

The SFRs are typically distributed among the peripherals whose fun cti ons th ey c ontr ol. U nus ed SFR locations are unimplemented and read as ‘0’s.

TABLE 5-2: SPECIAL FUNCTION REGISTER MAP FOR THE PIC18F8722 FAMILY OF D EVICES

Address Name Address Name Address Name Address Name Address Name

FFFh TOSU FDFh INDF2

FFEh TOSH FDEh POSTINC2 FFDh TOSL FDDh POSTDEC2 FFCh STKPTR FDCh PREINC2

FFBh PCLATU FDBh PLUSW2

FFAh PCLATH FDAh FSR2H FBAh CCP2CON F9Ah TRISJ

FF9h PCL FD9h F SR2L FB9h CCPR3H F99h TRISH

FF8h TBLPTRU FD8h STATUS FB8h CCPR3L F98h TRISG F78h TMR4

FF7h TBLPTRH FD7h TMR0H FB7h CCP3CON F97h TRISF F77h PR4

FF6h TBLPTRL FD6h TMR0L FB6h ECCP1AS F96h TRISE F76h T4CON

FF5h TABLAT FD5h T0CON F B5h CVRCON F95h T R I SD F75h CCPR4H

FF4h PRODH FD4h

FF3h PRODL FD3h OSCCON FB3h TMR3H F93h TRISB F73h CCP 4CON

FF2h INTCON FD2h HLVDCON FB2h TMR3L F92h TRISA F72h CCPR5H

FF1h INTCON2 FD1h WDTCON FB1h T3CON F91h LATJ

FF0h INTCON3 FD0h RCON F B 0h PSPCON F90h LATH

(1)

FEFh INDF0 FEEh POSTINC0 FEDh POSTDEC0 FECh PREINC0 FEBh PLUSW0

FCFh TMR1H FAFh SPBRG1 F8Fh LATG F6Fh SPBRG2

(1)

FCEh TMR1L FAEh RCREG1 F8Eh LATF F6Eh RCREG2

(1)

FCDh T1CON FADh TXREG1 F8Dh LATE F6Dh TXREG2

(1)

FCCh TMR2 FACh TXSTA1 F8Ch LATD F6Ch TXSTA2

FCBh PR2 FABh RCSTA1 F8Bh LATC F6Bh RCSTA2

FEAh FSR0H FCAh T2CON FAAh EEADRH F8Ah LATB F6Ah ECCP3AS

FE9h FSR0L FC9h SSP1BUF FA9h EEADR F89h LATA F69h ECCP3DEL

FE8h WREG FC8h SSP1ADD FA8h EEDATA F88h PORTJ

FE7h INDF1

FE6h PO STINC1

FE5h POSTDEC 1

FE4h PREINC1

FE3h PLUSW1

(1)

FC7h SSP1STAT FA7h EECON2

(1)

FC6h SSP1CON1 FA6h EECON1 F86h PORTG F66h SSP2BUF

(1)

FC5h SSP1CON2 FA5h IPR3 F85h PORTF F65h SSP2ADD FC4h ADRESH FA4h PIR3 F84h PORTE F64h SSP2STAT

FC3h ADRESL FA3h PIE3 F83h PORTD F63h SSP2CON1 FE2h FSR1H FC2h ADCON0 FA2h IPR2 F82h PORTC F62h SSP2CON2 FE1h FSR1L FC1h ADCON1 FA1h PIR2 F81h PORTB F61h FE0h BSR FC0h ADCON2 FA0h PIE2 F80h PORTA F60h —

Note 1: This is not a physical register.

2: Unimplemented registers are read as ‘0’. 3: This register is not available on 64-pin devices.

(1)

FBFh CCPR1H F9Fh IPR1 F7Fh SPBRGH1

(1)

FBEh CCPR1L F9Eh PIR1 F7Eh BAUDCON1

(1)

FBDh CCP1CON F9Dh PIE1 F7Dh SPBRGH2

(1)

(2)

—

FBCh CCPR2H F9Ch MEMCON F7Ch BAUDCON2 FBBh CCPR2L F9Bh OSCTUNE F7Bh —

(3) (3)

F7Ah —

F79h ECCP1DEL

FB4h CMCON F94h TRISC F74h CCPR4L

(3)

(1)

F87h PORTH

(3)

F71h CCPR5L F70h CCP5CON

F68h ECCP2AS F67h ECCP2DEL

—

(2) (2)

 2004 Microchip Technology Inc. Preliminary DS39646B-page 75

PIC18F8722 FAMILY

TABLE 5-3: REGISTER FILE SUMMARY

File Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

TOSU TOSH Top-of-Stack High Byte (TOS<15:8>) 0000 0000 57, 66 TOSL Top-of-Stack Low Byte (TOS<7:0>) 0000 0000 57, 66 STKPTR STKFUL PCLATU PCLATH Hol d ing R egist er for PC< 15: 8> 0000 0000 57, 66 PCL PC Low Byte (PC<7:0>) 0000 0000 57, 66 TBLPTRU TBLPTRH Program Memory Table Pointer High Byte (TBLPTR<15:8>) 0000 0000 57, 90 TBLPTRL Program Memory Table Pointer Low Byte (TBLPTR<7:0>) 0000 0000 57, 90 TABLAT Program Memory Table Latch 0000 0000 57, 90 PRODH Product Register High Byte xxxx xxxx 57, 117 PRODL Product Register Low Byte xxxx xxxx 57, 117 INTCON GIE/GIEH PEIE/GIEL TMR0IE INT0IE RBIE TMR0IF INT0IF RBIF 0000 000x 57, 121 INTCON2 RBPU INTCON3 INT2IP INT1IP INT3IE INT2IE INT1IE INT3IF INT2IF INT1IF 1100 0000 57, 123 INDF0 Uses contents of FSR0 to address data memory – value of FSR0 not changed (not a physical register) N/A 57, 82 POSTINC0 Uses contents of FSR0 to address data memory – value of FSR0 post-incremented (not a physical register) N/A 57, 82 POSTDEC0 Uses contents of FSR0 to address data memory – value of FSR0 post-decremented (not a physical register) N/A 57, 82 PREINC0 Uses contents of FSR0 to address data memory – value of FSR0 pre-incremented (not a physical register) N/A 57, 82 PLUSW0 Uses contents of FSR0 to address data memory – value of FSR0 pre-incremented (not a physical register) –

FSR0H FSR0L Indirect Data Memory Address Pointer 0 Low Byte xxxx xxxx 57, 82 WREG Working Regi st er xxxx xxxx 57 INDF1 Uses contents of FSR1 to address data memory – value of FSR1 not changed (not a physical register) N/A 57, 82 POSTINC1 Uses contents of FSR1 to address data memory – value of FSR1 post-incremented (not a physical register) N/A 57, 82 POSTDEC1 Uses contents of FSR1 to address data memory – value of FSR1 post-decremented (not a physical register) N/A 57, 82 PREINC1 Uses contents of FSR1 to address data memory – value of FSR1 pre-incremented (not a physical register) N/A 57, 82 PLUSW1 Uses contents of FSR1 to address data memory – value of FSR1 pre-incremented (not a physical register) –

FSR1H FSR1L Indirect Data Memory Address Pointer 1 Low Byte xxxx xxxx 58, 82 BSR INDF2 Uses contents of FSR2 to address data memory – value of FSR2 not changed (not a physical register) N/A 58, 82 POSTINC2 Uses contents of FSR2 to address data memory – value of FSR2 post-incremented (not a physical register) N/A 58, 82 POSTDEC2 Uses contents of FSR2 to address data memory – value of FSR2 post-decremented (not a physical register) N/A 58, 82 PREINC2 Uses contents of FSR2 to address data memory – value of FSR2 pre-incremented (not a physical register) N/A 58, 82 PLUSW2 Uses contents of FSR2 to address data memory – value of FSR2 pre-incremented (not a physical register) –

FSR2H FSR2L Indirect Data Memory Address Pointer 2 Low Byte xxxx xxxx 58, 82

Legend: x = unknown , u = unchanged, - = unimplemented, q = value depends on condition Note 1: The SBOREN bit is only available when the BOREN1:BOREN0 configuration bits = 01; otherwise, this bit reads as ‘0’.

2: These re gisters and/or bits are not implemented on 64-pin devices and are read as

3: The PLLEN bit is only available in specific oscillator configuration; otherwise, it is disabled and reads as

4: RA6/RA7 and their associated latch and direction bits are individually configured as port pins based on various primary oscillator modes.

5: RG5 and LATG5 are only available when Master Clear is disabled (MCLRE configuration bit = 0); otherwise, RG5 and LATG5 read as 6: Bit 7 and Bit 6 are cleared by user software or by a POR. 7: Bit 21 of TBLPTRU allows access to the device configuration bits.

— — — Top-of-Stack Upper Byte (TOS<20:16>) ---0 0000 57, 66

(6)

— — — Holding Register for PC<20:16> ---0 0000 57, 66

— —bit 21

value of FSR0 offset by W

— — — — Indirect Data Memory Address Pointer 0 High ---- 0000 57, 82

value of FSR1 offset by W

— — — — Indirect Data Memory Address Pointer 1 High ---- 0000 58, 82

— — — — Bank Select Register ---- 0000 58, 72

value of FSR2 offset by W

— — — — Indirect Data Memory Address Pointer 2 High ---- 0000 58, 82

(6)

STKUNF

INTEDG0 INTEDG1 IN TEDG2 INTEDG3 TMR0IP INT3IP RBIP 1111 1111 57, 122

— SP4 SP3 SP2 SP1 SP0 00-0 0000 57, 67

(7)

Program Memory Table Pointer Upper Byte (TBLPTR<20:16>) --00 0000 57, 90

‘0’. Reset values are shown for 80-pin devices;

individual unimplemented bits should be interpreted as ‘-’.

‘0’. See Section2.6.4 “PLL in

INTOSC Modes”.

When disabled, these bits read as ‘0’.

Value on

POR, BOR

N/A 57, 82

N/A 58, 82

Details

on page:

‘0’.

DS39646B-page 76 Preliminary  2004 Microchip Technology Inc.

PIC18F8722 FAMILY

TABLE 5-3: REGISTER FILE SUMMARY (CONTINUED)

File Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

STATUS — — —NOVZDCC---x xxxx 58, 80 TMR0H Timer0 Register High Byte 0000 0000 58, 163 TMR0L Timer0 Register Low Byte xxxx xxxx 58, 163 T0CON TMR0ON T08BIT T0CS T0SE PSA T0PS2 T0PS1 T0PS0 1111 1111 58, 161 OSCCON IDLEN IRCF2 IRCF1 IRCF0 OSTS IOFS SCS1 S CS0 0100 q000 39, 58 HLVDCON VDIRMAG WDTCON RCON IPEN SBOREN

TMR1H Timer1 Register High Byte xxxx xxxx 58, 169 TMR1L Timer1 Register Low Byte xxxx xxxx 58, 169

T1CON RD16 T1RUN T1CKPS1 T1CKPS0 T1OSCEN T1SYNC TMR2 Timer2 Register 0000 0000 58, 172 PR2 Timer2 Period Register 1111 1111 58, 172 T2CON SSP1BUF MSSP1 Receive Buffer/Transmit Register xxxx xxxx 58, 169,

SSP1ADD MSSP1 Address Register in I SSP1STAT SMP CKE D/A

SSP1CON1 WCOL SSPOV SSPEN CKP SSPM3 SSPM2 SSPM1 SSPM0 0000 0000 58, 163,

SSP1CON2 GCEN ACKSTAT ACKDT ACKEN RCEN PEN RSEN SEN 0000 0000 58, 173 ADRESH A/D Result Register High Byte xxxx xxxx 59, 280 ADRESL A/D Result Register Low Byte xxxx xxxx 59, 280

ADCON0 ADCON1 ADCON2 ADFM CCPR1H Enhanced Capture/Compare/PWM Register 1 High Byte xxxx xxxx 59, 180 CCPR1L Enhanced Capture/Compare/PWM Register 1 Low Byte xxxx xxxx 59, 180 CCP1CON P1M1 P1M0 DC1B1 DC1B0 CCP1M3 CCP1M2 CCP1M1 CCP1M0 0000 0000 59, 187 CCPR2H Enhanced Capture/Compare/PWM Register 2 High Byte xxxx xxxx 59, 180 CCPR2L Enhanced Capture/Compare/PWM Register 2 Low Byte xxxx xxxx 59, 180 CCP2CON P2M1 P2M0 DC2B1 DC2B0 CCP2M3 CCP2M2 CCP2M1 CCP2M0 0000 0000 59, 179 CCPR3H Enhanced Capture/Compare/PWM Register 3 High Byte xxxx xxxx 59, 180 CCPR3L Enhanced Capture/Compare/PWM Register 3 Low Byte xxxx xxxx 59, 180 CCP3CON P3M1 P3M0 DC3B1 DC3B0 CCP3M3 CCP3M2 CCP3M1 CCP3M0 0000 0000 59, 179 ECCP1AS ECCP1ASE ECCP1AS2 ECCP1AS1 ECCP1AS0 PSS1AC1 PSS1AC0 PSS1BD1 PSS1BD0 0000 0000 59, 201 CVRCON CVREN CVROE CVRR CVRSS CVR3 CVR2 CVR1 CVR0 0000 0000 59, 287 CMCON C2OUT C1OUT C2INV C1INV CIS CM2 CM1 CM0 0000 0111 59, 281 TMR3H Timer3 Register High Byte xxxx xxxx 59, 175 TMR3L Timer3 Register Low Byte xxxx xxxx 59, 175 T3CON RD16 T3CCP2 T3CKPS1 T3CKPS0 T3CCP1 T3SYNC

2: These re gisters and/or bits are not implemented on 64-pin devices and are read as

3: The PLLEN bit is only available in specific oscillator configuration; otherwise, it is disabled and reads as

4: RA6/RA7 and their associated latch and direction bits are individually configured as port pins based on various primary oscillator modes.

— — — — — — —SWDTEN--- ---0 58, 313

— T2OUTPS3 T2OUTPS2 T2OUTPS1 T2OUTPS0 TMR2ON T2CKPS1 T2CKPS0 -000 0000 58, 171

— — CHS3 CHS2 CHS1 CHS0 GO/DONE ADON --00 0000 59, 271 — — VCFG1 VCFG0 PCFG3 PCFG2 PCFG1 PCFG0 --00 0000 59, 272

individual unimplemented bits should be interpreted as ‘-’.

INTOSC Modes”.

When disabled, these bits read as ‘0’.

— IRVST HLVDEN HLVDL3 HLVDL2 HLVDL1 HLVDL0 0-00 0101 58, 291

(1)

—RITO PD POR BOR 0q-1 11q0 50, 56,

TMR1CS TMR1ON 0000 0000 58, 165

C™ Slave mode. MSSP1 Baud Rate Reload Register in I2C Master mode. 0000 0000 58, 170

PSR/WUA BF 0000 0000 58, 162,

— ACQT2 ACQT1 ACQT0 ADCS2 ADCS1 ADCS0 0-00 0000 59, 273

TMR3CS TMR3ON 0000 0000 59, 173

‘0’. Reset values are shown for 80-pin devices;

‘0’. See Section2.6.4 “PLL in

Value on

POR, BOR

Details

on page:

58, 133

170

171

172

‘0’.

 2004 Microchip Technology Inc. Preliminary DS39646B-page 77

PIC18F8722 FAMILY

TABLE 5-3: REGISTER FILE SUMMARY (CONTINUED)

File Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

PSPCON IBF OBF IBOV PSPMODE — — — — 0000 ---- 59, 252 SPBRG1 EUSART1 Baud Rate Generator Register Low Byte 0000 0000 59, 252 RCREG1 EUSART1 Receive Register 0000 0000 59, 260 TXREG1 EUSART1 Transmit Register 0000 0000 59, 257 TXSTA1 CSRC TX9 TXEN SYNC SENDB BRGH TRMT TX9D 0000 0010 59, 248 RCSTA1 SPEN RX9 SREN CREN ADDEN FERR OERR RX9D 0000 000x 59, 249 EEADRH

EEADR EEPROM Address Register Low Byte 0000 0000 59, 111 EEDATA EEPROM Data Register 0000 0000 59, 111 EECON2 EEPROM Control Register 2 (not a physical register) 0000 0000 59, 88 EECON1 EEPGD CFGS IPR3 SSP2IP BCL2IP RC2IP TX2IP TMR4IP CCP5IP CCP4IP CCP3IP 1111 1111 60, 131 PIR3 SSP2IF BCL2IF RC2IF TX2IF TMR4IF CCP5IF CCP4IF CCP3IF 0000 0000 60, 125 PIE3 SSP2IE BCL2IE RC2IE TX2IE TMR4IE CCP5IE CCP4IE CCP3IE 0000 0000 60, 128 IPR2 OSCFIP CMIP PIR2 OSCFIF CMIF PIE2 OSCFIE CMIE IPR1 PSPIP ADIP RC1IP TX1IP SSP1IP CCP1IP TMR2IP TMR1IP 1111 1111 60, 130 PIR1 PSPIF ADIF RC1IF TX1IF SSP1IF CCP1IF TMR2IF TMR1IF 0000 0000 60, 124 PIE1 PSPIE ADIE RC1IE TX1IE SSP1IE CCP1IE TMR2IE TMR1IE 0000 0000 60, 127 MEMCON OSCTUNE INTSRC PLLEN TRISJ TRISH TRISG TRISF TRISF7 TRISF6 TRISF5 TRISF4 TRISF3 TRISF2 TRISF1 TRISF0 1111 1111 60, 150 TRISE TRISE7 TRISE6 TRISE5 TRISE4 TRISE3 TRISE2 TRISE1 TRISE0 1111 1111 60, 148 TRISD TRISD7 TRISD6 TRISD5 TRISD4 TRISD3 TRISD2 TRISD1 TRISD0 1111 1111 60, 143 TRISC TRISC7 TRISC6 TRISC5 TRISC4 TRISC3 TRISC2 TRISC1 TRISC0 1111 1111 60, 140 TRISB TRISB7 TRISB6 TRISB5 TRISB4 TRISB3 TRISB2 TRISB1 TRISB0 1111 1111 60, 137 TRISA TRISA7 LATJ LATH LATG LATF LATF7 LATF6 LATF5 LATF4 LATF3 LATF2 LATF1 LATF0 xxxx xxxx 60, 149 LATE LATE7 LATE6 LATE5 LATE4 LATE3 LATE2 LATE1 LATE0 xxxx xxxx 60, 146 LATD LATD7 LATD6 LATD5 LATD4 LATD3 LATD2 LATD1 LATD0 xxxx xxxx 60, 143 LATC LATC7 LATC6 LATC5 LATC4 LATC3 LATC2 LATC1 LATC0 xxxx xxxx 60, 140 LATB LATB7 LATB6 LATB5 LATB4 LATB3 LATB2 LATB1 LATB0 xxxx xxxx 60, 137 LATA LATA7

(2)

2: These re gisters and/or bits are not implemented on 64-pin devices and are read as

3: The PLLEN bit is only available in specific oscillator configuration; otherwise, it is disabled and reads as

4: RA6/RA7 and their associated latch and direction bits are individually configured as port pins based on various primary oscillator modes.

— — — — — — EEPROM Address

— FREE WRERR WREN WR RD xx-0 x000 59, 89

— EEIP BCL1IP HLVDIP TMR3IP CCP2IP 11-1 1111 60, 131 — EEIF BCL1IF HLVDIF TMR3IF CCP2IF 00-0 0000 60, 125 — EEIE BCL1IE HLVDIE TMR3IE CCP2IE 00-0 0000 60, 128

EBDIS —WAIT1WAIT0— —WM1WM00-00 --00 60, 96

TRISJ7 TRISJ6 TRISJ5 TRISJ4 TRISJ3 TRISJ2 TRISJ1 TRISJ0 1111 1111 60, 157

TRISH7 TRISH6 TRISH5 TRISH4 TRISH3 TRISH2 TRISH1 TRISH0 1111 1111 60, 155

— — — TRISG4 TRISG3 TRISG2 TRISG1 TRISG0 ---1 1111 60, 153

(4)

LATJ7LATJ6LATJ5LATJ4LATJ3LATJ2LATJ1LATJ0xxxx xxxx 60, 156 LATH7 LATH6 LATH5 LATH4 LATH3 LATH2 LATH1 LATH0 xxxx xxxx 60, 154

— —LATG5

(4)

TRISA6

LATA6

(3)

(4)

— TUN4 TUN3 TUN2 TUN1 TUN0 00-0 0000 35, 60

TRISA5 TRISA4 TRISA3 TRISA2 TRISA1 TRISA0 1111 1111 60, 135

(5)

LATG4 LATG3 LATG2 LATG1 LATG0 --xx xxxx 60, 151

LATA5 LATA4 LATA3 LATA2 LATA1 LATA0 xxxx xxxx 60, 135

‘0’. Reset values are shown for 80-pin devices;

individual unimplemented bits should be interpreted as ‘-’.

‘0’. See Section2.6.4 “PLL in

INTOSC Modes”.

When disabled, these bits read as ‘0’.

Value on

POR, BOR

---- --00 59, 111

Details

on page:

‘0’.

DS39646B-page 78 Preliminary  2004 Microchip Technology Inc.

PIC18F8722 FAMILY

TABLE 5-3: REGISTER FILE SUMMARY (CONTINUED)

File Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

(2)

PORTJ

(2)

PORTH PORTG PORTF RF7 RF6 RF5 RF4 RF3 RF2 RF1 RF0 x000 0000 60, 149 PORTE RE7 RE6 RE5 RE4 RE3 RE2 RE1 RE0 xxxx xxxx 60, 146 PORTD RD7 RD6 RD5 RD4 RD3 RD2 RD1 RD0 xxxx xxxx 60, 143 PORTC RC7 RC6 RC5 RC4 RC3 RC2 RC1 RC0 xxxx xxxx 60, 140 PORTB RB7 RB6 RB5 RB4 RB3 RB2 RB1 RB0 xxxx xxxx 60, 137 PORTA RA7 SPBRGH1 EUSART1 Baud Rate Generator Register High Byte 0000 0000 61, 252 BAUDCON1 ABDOVF RCIDL SPBRGH2 EUSART2 Baud Rate Generator Register High Byte 0000 0000 61, 252 BAUDCON2 ABDOVF RCIDL ECCP1DEL P1RSEN P1DC6 P1DC5 P1DC4 P1DC3 P1DC2 P1DC1 P1DC0 0000 0000 61, 200 TMR4 Timer4 Register 0000 0000 61, 178 PR4 Timer4 Period Register 1111 1111 61, 178 T4CON CCPR4H Capture/Co mpar e/P W M Regi s ter 4 Hig h Byte xxxx xxxx 61, 180 CCPR4L C ap tur e/Co mpare/PWM Register 4 Low Byte xxxx xxxx 61, 180 CCP4CON CCPR5H Capture/Co mpar e/PW M Regi s ter 5 Hig h Byte xxxx xxxx 61, 180 CCPR5L C ap tur e/Co mpare/PWM Register 5 Low Byte xxxx xxxx 61, 180 CCP5CON SPBRG2 EUSART2 Baud Rate Generator Register Low Byte 0000 0000 61, 252 RCREG2 EUSART2 Receive Register 0000 0000 61, 260 TXREG2 EUSART2 Transmit Register 0000 0000 61, 257 TXSTA2 CSRC TX9 TXEN SYNC SENDB BRGH TRMT TX9D 0000 0010 61, 248 RCSTA2 SPEN RX9 SREN CREN ADDEN FERR OERR RX9D 0000 000x 61, 249 ECCP3AS ECCP3ASE ECCP3AS2 ECCP3AS1 ECCP3AS0 PSS3AC1 PSS3AC0 PSS3BD1 PSS3BD0 0000 0000 61, 201 ECCP3DEL P3RSEN P3DC6 P3DC5 P3DC4 P3DC3 P3DC2 P3DC1 P3DC0 0000 0000 61, 200 ECCP2AS ECCP2ASE ECCP2AS2 ECCP2AS1 ECCP2AS0 PSS2AC1 PSS2AC0 PSS2BD1 PSS2BD0 0000 0000 61, 201 ECCP2DEL P2RSEN P2DC6 P2DC5 P2DC4 P2DC3 P2DC2 P2DC1 P2DC0 0000 0000 61, 200 SSP2BUF MSSP2 Receive Buffer/Transmit Register xxxx xxxx 61, 170 SSP2ADD MSSP2 Address Register in I

SSP2STAT SMP CKE D/A SSP2CON1 WCOL SSPOV SSPEN CKP SSPM3 SSPM2 SSPM1 SSPM0 0000 0000 61, 217 SSP2CON2 GCEN ACKSTAT ACKDT ACKEN RCEN PEN RSEN SEN 0000 0000 61, 218

2: These re gisters and/or bits are not implemented on 64-pin devices and are read as

3: The PLLEN bit is only available in specific oscillator configuration; otherwise, it is disabled and reads as

4: RA6/RA7 and their associated latch and direction bits are individually configured as port pins based on various primary oscillator modes.

RJ7 RJ6 RJ5 RJ4 RJ3 RJ2 RJ1 RJ0 xxxx xxxx 60, 156

RH7 RH6 RH5 RH4 RH3 RH2 RH1 RH0 0000 xxxx 60, 154

— —RG5

(4)

— T4OUTPS3 T4OUTPS2 T4OUTPS1 T4OUTPS0 TMR4ON T4CKPS1 T4CKPS0 -000 0000 61, 178

— — DC4B1 DC4B0 CCP4M3 CCP4M2 CCP4M1 CCP4M0 --00 0000 61, 179

— — DC5B1 DC5B0 CCP5M3 CCP5M2 CCP5M1 CCP5M0 --00 0000 61, 179

RA6

(4)

(5)

RA5 RA4 RA3 RA2 RA1 R A0 xx0x 0000 61, 135

— SCKP BRG16 —WUEABDEN01-0 0-00 61, 250

C™ Slave mode. MSSP2 Baud Rate Reload Register in I2C Master mode. 0000 0000 61, 170

RG4 RG3 RG2 RG1 RG0 --xx xxxx 60, 151

PSR/WUA BF 0000 0000 61, 216

‘0’. Reset values are shown for 80-pin devices;

individual unimplemented bits should be interpreted as ‘-’.

‘0’. See Section2.6.4 “PLL in

INTOSC Modes”.

When disabled, these bits read as ‘0’.

Value on

POR, BOR

Details

on page:

‘0’.

 2004 Microchip Technology Inc. Preliminary DS39646B-page 79

PIC18F8722 FAMILY

5.3.5 STATUS REGISTER

The STATUS register, shown in Register5-2, contains the arithmetic status of the ALU. As wi th any other SFR, it can be the operand for any instruction.

If the STA TUS register is the destination for an instruction that affects the Z, DC, C, OV or N bits, the results of the instruction are not written; instead, the STATUS register is updated a ccording t o the i nstructio n perfor med. There fore, the result of an inst ruction with th e STA TUS re gister as its destinat ion may b e differe nt than inten ded. As an example, CLRF STATUS will set the Z bit and leave the remaining Status bits unchanged (‘000u u1uu’).

It is recommended that only BCF, BSF, SWAPF, MOVFF and MOVWF instructions are used to alter the STATUS register , b ecaus e thes e ins tructi ons d o not af fect t he Z, C, DC, OV or N bits in the STATUS register.

For other instructions that do not affect S tatus bits, see the instruction set summaries in Table 26-2 and Table 26-3.

Note: The C and DC bits operate as the borrow

and digit borrow bits, respectively, in subtraction.

REGISTER 5-2: STATUS: ARITHMETIC STATUS REGISTER

U-0 U-0 U-0 R/W-x R/W-x R/W-x R/W-x R/W-x

— — —NOVZDCC

bit 7 bit 0

bit 7-5 Unimplemented: Read as ‘0’ bit 4 N: Negative bit

This bit is used for signed arithmetic (2’s complement). It indicates whether the result was negative (ALU MSB = 1).

1 = Result was negative 0 = Result was positive

bit 3 OV: Overflow bit

This bit is used for signed arithmetic (2’s complement). It indicates an overflow of the 7-bit magnitude which causes the sign bit (bit 7 of the result) to change state.

1 = Overflow occurred for signed arithmetic (in this arithmetic operation) 0 = No overflow occurred

bit 2 Z: Zero bit

1 = The result of an arithmetic or logic operation is zero 0 = The result of an arithmetic or logic operation is not zero

bit 1 DC: Digit Carry/borrow

For ADDWF, ADDLW, SUBLW and SUBWF instructions:

1 = A carry-out from the 4th low-order bit of the result occurred 0 = No carry-out from the 4th low-order bit of the result

Note: For borrow,

2’s complement of the second operand. For rotate (RRF, RLF) instructions, this bit is loaded with either bit 4 or bit 3 of the source register.

bit 0 C: Carry/borrow

For ADDWF, ADDLW, SUBLW and SUBWF instructions:

1 = A carry-out from the Most Significant bit of the result occurred 0 = No carry-out from the Most Significant bit of the result occurred

Note: For borrow,

2’s complement of the second operand. For rotate (RRF, RLF) instructions, this bit is loaded with either the high or low-order bit of the source register.

bit

the polarity is reversed. A subtraction is executed by adding the

bit

the polarity is reversed. A subtraction is executed by adding the

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

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5.4 Data Addressing Modes

Note: The execution of some instructions in the

core PIC18 instruction set are changed when the PIC18 extended instruction set is enabled. See Section 5.5 “Data Memory and the Extended Instruction Set” for more information.

The data memory space can be addr essed in se veral ways. For most instructions, the addressing mode is fixed. Other instructions may use up to three modes, depending on whic h operands are used and whe ther or not the extended instruction set is enabled.

The addressing modes are:

• Inherent

• Literal

•Direct

•Indirect An additional addressing mode, Indexed Literal Offset,

is available when the extended instruction set is enabled (XINST configuration bit = 1). Its operation is discussed in greater detail in Section 5.5.1 “Indexed Addressing with Literal Offset”.

5.4.1 INHERENT AND LITERAL ADDRESSING

Many PIC18 control instructions do not need any argument at all; they either perform an operation that globally affects the device or they operate implicitly on one register. This addressing mode is known as Inherent Addressing. Examples include SLEEP, RESET and DAW.

Other instructions work in a similar way but require an additional explicit argument in the opcode. This is known as Literal Addressing mode because they require some literal value as an argument. Examples include ADDLW and MOVLW, which respectively, add or move a literal value to the W register. Other examples include CALL and GOTO, which include a 20-bit program memory address.

5.4.2 DIRECT ADDRESSING

Direct addressing specifies all or part of the source and/or destination address of the operation within the opcode itself. The options are specified by the arguments accompanying the instruction.

In the core PIC18 inst ruct ion se t, bit-ori ented and by teoriented instructions use some version of direct addressing by default. All of these instructions include some 8-bit literal address as their Least Significant Byte. This address spec ifies either a re gister address in one of the banks of d ata RAM ( Section 5.3.3 “General Purpose Register File”) or a location in the Access Bank (Section 5.3.2 “Access Bank”) as the data source for the instruction.

The Access RAM bit ‘a’ determines how the address i s interpreted. When ‘a’ is ‘1’, the contents of the BSR (Section 5.3.1 “Bank Select Register (BSR)”) are used with the address t o determin e the comple te 12-bit address of the reg ister. When ‘a’ is ‘0’, the address is interpreted as being a register in the Access Bank. Addressing that uses the Access RAM is sometimes also known as Direct Forced Addressing mode.

A few instructions, such as MOVFF, include the entire 12-bit address (either source or destination) in their opcodes. In these cases, the BSR is ignored entirely.

The destination of the operati on’s results is determined by the destination bit ‘d ’. Wh en ‘d’ is ‘1’, the results are stored back in t he s o ur c e re g is ter, over wr iti n g i ts or i gi nal contents. When ‘d’ is ‘0’, the results are stored in the W register. Instructions without the ‘d’ argument have a destin ation tha t is i mplicit in the inst ruction; their destination is either the target register being operated on or the W register.

5.4.3 INDIRECT ADDRESSING

Indirect addressi ng allows the user to acces s a locatio n in data memory without giving a fixed address in the instruction. This is done by using File Select Registers (FSRs) as pointers to the location s to be read or written to. Since the FSRs are themselves located in RAM as Special File Reg isters , they can also be directl y mani pulated under program control. This makes FSRs very useful in imp lem ent ing data str uct ures , s uch as tabl es and arrays in data memory.

The registers for indirect addressing are also implemented with Indirect File Operands (INDFs) that permit automatic mani pulati on of the poi nter val ue wi th auto-incrementing, auto-decrementing or offsetting with another va lue . Th is al lo ws f or e fficient code, using loops, such as the example of clearing an entire RAM bank in Example 5-5.

EXAMPLE 5-5: HOW TO CLEAR RAM

(BANK 1) USING INDIRECT ADDRESSING

LFSR FSR0, 100h ;

NEXT CLRF POSTINC0 ; Clear INDF

; register then ; inc pointer

BTFSS FSR0H, 1 ; All done with

; Bank1?

BRA NEXT ; NO, clear next

CONTINUE ; YES, continue

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5.4.3.1 FSR Registers and the INDF Operand

At the core of indirect addressing are three sets of registers: FSR0, FSR1 and FSR2. Each represents a pair of 8-bit registers, FSRnH and FSRnL. The four upper bits of the FSRnH register are not used so each FSR pair holds a 12-bi t va lue. T his repre sen ts a value that can address the entire range of the data memory in a linear fashion. The FSR register pairs, then, serve as pointers to data memory locations.

Indirect addressing is accomplished with a set of Indirect File Operands, INDF0 through INDF2. These can be thought of as “virtual” registers: they are mapped in the SFR space but are not phys ic all y im pl emented. Reading or writin g to a particular INDF reg ister actually accesses its corresponding FSR register pair. A read from INDF1, for example, reads the data at the address indi cated by FSR 1H:FSR1L. Instructi ons that use the IND F registers as operands actual ly use the contents of th eir co rrespon ding FS R as a poin ter to th e instruction’s target. The INDF operand is just a convenient way of using the pointer.

Because indirec t addre ssing us es a full 1 2-bit a ddress , data RAM banking is not necessary. Thus, the current contents of the BSR and the Access RAM bit have no effect on determining the target address.

5.4.3.2 FSR Registers and POSTI NC, POSTDEC, PREINC and PLUSW

In addition to the IND F operand, eac h FSR register pair also has four additional indirect operands. Like INDF, these are “virtual” registers that cannot be indirectly read or written to. Accessing these registers actually accesses the associated FSR register pair, but also performs a specifi c action on it s stored v alue. They ar e:

• POSTDEC: accesses the FSR value, then

automatically decrements it by 1 afterwards

• POSTINC: accesses the FSR value, then

automatically increments it by 1 afterwards

• PREINC: increments the FSR value by 1, then

uses it in the operation

• PLUSW: adds the signed value of the W register

(range of -127 to 128) t o that of th e FSR and uses the new value in the operation.

In this context, accessing an INDF register uses the value in the FSR registers without changing them. Similarly, accessing a PLUSW register gives the FSR value offset by the valu e in the W register; neithe r value is actually changed in the operation. Accessing the other virtual registers changes the value of the FSR registers.

Operations on the FSRs with POSTDEC, POSTINC and PREINC affect the entire register pair; that is, rollovers of the FSRnL register from FFh to 00h ca rry over to the FSRnH register. On the other hand, results of these operations do not change the value of any flags in the STATUS register (e.g., Z, N, OV, etc.).

FIGURE 5-8: INDIR ECT ADDRESSING

Using an instruction with one of the indirect addressing registers as the

operand....

...uses the 12-bit address stored in the FSR pair associated with that

xxxx1110 11001100

...to determine the data memory location to be used in that operation.

In this case, the FSR1 pair contains ECCh. This means the contents of location ECCh will be added to that of the W register and stored back in ECCh.

ADDWF, INDF1, 1

FSR1H:FSR1L

000h

Bank 0

100h

200h

300h

E00h

F00h

FFFh

Bank 1

Bank 2

Bank 3

through

Bank 13

Bank 14

Bank 15

Data Memory

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The PLUSW register can be used to implement a form of indexed addressing in t he data memory space. By manipulating the value in the W register, users can reach addresses that are fixed offsets from pointer addresses. In some applications, this can be used to implement some powerful program control structure, such as softw are stacks, inside of data memory.

5.4.3.3 Operations by FSRs on FSRs

Indirect addressing operations that target other FSRs or virtual registers represent special cases. For example, using an FSR to point to on e of the virtual regis ters will not result in successful operations. As a specific case, assume that FSR0H:FSR0L contains FE7h, the address of INDF1. Attempts to read the value of the INDF1 using INDF0 as an operand will return 00h. Attempts to write to INDF1 using I NDF0 as the operan d will result in a NOP.

On the other ha nd, u sing the v irtual reg isters to w rite to an FSR pair may n ot oc cur as plan ned. I n t hese cases , the value will be written to the FSR p air bu t withou t any incrementing or decrementing. Thus, writing to INDF2 or POSTDEC2 will write the same value to the FSR2H:FSR2L.

Since the FSRs are physical registers mapped in the SFR space, they can be manipulated through all direct operations. Users should proceed cautiously when working on these registers, particularly if their code uses indirect addressing.

Similarly, operations by indirect addressing are generally permitted on all other SFRs. U sers shoul d exercise the appropriate caution that they do not inadvertently change settings that might affect the operation of the device.

5.5 Data Memory and the Extended Instruction Set

Enabling the PIC18 extended instruction set (XINST configuration bit = 1) significantly changes certain aspects of data memory and its addressing. Specifically, the use of the Access Bank for many of the core PIC18 instructions is different; this is due to the introduction of a new addressing mode for the data memory space.

What does not change is just as im po rtant. The size of the data memory space is unchanged, as well as its linear addressing. The SFR map remains the same. Core PIC18 instructions can still operate in both Direct and Indirect Addressing mode; inherent and literal instructions do not change at all. Indirect addressing with FSR0 and FSR1 also remain unchanged.

5.5.1 INDEXED ADDRESSING WITH LITERAL OFFSET

Enabling the PIC18 extended instruction set changes the behavior of indirect addressing using the FSR2 register pair within Access RAM. Under the proper conditions, instruc tions that us e the Access Ban k – that is, most bit-oriented and byte-oriented instructions – can invoke a form of indexed addressing using an offset specified in the in structi on. Thi s spe cial addr ess ing mode is known as Indexed Addressing with Literal Offset, or Indexed Literal Offset mode.

When using the extended instruction set, this addressing mode requires the following:

• The use of the Access Ban k i s fo rced (‘a ’ = 0) an d

• The file address argument is less than or equal to

5Fh.

Under these conditions, the file address of the instruction is not interpreted as the lower byte of an address (used with the BSR in direct addre ssing), or as an 8-bit address in the Access Bank. Instead, the value is interpreted as an offset value to an address pointer, specified by FSR2. The offset and the contents of FSR2 are added to obtain the target address of the operation.

5.5.2 INSTRUCTIONS AFFECTED BY INDEXED LITERAL OFFSET MODE

Any of the core PIC18 instructions that can use direct addressing are potentially affected by the Indexed Literal Offset Addressing mode. This includes all byte-oriented and bit-oriented instructions, or almost one-half of the standard PIC18 instruction set. Instructions that onl y use Inherent or Literal Addr essing modes are unaffecte d.

Additionally, byte-oriented and bit-oriented instructions are not affected if they do not use the Access Bank (Access RAM bit is ‘1’), or include a fi le address of 60h or above. Instructions meeting these criteria will continue to execute as be fore. A comp aris on of the di fferent possible addressing modes when the extended instruction set is enabled in shown in Figure 5-9.

Those who desire to use byte-oriented or bit-oriented instructions in the Indexed Literal Offset mode should note the changes to assembler syntax for this mode. This is described in more detail in Section 26.2.1 “Extended Instruction Syntax”.

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FIGURE 5-9: COMPARING ADDRESSING OPTIONS FOR BIT-ORIENTED AND

BYTE-ORIENTED INSTRUCTIONS (EXTENDED INSTRUCTION SET ENABLED)

EXAMPLE INSTRUCTION: ADDWF, f, d, a (Opcode: 0010 01da ffff ffff)

When ‘a’ = 0 and f ≥ 60h:

The instruction executes in Direct Forced mode. ‘f’ is interpreted as a location in the Access RAM between 060h and 0FFh. This is the sam e as locations 060h to 07Fh (Bank 0) and F80h to FFFh (Bank 15) of data memory.

Locations below 60h are not available in this addressing mode.

When ‘a’ = 0 and f ≤ 5Fh:

The instruction executes in Indexed Literal Offset mode. ‘f’ is interpreted as an offset to the address value in FSR2. The two are added together to obtain the address of the target register for the instruction. The address can be anywhere in the data memory space.

Note that in this mode, the correct syntax is now:

ADDWF [k], d

where ‘k’ is the same as ‘f’.

000h 060h

080h

100h

F00h

F80h

FFFh

000h

080h

100h

F00h

F80h

FFFh

Bank 0

Bank 1

through

Bank 14

Bank 15

SFRs

Data Memory

Bank 0

Bank 1

through

Bank 14

Bank 15

SFRs

Data Memory

00h 60h

80h

Access RAM

FSR2H FSR2L

FFh

ffffffff001001da

Valid range

for ‘f’

BSR

00000000

ffffffff001001da

When ‘a’ = 1 (all values of f):

The instruction executes in Direct mode (also known as Direct Long mode). ‘f’ is interpreted as a location in one of the 16 banks of the data memory space. The bank is designated by the Bank Sel ect

000h

080h

100h

Bank 0

Bank 1

through

Bank 14

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F00h

F80h

FFFh

Bank 15

SFRs

Data Memory

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5.5.3 MAPPING THE ACCESS BANK IN INDEXED LITERAL OFFSET MODE

The use of Indexed Literal Offset Addressing mode effectively chan ges how the first 96 locati ons of Access RAM (00h to 5Fh) are m ap ped . R at her tha n c on t ai nin g just the contents of the bottom half of Bank 0, this mode maps the contents from Bank 0 and a user defined “window” that can be located anywhere in the data memory space. The value of FSR2 establishes the lower boundary of the addresses mapped into the window, while the upper boundary is defined by FSR2 plus 95 (5Fh). Addresses in the Access RAM above

Remapping of the Access Bank applies only to operations using the I ndexed Lite ral Offs et mode. Ope rations that use the BSR (Access RAM bit is ‘1’) will continue to use direct addressing as before.

5.6 PIC18 Instruction Execution and the Extended Instruction Set

Enabling the extended instruction set adds eight

additional commands to the existing PIC18 instruction

set. These instructions are executed as described in Section 26.2 “Extended Instruction Set”.

5Fh are mapped as previously described (see Section 5.3.2 “Access Bank”). An example of Access Bank remapping in this addressing mode is shown in Figure 5-10.

FIGURE 5-10: REMAPPING THE ACCESS BANK WITH INDEXED LITERAL

OFFSET ADDRESSING

Example Situation:

ADDWF f, d, a

FSR2H:FSR2L = 120h

Locations in the region from the FSR2 pointer (120h) to the pointer plus 05Fh (17Fh) are mapped to the bottom of the Access RAM (000h-05Fh).

Locations in Bank 0 from 060h to 07Fh are mapped, as usual, to the middle half of the Access Bank.

Special File Registers at F80h through FFFh are mapped to 80h through FFh, as usual.

Bank 0 addresses below 5Fh can still be addressed by using the BSR.

000h 05Fh 07Fh

100h

120h 17Fh

200h

F00h

F80h

FFFh

Bank 0

Bank 0 Bank 1

Window

Bank 1

Bank 2

through

Bank 14

Bank 15

SFRs

Data Memory

Bank 1 “Window”

Bank 0

SFRs

Access Bank

00h

5Fh 7Fh

80h

FFh

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NOTES:

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6.0 FLASH PROGRAM MEMORY

The Flash program memory is readable, writable and erasable during normal operation over the entire V range.

A read from program memory is executed on one byte at a time. A write to program memory is executed on blocks of 64 bytes at a time. Program memory is erased in blocks of 64 bytes at a time. A bulk erase operation may not be issued from user code.

Writing or erasing program memory will cease instruction fetches until the operation is complete. The program memory cannot be accessed during the write or erase, therefore, code cannot execute. An internal programming timer terminates program memory writes and erases.

A value written to progra m memory does not nee d to be a valid instruction. Executing a program memory location that forms an invalid instruction results in a NOP.

6.1 Table Reads and Table Writes

In order to read and write program memory, there are two operations that allow the processor to move bytes between the program memory sp ace and the dat a RAM:

• Table Read (TBLRD)

• Table Write (TBLWT) The program memory space is 16 bits wide, while the

data RAM space is 8 bits wide. Table reads and table writes move data between these two memory spaces through an 8-bit register (TABLAT).

Table read operations retrieve data from program memory and place it into the data RAM space. Figure 6-1 shows the operation of a table read with program memory and data RAM.

Table wri te oper at ions s tore d ata fr om t he data me mor y space into holding registers in program memory. The

procedure to write the contents of the holding registers

into program memory is detailed in Section 6.5 “Writing to Flash Program Memory”. Figure 6-2 shows the operation of a table write with program memory and data RAM.

Table operations work with byte entities. A table block containing data, rather than program instructions, is not required to be word aligned. Therefore, a table block can start and end at any byte address. If a t able write is being used to write executable code into program memory, program instructions will need to be word aligned.

FIGURE 6-1: TABLE READ OPERATION

Table Pointer

TBLPTRU

Note 1: Table Pointer register points to a byte in program memory.

TBLPTRH TBLPTRL

(1)

Program Memory (TBLPTR)

Instruction: TBLRD*

Program Memory

Table Latch (8-bit)

TABLAT

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FIGURE 6-2: TABLE WRITE OPERATION

Instruction: TBLWT*

Program Memory

Table Pointer

TBLPTRU

Note 1: Table Pointer actually points to one of 64 holding r egisters, the address of which is determined by

TBLPTRH TBLPTRL

TBLPTRL<5:0>. The process for physically writing data to the program memory array is discussed in

Section 6.5 “Writing to Flash Program Memor y ”.

(1)

Program Memory (TBLPTR)

Holding Registers

Table Latch (8-bit)

TABLAT

6.2 Control Registers

Several control registers are used in conjunction with the TBLRD and TBLWT instructions. These include the:

• EECON1 register

• EECON2 register

• TABLAT register

• TBLPTR registers

6.2.1 EECON1 AND EECON2 REGISTERS

The EECON1 register (Register 6-1) is the control register for memory acce sses. The EECO N2 register is not a physical register; it is used exclusively in the memory write and erase sequences. Reading EECON2 will read all ‘0’s.

The EEPGD control bit determines if th e access will be a program or data EEPROM memory access. When clear, any subsequent operations will operate on the data EEPROM memory. When set, any subsequent operations will operate on the program memory.

The CFGS control bit determines if the access will be to the Configuration/C alib ration re giste rs or to pro gram memory/data EEPROM memory. When set, subsequent operations will operate on Configuration registers regardless of EEPGD (see Section 25.0 “Special Features of t he CPU”). Wh en clear , memory selection access is determined by EEPGD.

The FREE bit, when set, will allow a program memory erase operation. When FREE is set, the erase operation is initiated on the next WR command. When FREE is clear , only wr ite s are enab led .

The WREN bit, when set, will allow a write operation. On power-up, the WREN bit is c lear . T he WRERR bit is set in hardware when the WR bit is set and cleared when the internal programming timer expires and the write operation is complete.

Note: During normal operation, the WRERR is

read as ‘1’. This can indicate that a write operation was prematurely terminated by a Reset, or a write operation was attempted improperly.

The WR control bit initiates write operations. The bit cannot be cleared, only set, in software; it is cleared in hardware at the completion of the write operation.

Note: The EEIF interrupt flag bit (PIR2<4>) is set

when the write is complete. It must be cleared in software.

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REGISTER 6-1: EECON1: EEPROM CONTROL REGISTER 1

R/W-x R/W-x U-0 R/W-0 R/W-x R/W-0 R/S-0 R/S-0

EEPGD CFGS — FREE WRERR WREN WR RD

bit 7 bit 0

bit 7 EEPGD: Flash Program or Data EEPROM Memory Select bit

1 = Access Flash program memory 0 = Access data EEPROM memory

bit 6 CFGS: Flash Program/Data EEPROM or Configuration Select bit

1 = Access Configuration registers 0 = Access Flash program or data EEPROM memory

bit 5 Unimplemented: Read as ‘0’ bit 4 FREE: Flash Row Erase Enable bit

1 = Erase the program memory row addressed by TBLPTR on the next WR command

(cleared by completion of erase operation)

0 = Perform write only

bit 3 WRERR: Flash Program/Data EEPROM Error Flag bit

1 = A write operation is prematurely terminated (any Reset during self-timed programming in

normal operation, or an improper write attempt)

0 = The write operation completed

Note: When a WRERR occurs, the EEPGD and CFGS bits are not cleared.

This allows tracing of the error condition.

bit 2 WREN: Flash Program/Data EEPROM Write Enable bit

1 = Allows write cycles to Flash program/data EEPROM 0 = Inhibits write cycles to Flash program/data EEPROM

bit 1 WR: Write Control bit

1 = Initiates a data EEPROM erase/write cycle or a program memory erase cycle or write cycle.

(The operation is self-timed and the bit is cleared by hardware once write is complete. The WR bit can only be set (not cleared) in software.)

0 = Write cycle to the EEPROM is complete

bit 0 RD: Read Control bit

1 = Initiates an EEPROM read (Read t akes one cycle. RD is cleared in ha rdware. The RD bit can

only be set (not cleared) in software. RD bit cannot be set when EEPGD = 1 or CFGS = 1.)

0 = Does not initiate an EEPROM read

Legend:

R = Readable bit W = Writable bit S = Bit can be set by software, but not cleared U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

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6.2.2 TABLAT – TABLE LATCH REGISTER

The Table Latch (TABLAT) is an 8-bit register mapped into the SFR space. The Table Latch register is used to hold 8-bit data during data transfers between program memory and data RAM.

6.2.3 TBLPTR – TABLE POINTER REGISTER

The Table Pointer (TBLPTR) reg is ter ad dre ss es a by te within the program memory. The TBLPTR is comprised of three SFR registers : Table Pointer Upper Byte, Table Pointer High Byte and Table Pointer Low Byte (TBLPTRU:TBLPTRH:TBLPTRL). These three registers join to form a 22-bit wide po inter. The low-order 21 bits allow the device to address up to 2 Mbytes of program memory sp ace. Th e 22nd b it allow s acce ss to the device ID, the user ID and the configuration bits.

The Table Pointer register, TBLPTR, is used by the TBLRD and TBLWT instructi ons . T hes e i ns truc tio ns ca n update the TBLPTR in one of four ways based on the table operation. These operations are shown in T abl e 6-1. These operations on the TBLPTR only af fect the low-order 21 bits.

6.2.4 TABLE POINTER BOUNDARIES

TBLPTR is used in reads, writes and erases of the Flash program memory.

When a TBLRD is executed, all 22 bits of the TBLPTR determine which byte is read from program memory into TABL AT.

When a TBLWT is executed, the six LSbs of the Table Pointer register (TBLP TR<5:0>) determine which of the 64 program memory holding registers is written to. When the timed write to program memory begins (via the WR bit), the 16 MSbs of the TBLPTR (TBLPTR<21:6>) determine which program memory block of 64 bytes is written to. For more detail, see Section 6.5 “Writing to Flash Program Memory”.

When an erase of program memory is executed, the 16 MSbs of the Table Pointer register (TBLPTR<21:6>) point to the 64-byte block that will be erased . The Least Significant bits (TBLPTR<5:0>) are ignored.

Figure 6-3 describes the relevant boundaries of TBLPTR based on Flash program memory operations.

TABLE 6-1: TABLE POINTER OPERATIONS WITH TBLRD AND TBLWT INSTRUCTIONS

Example Operation on Table Pointer

TBLRD* TBLWT*

TBLRD*+ TBLWT*+

TBLRD*TBLWT*-

TBLRD+* TBLWT+*

TBLPTR is incremented after the read/write

TBLPTR is decremented after the read/write

TBLPTR is incremented before the read/write

TBLPTR is not modified

FIGURE 6-3: TABLE POINTER BOUNDARIES BASED ON OPERATION

21 16 15 87 0

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TBLPTRU

TABLE ERASE/WRITE

TABLE READ – TBLPTR<21:0>

TBLPTRLTBLPTRH

TABLE WRITE

TBLPTR<5:0>TBLPTR<21:6>

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6.3 Reading the Flash Program Memory

The TBLRD instruction is used to retrieve data from program memory and places it into data RAM. Table reads from program memory are pe rformed one by te at a time.

TBLPTR points to a byte address in program space. Executing TBLRD places the byte pointed to into TABLAT. In addition, TBLPTR can be modified automatically for the next table read operation.

The internal program memory is typically organize d by words. The Least Significant b it of th e address selects between the high and low bytes of the word. Figure 6-4 shows the interface between the internal program memory and the TABLAT.

FIGURE 6-4: READS FROM FLASH PROGRAM MEMORY

Program Memory

(Even Byte Address)

(Odd Byte Address)

TBLPTR = xxxxx1

Instruction Register

(IR)

FETCH

TBLRD

EXAMPLE 6-1: READING A FLASH PROGRAM MEMORY WORD

MOVLW CODE_ADDR_UPPER ; Load TBLPTR with the base MOVWF TBLPTRU ; address of the word MOVLW CODE_ADDR_HIGH MOVWF TBLPTRH MOVLW CODE_ADDR_LOW MOVWF TBLPTRL

READ_WORD

TBLRD*+ ; read into TABLAT and increment MOVF TABLAT, W ; get data MOVWF WORD_EVEN TBLRD*+ ; read into TABLAT and increment MOVF TABLAT, W ; get data MOVF WORD_ODD

TBLPTR = xxxxx0

TABLAT

Read Register

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6.4 Erasing Flash Program Memory

The minimum eras e block is 32 wo rds or 64 b ytes. Only through the use of an external programmer, or through ICSP control, can larger blocks of program memory be bulk erased. Word erase in the Flash array is not supported.

When initiating an erase sequence from the microcontroller itself, a blo ck of 64 bytes of program memo ry is erased. The Most Significant 16 bits of the TBLPTR<21:6> point to the block being erased. TBLPTR<5:0> are ignored.

The EECON1 register comma nds the erase operation. The EEPGD bit must be set to point to the Flash program memory. The WREN bit must be set to enable write operations. The F REE bit is set to select an erase operation.

For protection, the wri te i ni tiat e s equ enc e f or EECO N2 must be used.

A long write is nec essa ry for erasin g the i nternal Flash. Instruction execution is halted while in a long write

6.4.1 FLASH PROGRAM MEMORY ERASE SEQUENCE

The sequence of events for erasing a block of internal program memory location is:

1. Load Table Pointer register with address of row

being erased.

2. Set the EECON1 register for the erase operation:

• set EEPGD bit to point to program memory;

• clear the CFGS bit to access program memory;

• set WREN bit to enable writes;

• set FREE bit to enable the erase.

3. Disable interrupts.

4. Write 55h to EECON2.

5. Write 0AAh to EECON2.

6. Set the WR bit. This will begin the row erase

cycle.

7. The CPU will stall for duration of the erase for

TIW (see parameter D133 A).

8. Re-enable interrupts.

cycle. The long write will be terminated by the internal programming timer.

EXAMPLE 6-2: ERASING A FLASH PROGRAM MEMORY ROW

MOVLW CODE_ADDR_UPPER ; load TBLPTR with the base MOVWF TBLPTRU ; address of the memory block MOVLW CODE_ADDR_HIGH MOVWF TBLPTRH MOVLW CODE_ADDR_LOW

ERASE_ROW

Required MOVLW 55h Sequence MOVWF EECON2 ; write 55h

MOVWF TBLPTRL

BSF EECON1, EEPGD ; point to Flash program memory BCF EECON1, CFGS ; access Flash program memory BSF EECON1, WREN ; enable write to memory BSF EECON1, FREE ; enable Row Erase operation BCF INTCON, GIE ; disable interrupts

MOVLW 0AAh MOVWF EECON2 ; write 0AAh BSF EECON1, WR ; start erase (CPU stall) BSF INTCON, GIE ; re-enable interrupts

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6.5 Writing to Flash Program Memory

The minimum programming block is 32 words or 64 bytes. Word or byte programming is not supported.

Table writes are used internally to load the holding registers needed to program the Flash memory. There are 64 holding registers used by the table writes for programming.

Since the Table Latch (T ABLAT) is only a single byte, the TBLWT instruction may need to be executed 64 times for each programming operation. All of the t able w rite ope rations will essentially be short writes because only the holding registers are written. At the end of updating the 64 holding registers, the EECON1 register must be written to in order to start the programming operation with a long write.

The long write is necessary for programming the internal Flash. Instruc tion exe cution is halted w hile in a long write cycle. The long write will be terminated by the internal programming timer.

The EEPROM on-chip timer controls the write time. The write/erase voltages are generated by an on-chip charge pump, rated to operate over the voltage range of the device.

Note: The default value of the holding registers on

device Resets and after write operations is FFh. A write of FFh to a holding register does not modify that byte . This mea ns that individual bytes of program memory may be modified, provided that the change does not attempt to chang e any bi t from a ‘0’ to a ‘1’. When modifying individual bytes, it is not necessary to load all 64 holding registers before executing a write operation.

FIGURE 6-5: TABLE WRITES TO FLASH PROGRAM MEMORY

TABLAT

Write Register

Holding Register Holding Register Holding Register Holding Register

8 8 8

Program Memory

6.5.1 FLASH PROGRAM MEMORY WRITE SEQUENCE

The sequence of events for programming an internal program memory location should b e:

1. Read 64 bytes into RAM.

2. Update data values in RAM as necessary.

3. Load Table Pointer register with address being

erased.

4. Execute the row erase procedure.

5. Load Table Pointer register with address of first

byte being written.

6. Write the 64 bytes into the ho lding regis ters wi th

auto-increment.

7. Set the EECON1 register for the write operatio n:

• set EEPGD bit to point to program memory;

• clear the CFGS bit to access program memory;

• set WREN to enable byte writes.

TBLPTR = xxxxx2

8. Disable interrupts.

9. Write 55h to EECON2.

10. Write 0AAh to EECON2. 1 1. Set the WR bit. This will beg in the wr ite cycle.

12. The CPU will stall for duration of the write for T

13. Re-enable interrupts.

14. Verify the memory (table read). An example of the required code is shown in

Example 6-3 on the follow ing page.

Note: Before setting the WR bit, the Table

TBLPTR = xxxx3FTBLPTR = xxxxx1TBLPTR = xxxxx0

(see parameter D133A).

Pointer address needs to be within the intended address range of the 64 bytes in the holdin g register.

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EXAMPLE 6-3: WRITING TO FLASH PROGRAM MEMORY

MOVLW D'64' ; number of bytes in erase block MOVWF COUNTER MOVLW BUFFER_ADDR_HIGH ; point to buffer MOVWF FSR0H MOVLW BUFFER_ADDR_LOW MOVWF FSR0L MOVLW CODE_ADDR_UPPER ; Load TBLPTR with the base MOVWF TBLPTRU ; address of the memory block MOVLW CODE_ADDR_HIGH MOVWF TBLPTRH MOVLW CODE_ADDR_LOW

READ_BLOCK

MODIFY_WORD

ERASE_BLOCK

Required MOVWF EECON2 ; write 55h Sequence MOVLW 0AAh

WRITE_BUFFER_BACK

WRITE_BYTE_TO_HREGS

MOVWF TBLPTRL

TBLRD*+ ; read into TABLAT, and inc MOVF TABLAT, W ; get data MOVWF POSTINC0 ; store data DECFSZ COUNTER ; done? BRA READ_BLOCK ; repeat

MOVLW DATA_ADDR_HIGH ; point to buffer MOVWF FSR0H MOVLW DATA_ADDR_LOW MOVWF FSR0L MOVLW NEW_DATA_LOW ; update buffer word MOVWF POSTINC0 MOVLW NEW_DATA_HIGH MOVWF INDF0

MOVLW CODE_ADDR_UPPER ; load TBLPTR with the base MOVWF TBLPTRU ; address of the memory block MOVLW CODE_ADDR_HIGH MOVWF TBLPTRH MOVLW CODE_ADDR_LOW MOVWF TBLPTRL BSF EECON1, EEPGD ; point to Flash program memory BCF EECON1, CFGS ; access Flash program memory BSF EECON1, WREN ; enable write to memory BSF EECON1, FREE ; enable Row Erase operation BCF INTCON, GIE ; disable interrupts MOVLW 55h

MOVWF EECON2 ; write 0AAh BSF EECON1, WR ; start erase (CPU stall) BSF INTCON, GIE ; re-enable interrupts TBLRD*- ; dummy read decrement MOVLW BUFFER_ADDR_HIGH ; point to buffer MOVWF FSR0H MOVLW BUFFER_ADDR_LOW MOVWF FSR0L

MOVLW D'64' ; number of bytes in holding register MOVWF COUNTER

MOVFF POSTINC0, WREG ; get low byte of buffer data MOVWF TABLAT ; present data to table latch TBLWT+* ; write data, perform a short write

; to internal TBLWT holding register. DECFSZ COUNTER ; loop until buffers are full BRA WRITE_WORD_TO_HREGS

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EXAMPLE 6-3: WRITING TO FLASH PROGRAM MEMORY (CONTINUED)

PROGRAM_MEMORY

Required MOVWF EECON2 ; write 55h Sequence MOVLW 0AAh

BSF EECON1, EEPGD ; point to Flash program memory BCF EECON1, CFGS ; access Flash program memory BSF EECON1, WREN ; enable write to memory BCF INTCON, GIE ; disable interrupts MOVLW 55h

MOVWF EECON2 ; write 0AAh BSF EECON1, WR ; start program (CPU stall) BSF INTCON, GIE ; re-enable interrupts BCF EECON1, WREN ; disable write to memory

6.5.2 WRITE VERIFY

Depending on the application, good programming practice may dictate that the value written to the memory should be verified against the original value. This should be used in applications where excessive writes can stress bits near the specification limit.

6.5.3 UNEXPECTED TERMINATION OF WRITE OPERATION

If a write is termin ate d b y a n u npl anned event, such as loss of power or an unexpected Reset, the memory location just pr ogrammed shou ld be verifi ed and rep rogrammed if needed. If the wr ite operatio n is interrupte d by a MCLR normal operation, the user can check the WRERR bit and rewrite the location(s) as needed.

Reset or a WDT Time-out Reset during

6.5.4 PROTECTION AGAINST SPURIOUS WRITES

To protect against spurious writes to Flash program memory, the write initiate sequence must also be followed. See Section 25.0 “Sp eci al F eatu re s o f the

CPU” for more detail.

6.6 Flash Program Operation During

Code Protection

See Section 25.5 “Program Verification and Code Protection” for details on code protection of Flash

program memory.

TABLE 6-2: REGISTERS ASSOCIATED WITH PROGRAM FLASH MEMORY

Reset

Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

TBLPTR U TBPLTRH Program Memory Table Pointer High Byte (TBLPTR<15:8>) 57 TBLPTRL Program Memory Table Pointer Low Byte (TBLPTR<7:0>) 57 TABLAT Program Memory Table Latch 57 INTCON GIE/GIEH PEIE/GIEL TMR0IE INT0IE RBIE TMR0IF INT0IF RBIF 57 EECON2 EEPROM Control Register 2 (not a physical register) 59 EECON1 EEPGD CFGS IPR2 OSCFIP CMIP — EEIP BCL1IP HLVDIP TMR3IP CCP2IP 60 PIR2 OSCFIF CMIF — EEIF BCL1IF HLVDIF TMR3IF CCP2IF 60 PIE2

Legend: — = unimplemented, read as ‘0’. Shaded cells are not used during Flash/EEPROM access. Note 1: Bit 21 of TBLPT RU allows access to the device configuration bits.

— —bit 21

OSCFIE CMIE — EEIE BCL1IE HLVDIE TMR3IE CCP2IE 60

(1)

Program Memory T able Pointer Upper Byte (TBLPTR<20:16>) 57

— FREE WRERR WREN WR RD 59

Values on

page

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NOTES:

DS39646B-page 96 Preliminary  2004 Microchip Technology Inc.

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7.0 EXTERNAL MEMORY BUS

Note: The external memory bus is not imple-

mented on PIC18F6527/6622/6627/6722 (64-pin) devices.

The External Memory Bus allows the device to access external memory devices (such as Flash, EPROM, SRAM, etc.) as program or data memory. It supports both 8-bit and 16-bit Data Width modes and four address widths from 8 to 20 bits.

The bus is implemented with 28 pins, multiplexed across four I/O ports. Three ports (PORTD, PORTE and PORTH) are m ultiplexed with th e address/dat a bus for a total of 20 available lines, while PORTJ is multiplexed with the bus cont rol signals.

A list of the pins and their functions is provided in Table 7-1.

T ABLE 7-1: PIC18F8527/8622/8627/8722 EXTERNAL BUS – I/O PORT FUNCTIONS

Name Port Bit External Memory Bus Function

RD0/AD0 PORTD 0 Address bit 0 or Data bit 0 RD1/AD1 PORTD 1 Address bit 1 or Data bit 1 RD2/AD2 PORTD 2 Address bit 2 or Data bit 2 RD3/AD3 PORTD 3 Address bit 3 or Data bit 3 RD4/AD4 PORTD 4 Address bit 4 or Data bit 4 RD5/AD5 PORTD 5 Address bit 5 or Data bit 5 RD6/AD6 PORTD 6 Address bit 6 or Data bit 6 RD7/AD7 PORTD 7 Address bit 7 or Data bit 7 RE0/AD8 PORTE 0 Address bit 8 or Data bit 8

RE1/AD9 PORTE 1 Address bit 9 or Data bit 9 RE2/AD10 PORTE 2 Address bit 10 or Data bit 10 RE3/AD11 PORTE 3 Address bit 11 or Data bit 11 RE4/AD12 PORTE 4 Address bit 12 or Data bit 12 RE5/AD13 PORTE 5 Address bit 13 or Data bit 13 RE6/AD14 PORTE 6 Address bit 14 or Data bit 14 RE7/AD15 PORTE 7 Address bit 15 or Data bit 15

RH0/A16 PORTH 0 Address bi t 16 RH1/A17 PORTH 1 Address bi t 17 RH2/A18 PORTH 2 Address bi t 18 RH3/A19 PORTH 3 Address bi t 19 RJ0/ALE PORTJ 0 Address Latch Enable (ALE) Control pin

RJ1/OE

RJ2/WRL

RJ3/WRH

RJ4/BA0 PORTJ 4 Byte Address bit 0 (BA0)

RJ5/CE

RJ6/LB

RJ7/UB

Note: For the sake of clarity, only I/O port and external bus ass ignme nts are show n he re. O ne or more additi onal

multiplexed features may be available on some pins.

PORTJ 1 Output Enable (OE) Control pin PORTJ 2 Write Low (WRL) Control pin PORTJ 3 Write High (WRH) Control pin

PORTJ 5 Chip Enable (CE) Control pin PORTJ 6 Lower Byte Enable (LB) Control pin PORTJ 7 Upper Byte Enable (UB) Control pin

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7.1 External Memory Bus Control

The operation of the interface is controlled by the MEMCON register (Register 7-1). This register is available in all program memory operating modes except Microcontrol le r mode. In this mode, the register is disabled and cannot be written to.

The EBDIS bit (MEMCON<7>) controls the operation of the bus and related port functions. Clearing EBDIS enables the interface and disables the I/O functions of the ports, as well as any other functions multiplexed to those pins. Setting the bit enables the I/O ports and other functions but allows the interface to override everything else on the pins when an external memory operation i s required. By def ault, the external bus is always enabled and disables all other I/O.

The operation of the EBDIS bit is also influenc ed by the program memory mode being used. This is discussed in more detail in Section 7.4 “Program Memory Modes and the External Memory Bus”.

The WAIT bits allow for the addition of wait states to external memory operations. The use of these bits is discussed in Section 7.3 “Wait States”.

The WM bits select th e p artic ular ope rating m ode use d when the bu s is op eratin g in 16 -bit D ata Width mode. These are discussed in more detail in Section 7.5 “16-bit Data W id th M odes”. The se bit s h ave no ef fect when an 8-bit Data Width mode is selected.

REGISTER 7-1: MEMCON: EXTERNAL MEMORY BUS CONTROL REGISTER

R/W-0 U-0 R/W-0 R/W-0 U-0 U-0 R/W-0 R/W-0

EBDIS

bit7 bit0

bit 7 EBDIS: External Bus Disable bit

1 = External bus enabled when microcontroller accesses external memory;

otherwise, all external bus drivers are mapped as I/O ports

0 = External bus always enabled, I/O ports are disabled bit 6 Unimplemented: Read as ‘0’ bit 5-4 WAIT1:WAIT0: Table Reads and Writes Bus Cycle Wait Count bits

11 = Table reads and writes will wait 0 TCY

10 = Table reads and writes will wait 1 TCY

01 = Table reads and writes will wait 2 TCY

00 = Table reads and writes will wait 3 TCY

bit 3-2 Unimplemented: Read as ‘0’ bit 1-0 WM1:WM0: TBLWT Operation with 16-bit Data Bus Width Select bits

1x = Word Write mode: TABLAT0 and TABLAT1 word output, WRH active when

TABLAT1 written

01 = Byte Select mode: TABLAT data copied on both MSB and LSB, WRH and (UB or LB)

will activate

00 = Byte Write mode: TABLAT data copied on both MSB and LSB, WRH or W RL will activate

—WAIT1WAIT0— —WM1WM0

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

DS39646B-page 98 Preliminary  2004 Microchip Technology Inc.

MICROCHIP PIC18F8722 DATA SHEET

Specifications and Main Features

Frequently Asked Questions

User Manual

Peripheral Highlights:

External Memory Interface (PIC18F8527/8622/8627/8722 only):

Power-Managed Modes:

Special Microcontroller Features:

Pin Diagrams

Table of Contents

1.0 DEVICE OVERVIEW

1.1 New Core Features

1.1.1 nanoWatt TECHNOLOGY

1.1.2 EXPANDED MEMORY

1.1.4 EXTERNAL MEMORY INTERFACE

1.1.5 EASY MIGRATION

1.2 Other Special Features

1.3 Details on Individual Family Members

T ABLE 1-1: DEVICE FEATURES (PIC18F6527/6622/6627/6722)

TABLE 1-2: DEVICE FEATURES (PIC18F8527/8622/8627/8722)

FIGURE 1-1: PIC18F6527/6622/6627/6722 (64-PIN) BLOCK DIAGRAM

FIGURE 1-2: PIC18F8527/8622/8627/8722 (80-PI N) BLOC K DIAGRAM

2.0 OSCILLATOR CONFIGURATIONS

2.1 Oscillator Types

2.2 Crystal Oscilla tor/Ceramic Resonators

2.3 External Clock Input

2.4 RC Oscillator

FIGURE 2-5: RC OSCILLATOR MODE

FIGURE 2-6: RCIO OSCILLATOR MODE

2.5 PLL Frequency Multiplier

2.5.1 HSPLL OSCILLATOR MODE

FIGURE 2-7: HSPLL BLOCK DIAGRAM

2.5.2 PLL AND INTOSC

2.6 Internal Oscillator Block

2.6.1 INTIO MODES

FIGURE 2-8: INTIO1 OSCILLATOR MODE

2.6.2 INTOSC OUTPUT FREQUENCY

2.6.3 OSCTUNE REGISTER

FIGURE 2-9: INTIO2 OSCILLATOR MODE

2.6.4 PLL IN INTOSC MODES

2.6.5 INTOSC FREQUENCY DRIFT

REGISTER 2-1: OSCTUNE: OSCILLATOR TUNING REGISTER

2.7 Clock Sources and Oscillator Switching

FIGURE 2-11: PIC18F8722 FAMILY CLOCK DIAGRAM

2.7.1 OSCILLATOR CONTROL REGISTER

2.7.2 OSCILLATOR TRANSITIONS

REGISTER 2-2: OSCCON: OSCILLATOR CONTROL REGISTER

2.8 Effects of Power-Managed Modes on the Various Clock Sources

2.9 Power-up Delays

TABLE 2-3: OSC1 AND OSC2 PIN STATES IN SLEEP MODE

3.0 POWER-MANAGED MODES

3.1 Selecting Power-Managed Modes

3.1.1 CLOCK SOURCES

TABLE 3-1: POWER-MANAGED MODES

3.1.3 CLOCK TRANSITI ONS AND S TATUS INDICATORS

3.1.4 MULTIPLE SLEEP COMMANDS

3.2 Run Modes

3.2.1 PRI_RUN MODE

3.2.2 SEC_RUN MODE

FIGURE 3-1: TRANSITION TIMING FOR ENTRY TO SEC_RUN MODE

FIGURE 3-2: TRANSITION TIMING FROM SEC_RUN MODE TO PRI_RUN MODE (HSPLL)

3.2.3 RC_RUN MODE

FIGURE 3-3: TRANSITION TIMING TO RC_RUN MODE

FIGURE 3-4: TRANSITION TIMING FROM RC_RUN MODE TO PRI_RUN MODE

3.3 Sleep Mode

3.4 Idle Modes

FIGURE 3-5: TRANSITION TIMING FOR ENTRY TO SLEEP MODE

FIGURE 3-6: TRANSITION TIMING FOR WAKE FROM SLEEP (HSPLL)

3.4.1 PRI_IDLE MODE

3.4.2 SEC_IDLE MODE

FIGURE 3-7: TRANSITION TIMING FOR ENTRY TO IDLE MODE

FIGURE 3-8: TRANSITION TIMING FOR WAKE FROM IDLE TO RUN MODE

3.4.3 RC_IDLE MODE

3.5 Exiting Idle and Sleep Modes

3.5.1 EXIT BY INTERRUPT

3.5.2 EXIT BY WDT TIME-OUT

3.5.3 EXIT BY RESET

3.5.4 EXIT WITHOUT AN OSCILLATOR START-UP DELAY

4.0 RESET

4.1 RCON Register