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 intended through suggestion only
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
No representation or warranty is given and no liability is
assumed by Microchip Technology Incorporated with respect
to the accuracy or use of such information, or infringement of
patents or other intellectual property rights arising from such
use or otherwise. Use of Microchip’s products 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 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, 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
Programming, ICSP, ICEPIC, Migratable Memory, MPASM,
MPLIB, MPLINK, MPSIM, PICkit, PICDEM, PICDEM.net,
PICLAB, PICtail, PowerCal, PowerInfo, PowerMate,
PowerTool, rfLAB, rfPICDEM, Select Mode, Smart Serial,
SmartTel 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.
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
DS39635A-page iiPreliminary 2004 Microchip Technology Inc.
PIC18F6310/6410/8310/8410
64/80-Pin Flash Microcontrollers with nanoWatt Technology
Power Managed Modes:
• Run: CPU on, peripheral s on
• Idle: CPU off, peripheral s on
• Sleep: CPU off, peripherals off
• Idle mode currents down to 5.8 µA typical
• Sleep mode currents down to 0.1 µA typical
• Timer1 Oscillator: 1.8 µA, 32 kHz, 2V
• Watchdog Timer: 2.1 µA
• T wo -Spe ed Os ci ll ator Start-up
Flexible Oscillator Struc ture:
• Four Crystal modes:
- LP: up to 200 kHz
- XT: up to 4 MHz
- HS: up to 40 MHz
- HSPLL: 4-10 MHz (16-40 MHz internal)
• 4x Phase Lock Loop (available for crystal and
internal oscillators)
• Two External RC modes, up to 4 MHz
• Two External Clock modes, up to 40 MHz
• Internal oscillator block:
- 8 user selectable frequencies, from 31 kHz to 8 MHz
- Provides a complete range of clock speeds
from 31 kHz to 32 MHz when used with PLL
- User-tunable to compensate for frequency drift
• Secondary oscillator using Timer1 @ 32 kHz
• Fail-Safe Clock Monitor:
- Allows for safe shut down of dev ice if prim ary
or secondary clock fails
16.0 Master Synchronous Serial Port (MSSP) Module .................................................................................................................... 169
23.0 Special Features of the CPU.............. ................ ................. ................. ................. ............... .................................................... 271
24.0 Instruction Set Summary.......................................................................................................................................................... 287
25.0 Development Support............................................................................................................................................................... 337
27.0 DC and AC Characteristics Graphs and Tables....................................................................................................................... 379
Appendix D: Migration from Baseline to Enhanced Devices..............................................................................................................386
Appendix E: Migration from Mid-Range to Enhanced Devices ..........................................................................................................387
Appendix F: Migration from High-End to Enhanced Devices.............................................................................................................387
Index .................................................................................................................................................................................................. 389
Systems Information and Upgrade Hot Line......................................................................................................................................399
PIC18F6310/6410/8310/8410 Product Identification System ............................................................................................................401
DS39635A-page 4Preliminary 2004 Microchip Technology Inc.
PIC18F6310/6410/8310/8410
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@mail.microchip.com or fax the Reader Response Form in the back of this data sheet to (480) 792-4150.
We welcome your feedback.
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To obtain the most up-to-date version of this data sheet, please register at our Worldwide Web site at:
http://www.microchip.com
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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
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To determine if an errata sheet exists for a particular device, please check with one of the following:
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DS39635A-page 6Preliminary 2004 Microchip Technology Inc.
PIC18F6310/6410/8310/8410
1.0DEVICE 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:
• PIC18F6310• PIC18LF6310
• PIC18F6410• PIC18LF6410
• PIC18F8310• PIC18LF8310
• PIC18F8410• PIC18LF8410
This family offers the advantages of all PIC18
microcontrollers – namely, high computational
performance at an economical price. In addition to
these features, the PIC18F6310/6410/8310/8410
family introduces design enhancements that make
these microcontrollers a logical choice for many
high-performance, power sensitive applications.
1.1New Core Features
1.1.1nanoWatt TECHNOLOGY
All of the devices in the PIC18F6310/6410/8310/8410
family incorporate 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 reduced by as much as 90%.
• Multiple Idle Modes: The controller can also run
with its CPU core disabled, bu t the peripheral s still
active. In these st ates, powe r consumpt ion can be
reduced even further – t o as litt le as 4% of nor mal
operation requirements.
• On-the-Fly Mode Switching: The power
managed modes a re invo ked b y user code durin g
operation, allowing the user to incorporate
power-saving ideas into their application’s
software design.
• Lower Consumption in Key Modules: The
power requirements for both Timer1 and the
Watchdog Timer have been reduced by up to
80%, with typical values of 1.1 µA and 2.1 µA,
respectively.
1.1.2MULTIPLE OSCILLATOR OPTIONS
AND FEATURES
All of the devices in the PIC18F6310/6410/8310/8410
family offer nine different oscillator options, allowing
users a wide range o f choices i n develo ping applica tion
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 (±2% accuracy) and an INTRC
source (approximately 31kHz, stable over
temperature and V
user selectable cl oc k frequ enc ie s betw ee n
125 kHz to 4 MHz for a total of eight 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
Internal Oscillator modes, which allows clock
speeds of up to 40MHz. Used with the internal
oscillator, the PLL gives users a complete
selection of clock speeds from 31 kHz to 32 MHz
– all without using an external crystal or clock
circuit.
Besides its ava ilability as a cloc k source, the intern al
oscillator block pro vid es a s t ab le re fere nce source that
gives the family additional features for robust
operation:
• Fail-Safe Clock Monitor: This option constantly
monitors the main clock source against a
reference signal provided by the internal
oscillator. If a clock failure occurs, the controller i s
switched to the 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.
• Memory Endurance: The Flas h cells f or prog ram
memory are rated to last for approximately a
thousand erase/write cycles. Data retention
without refresh is conservatively estimated to be
greater than 100 years.
• External Memory Interface: For those
applications where mo re p r ogra m o r data storage
is needed, the PIC18F 8310/8 410 dev ices provid e
the ability to access external memory devices.
The memory interface is configurable for both
8-bit and 16-bit data widths and uses a standard
range of control signals to enable communication
with a wide range of memory devices. With their
21-bit program counters, the 80-pin dev ic es can
access a linear memory space of up to 2 Mbytes.
• Extended Instruction Set: The
PIC18F6310/6410/8310/8410 family introduces
an optional extension to th e PIC18 instr uction set,
which adds 8 new instructions and an Indexed
Addressing mode. This extension, enabled as a
device configuration option, has been specifically
designed to optimize re-entrant application code
originally developed in high-level languages such
as ‘C’.
• Enhanced Addressable USART: This serial
communication module is capable of standard
RS-232 operation an d provides support for th e LIN
bus protocol. Other enhancements include
Automatic Baud Rate Detec tion an d a 16-bit Baud
Rate Generator for improved resolu tion. When the
microcontroller is using the internal oscillator
block, the EUSART provides stable operation for
applications that talk to the outside world, without
using an external crystal (or its accompanying
power requirement).
• 10-bit A/D Converter: This module incorporates
programmable acquisition time, allowing for a
channel to be selected and a conversion to be
initiated withou t wai ting for a sampling period and
thus, reduces code overhead.
• Extended Watchdog Timer (WDT): This
enhanced version in corpora tes a 1 6-bit pre scale r,
allowing a time-out range from 4 ms to over
2 minutes that is stable across operating voltage
and temperature.
1.3Details on Individual Family
Members
Devices in the PIC18F 6310/6410 /8310/8410 famil y are
available in 64-pin (PIC18F6310/8310) and 80-pin
(PIC18F6410/8410) packages. Block diagrams for the
two groups are shown in Figure 1-1 and Figure 1-2,
respectively.
The devices are differentiated from each other in three
ways:
1.Flash Program Me mory: 8 Kbytes in PIC1 8FX310
devices, 16 Kbytes in PIC18FX410 devices.
2.I/O Ports: 7 bidirectional ports on 64-pin
devices, 9 bidirectional ports on 80-pin devices.
3.External Memory Interface: present on 80-pin
devices only.
All other features fo r device s in this family are identi cal.
These are summarized in Table 1-1.
The pinouts for all devices are listed in Table 1-2 and
Table 1-3.
Like all Microchip PIC18 devices, members of the
PIC18F6310/6410/8310/8410 family are available as
both standard and low-voltage devices. Standard
devices with Flash memory, designated with an “F” in
the part number (such a s PIC18F63 10), acc ommoda te
an operating V
parts, designated by “LF” (such as PIC18LF6410),
function over an extended V
DD range of 4.2V to 5.5V. Low-voltage
DD range of 2.0V to 5.5V.
DS39635A-page 8Preliminary 2004 Microchip Technology Inc.
PIC18F6310/6410/8310/8410
TABLE 1-1:DEVICE FEATURES
FeaturesPIC18F6310PIC18F6410PIC18F8310PIC18F8410
Operating FrequencyDC – 40 MHzDC – 40 MHzDC – 40 MHzDC – 40 MHz
Program Memory (Bytes)8K16K8K16K
Program Memory (Instruction s)4096819240968192
Data Memory (Bytes)768768768768
External Memory InterfaceNoNoYesYes
Interrupt Sources22222222
I/O PortsPorts A, B, C, D, E,
F, G
Timers4444
Capture/Compare/PWM Modules3333
Serial CommunicationsMSSP, AUSART
Note 1: CCP2 multiplexing is determined by the settings of the CCP2MX and PM1:PM0 configuration bits.
2: RG5 is only available when MCLR
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.
ST = Schmitt Trigger input with CMOS levels Analog = Analog input
I= Input O= Output
P= Power OD= Open-Drain (no P diode to V
Note 1: Default assignment for CCP2 when configuration bit CCP2MX is set.
2: Alternate assignment for CCP2 when configuration bit CCP2MX is cleared.
39
40
7
I
I
P
I
I
CMOS
I/O
O
O
I/O
Master Clear (input) or programming voltage (input).
ST
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 input. Always associated
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.
DD)
DS39635A-page 12Preliminary 2004 Microchip Technology Inc.
PIC18F6310/6410/8310/8410
T ABLE 1-2:PIC18F6310/6410 PINOUT I/O DESCRIPTIONS (CONTINUED)
Pin Name
Pin Number
TQFP
Pin
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
RA6See the OSC2/CLKO/RA6 pin.
RA7See the OSC1/CLKI/RA7 pin.
ST = Schmitt Trigger input with CMOS levels Analog = Analog input
I= Input O= Output
P= Power OD= Open-Drain (no P diode to V
Note 1: Alternate assignment for CCP2 when configuration bit CCP2MX is cleared (all operating modes except
Microcontroller mode).
2: Default assignment for CCP2 in all operating modes (CCP2MX is set).
3: Alternate assignment for CCP2 when CCP2MX is cleared (Microcontroller mode only).
49
50
9
I
I
P
I
I
CMOS
I/O
O
O
I/O
Master Clear (input) or programming voltage (input).
ST
ST
ST
TTL
—
—
TTL
Digital input.
Master Clear (Reset) input. This pin is an active-low
Reset to the device.
Programming voltage inp ut.
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 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.
DD)
DS39635A-page 20Preliminary 2004 Microchip Technology Inc.
PIC18F6310/6410/8310/8410
T ABLE 1-3:PIC18F8310/8410 PINOUT I/O DESCRIPTIONS (CONTINUED)
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
RA6See the OSC2/CLKO/RA6 pin.
RA7See the OSC1/CLKI/RA7 pin.
REF-
REF-
REF+
REF+
30
29
28
27
34
33
I/O
I/O
I/O
I/O
I/OIST/ODSTDigital I/O. Open-drain when configured as output.
I/O
TTL
I
Analog
TTL
I
Analog
TTL
I
Analog
I
Analog
TTL
I
Analog
I
Analog
TTL
I
Analog
I
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.
ST = Schmitt Trigger input with CMOS levels Analog = Analog input
I= Input O= Output
P= Power OD= Open-Drain (no P diode to V
Note 1: Alternate assignment for CCP2 when configuration bit CCP2MX is cleared (all operating modes except
Microcontroller mode).
2: Default assignment for CCP2 in all operating modes (CCP2MX is set).
3: Alternate assignment for CCP2 when CCP2MX is cleared (Microcontroller mode only).
54
53
52
47
I/O
I/O
I/O
I/O
I/O
I/O
TTL
I
TTL
TTL
I
TTL
TTL
I
TTL
ST
TTL
I
TTL
ST
Digital I/O.
Interrupt-on-change pin.
Digital I/O.
Interrupt-on-change pin.
Digital I/O.
Interrupt-on-change pin.
In-Circuit Debugger and ICSP™ program mi ng clo ck pin.
Digital I/O.
Interrupt-on-change pin.
In-Circuit Debugger and ICSP programming data pin.
DD)
DS39635A-page 22Preliminary 2004 Microchip Technology Inc.
PIC18F6310/6410/8310/8410
T ABLE 1-3:PIC18F8310/8410 PINOUT I/O DESCRIPTIONS (CONTINUED)
ST = Schmitt Trigger input with CMOS levels Analog = Analog input
I= Input O= Output
P= Power OD= Open-Drain (no P diode to V
Note 1: Alternate assignment for CCP2 when configuration bit CCP2MX is cleared (all operating modes except
Microcontroller mode).
2: Default assignment for CCP2 in all operating modes (CCP2MX is set).
3: Alternate assignment for CCP2 when CCP2MX is cleared (Microcontroller mode only).
36
35
43
44
45
46
37
38
I/O
O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
O
I/O
O
I/O
I/O
I/O
ST
—
I
I
I
I
ST
ST
CMOS
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
—
ST
—
ST
ST
ST
ST
Digital I/O.
Timer1 oscillator output.
Timer1/Timer3 external clock input.
ST = Schmitt Trigger input with CMOS levels Analog = Analog input
I= Input O= Output
P= Power OD= Open-Drain (no P diode to V
Note 1: Alternate assignment for CCP2 when configuration bit CCP2MX is cleared (all operating modes except
Microcontroller mode).
2: Default assignment for CCP2 in all operating modes (CCP2MX is set).
3: Alternate assignment for CCP2 when CCP2MX is cleared (Microcontroller mode only).
64
63
I/O
I/O
I/O
I/O
I/O
I/O
ST
TTL
TTL
ST
TTL
TTL
Digital I/O.
External memory address/data 6.
Parallel Slave Port data.
Digital I/O.
External memory address/data 7.
Parallel Slave Port data.
DD)
DS39635A-page 24Preliminary 2004 Microchip Technology Inc.
PIC18F6310/6410/8310/8410
T ABLE 1-3:PIC18F8310/8410 PINOUT I/O DESCRIPTIONS (CONTINUED)
Pin Name
Pin Number
TQFP
Pin
Type
Buffer
Type
Description
PORTE is a bidirectional I/O port.
RE0/AD8/RD
RE0
AD8
RD
RE1/AD9/WR
RE1
AD9
WR
RE2/AD10/CS
RE2
AD10
CS
RE3/AD11
RE3
AD11
RE4/AD12
RE4
AD12
RE5/AD13
RE5
AD13
RE6/AD14
RE6
AD14
78
77
76
75
74
4
I/O
I/O
I
3
I/O
I/O
I
I/O
I/O
I
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
ST
TTL
TTL
ST
TTL
TTL
ST
TTL
TTL
ST
TTL
ST
TTL
ST
TTL
ST
TTL
Digital I/O.
External memory address/data 8.
Read control for Parallel Slave Port.
Digital I/O.
External memory address/data 9.
Write control for Parallel Slave Port.
Digital I/O.
External memory address/data 10.
Chip Select control for Parallel Slave Port.
ST = Schmitt Trigger input with CMOS levels Analog = Analog input
I= Input O= Output
P= Power OD= Open-Drain (no P diode to V
Note 1: Alternate assignment for CCP2 when configuration bit CCP2MX is cleared (all operating modes except
Microcontroller mode).
2: Default assignment for CCP2 in all operating modes (CCP2MX is set).
3: Alternate assignment for CCP2 when CCP2MX is cleared (Microcontroller mode only).
ST = Schmitt Trigger input with CMOS levels Analog = Analog input
I= Input O= Output
P= Power OD= Open-Drain (no P diode to V
Note 1: Alternate assignment for CCP2 when configuration bit CCP2MX is cleared (all operating modes except
Microcontroller mode).
2: Default assignment for CCP2 in all operating modes (CCP2MX is set).
3: Alternate assignment for CCP2 when CCP2MX is cleared (Microcontroller mode only).
13
I/O
ST
I
TTL
Digital I/O.
SPI slave select input.
DD)
DS39635A-page 26Preliminary 2004 Microchip Technology Inc.
PIC18F6310/6410/8310/8410
T ABLE 1-3:PIC18F8310/8410 PINOUT I/O DESCRIPTIONS (CONTINUED)
ST = Schmitt Trigger input with CMOS levels Analog = Analog input
I= Input O= Output
P= Power OD= Open-Drain (no P diode to V
Note 1: Alternate assignment for CCP2 when configuration bit CCP2MX is cleared (all operating modes except
Microcontroller mode).
2: Default assignment for CCP2 in all operating modes (CCP2MX is set).
3: Alternate assignment for CCP2 when CCP2MX is cleared (Microcontroller mode only).
VSS11, 31, 51, 70P—Ground reference for logic and I/O pins.
DD12, 32, 48, 71P—Positive supply for logic and I/O pins.
V
AVSS26P—Ground reference for analog modules.
AVDD25P—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 OD= Open-Drain (no P diode to V
Note 1: Alternate assignment for CCP2 when configuration bit CCP2MX is cleared (all operating modes except
Microcontroller mode).
2: Default assignment for CCP2 in all operating modes (CCP2MX is set).
3: Alternate assignment for CCP2 when CCP2MX is cleared (Microcontroller mode only).
62
61
60
59
39
40
41
42
I/O
O
I/O
O
I/O
O
I/O
O
I/O
O
I/O
O
I/O
O
I/O
O
ST
—
ST
—
ST
—
ST
—
ST
—
ST
—
ST
—
ST
—
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.
DD)
DS39635A-page 28Preliminary 2004 Microchip Technology Inc.
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