Datasheet PIC16LF1503, PIC16F1503 Datasheet

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PIC16(L)F1503

14-Pin Flash, 8-Bit Microcontrollers

High-Performance RISC CPU:

• C Compiler Optimized Architecture

• Only 49 Instructions

• 2 Kwords Linear Program Memory Addressing

• 128 bytes Linear Data Memory Addressing

• Operating Speed:

- DC – 20 MHz clock input

- DC – 200 ns instruction cycle

• Interrupt Capability with Automatic Context Saving

• 16-Level Deep Hardware Stack with Optional Overflow/Underflow Reset

• Direct, Indirect and Relative Addressing modes:

- Two full 16-bit File Select Registers (FSRs)

- FSRs can read program and data memory

Flexible Oscillator Structure:

• 16 MHz Internal Oscillator Block:

- Factory calibrated to ±1%, typical

- Software selectable frequency range from

16 MHz to 31 kHz

• 31 kHz Low-Power Internal Oscillator

• Three External Clock modes up to 20 MHz

Special Microcontroller Features:

• Operating Voltage Range:

- 1.8V to 3.6V (PIC16LF1503)

- 2.3V to 5.5V (PIC16F1503)

• Self-Programmable under Software Control

• Power-On Reset (POR)

• Power-up Timer (PWRT)

• Programmable Low-Power Brown-Out Reset (LPBOR)

• Extended Watchdog Timer (WDT):

- Programmable period from 1 ms to 256s

• Programmable Code Protection

• In-Circuit Serial Programming™ (ICSP™) via Two Pins

• Enhanced Low-Voltage Programming (LVP)

• In-Circuit Debug (ICD) via Two Pins

• Power-Saving Sleep mode:

- Low-Power Sleep mode

- Low-Power BOR (LPBOR)

• Integrated Temperature Indicator

• 128 Bytes High-Endurance Flash

- 100,000 write Flash endurance (minimum)

Low-Power Features (PIC16LF1503):

• Standby Current:

- 20 nA @ 1.8V, typical

• Watchdog Timer Current:

- 260 nA @ 1.8V, typical

• Operating Current:

-30 A/MHz @ 1.8V, typical

Peripheral Features:

• Analog-to-Digital Converter (ADC):

- 10-bit resolution

- Eight external channels

- Three internal channels:

- Fixed Voltage Reference

- Digital-to-Analog Converter (DAC)

- Temperature Indicator channel

- Auto acquisition capability

- Conversion available during Sleep

• 5-Bit Digital-to-Analog Converter (DAC):

- Output available externally

- Positive reference selection

- Internal connections to comparators and ADC

• Two Comparators:

- Rail-to-rail inputs

- Power mode control

- Software controllable hysteresis

• Voltage Reference:

- 1.024V Fixed Voltage Reference (FVR) with 1x, 2x and 4x Gain output levels

• 12 I/O Pins (1 Input-only Pin):

- High current sink/source 25 mA/25 mA

- Individually programmable weak pull-ups

- Individually programmable Interrupt-On-Change (IOC) pins

• Timer0: 8-Bit Timer/Counter with 8-Bit Programmable Prescaler

• Enhanced Timer1:

- 16-bit timer/counter with prescaler

- External Gate Input mode

• Timer2: 8-Bit Timer/Counter with 8-Bit Period Register, Prescaler and Postscaler

• Four 10-bit PWM modules

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PIC16(L)F1503

Peripheral Features (Continued):

• Master Synchronous Serial Port (MSSP) with SPI

and I

C™ with:

- 7-bit address masking

- SMBus/PMBus™ compatibility

• Two Configurable Logic Cell (CLC) modules:

- 16 selectable input source signals

- Four inputs per module

- Software control of combinational/sequential logic/state/clock functions

- AND/OR/XOR/D Flop/D Latch/SR/JK

- Inputs from external and internal sources

- Output available to pins and peripherals

- Operation while in Sleep

• Numerically Controlled Oscillator (NCO):

- 20-bit accumulator

- 16-bit increment

- True linear frequency control

- High-speed clock input

- Selectable Output modes

- Fixed Duty Cycle (FDC) mode

- Pulse Frequency (PF) mode

• Complementary Waveform Generator (CWG):

- Eight selectable signal sources

- Selectable falling and rising edge dead-band control

- Polarity control

- Four auto-shutdown sources

- Multiple input sources: PWM, CLC, NCO

PIC12(L)F1501/PIC16(L)F150X FAMILY TYPES

(1)

NCO

Debug

Data SRAM

(2)

I/O’s

(bytes)

10-bit ADC (ch)

DAC

Timers

Comparators

PWM

(8/16-bit)

Device

Data Sheet Index

PIC12(L)F1501 (1) 1024 64 6 4 1 1 2/1 4 — — 1 2 1 H — PIC16(L)F1503 (2) 2048 128 12 8 2 1 2/1 4 — 1 1 2 1 H — PIC16(L)F1507 (3) 2048 128 18 12 — — 2/1 4 — — 1 2 1 H — PIC16(L)F1508 (4) 4096 256 18 12 2 1 2/1 4 1 1 1 4 1 I/H Y PIC16(L)F1509 (4) 8192 512 18 12 2 1 2/1 4 1 1 1 4 1 I/H Y

Note 1: Debugging Methods: (I) - Integrated on Chip; (H) - using Debug Header; (E) - using Emulation Header.

2: One pin is input-only.

Data Sheet Index: (Unshaded devices are described in this document.)

1: DS00041615 PIC12(L)F1501 Data Sheet, 8-Pin Flash, 8-bit Microcontrollers. 2: DS00041607 3: DS00041586 PIC16(L)F1507 Data Sheet, 20-Pin Flash, 8-bit Microcontrollers. 4: DS00041609 PIC16(L)F1508/9 Data Sheet, 20-Pin Flash, 8-bit Microcontrollers.

Flash (words)

Program Memory

PIC16(L)F1503 Data Sheet, 14-Pin Flash, 8-bit Microcontrollers.

C™/SPI)

EUSART

MSSP (I

CLC

CWG

XLP

Note: For other small form-factor package availability and marking information, please visit

http://www.microchip.com/packaging or contact your local sales office.

DS40001607C-page 2  2011-2014 Microchip Technology Inc.

PIN DIAGRAMS

PIC16(L)F1503

2 3 4

14 13

5 6

VDD RA5 RA4

MCLR

/VPP/RA3

RC5

RC4

RC3

RA0/ICSPDAT

RA1/ICSPCLK RA2

RC0

RC1 RC2

Note: See Ta bl e 1 for location of all peripheral functions.

Note 1: See Tab le 1 for location of all peripheral functions.

2: It is recommended that the exposed bottom pad be connected to V

SS.

2 3

13141516

RA5 RA4

MCLR/VPP/RA3

RC4

RC3

RC1

RC2

RC0

RA0/ICSPDAT

RA2

RA1/ICSPCLK

Vss

VDD

RC5

PIC16(L)F1503

Pin Diagram – 14-Pin PDIP, SOIC, TSSOP

Pin Diagram – 16-PIN QFN, UQFN

PIC16(L)F1503

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PIC16(L)F1503

PIN ALLOCATION TABLE

TABLE 1: 14-PIN ALLOCATION TABLE (PIC16(L)F1503)

I/O

14-Pin PDIP/SOIC/TSSOP

RA0 13 12 AN0 DACOUT1 C1IN+ — — — — — — IOC

RA1 12 11 AN1 VREF+ C1IN0-

RA2 11 10 AN2 DACOUT2 C1OUT T0CKI CWG1FLT — CLC1 PWM3 — INT

RA3 4 3 — — — T1G

RA4 3 2 AN3 — — T1G — NCO1

RA5 2 1 — — — T1CKI — NCO1CLK CLC1IN1 — — IOC

RC0 10 9 AN4 — C2IN+ — — — CLC2 — SCL

RC1 9 8 AN5 — C1IN1-

RC2 8 7 AN6 — C1IN2-

RC3 7 6 AN7 — C1IN3-

RC4 6 5 — — C2OUT — CWG1B — CLC2IN1 — — — — —

RC5 5 4 — — — — CWG1A — CLC1

VDD 1 16 — — — — — — — — — — — VDD

VSS 14 13 — — — — — — — — — — — VSS

Note 1: Alternate pin function selected with the APFCON (Register 11-1) register.

ADC

16-Pin QFN, UQFN

Reference

Comparator

C2IN0-

C2IN1-

C2IN2-

C2IN3-

Timer

— — — — — — IOC

(1)

— — NCO1 — PWM4 SDA

— — — — — SDO — — —

— — — CLC2IN0 PWM2 SS — — —

CWG

— — CLC1IN0 — SS

NCO

(1)

CLC

— — SDO

(1)

PWM

SCK

SDI

PWM1 — — — —

MSSP

IOC

(1)

IOC

(1)

IOC

— — —

Pull-Up

Interrupt

ICSPDAT

ICSPCLK

MCLR

VPP

CLKOUT

CLKIN

Basic

—

DS40001607C-page 4  2011-2014 Microchip Technology Inc.

PIC16(L)F1503

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

Enhanced Mid-Range CPU................................................................................................................................................................. 11

Memory Organization.......................................................................................................................................................................... 13

Device Configuration ........................................................................................................................................................................... 37

Oscillator Module ................................................................................................................................................................................ 42

Resets ................................................................................................................................................................................................. 51

Interrupts ............................................................................................................................................................................................. 59

Power-Down Mode (Sleep) ................................................................................................................................................................. 72

Watchdog Timer (WDT) ...................................................................................................................................................................... 75

Flash Program Memory Control .......................................................................................................................................................... 79

I/O Ports .............................................................................................................................................................................................. 95

Interrupt-On-Change ......................................................................................................................................................................... 104

Fixed Voltage Reference (FVR) ........................................................................................................................................................ 108

Temperature Indicator Module .......................................................................................................................................................... 111

Analog-to-Digital Converter (ADC) Module ....................................................................................................................................... 113

5-Bit Digital-to-Analog Converter (DAC) Module ............................................................................................................................... 127

Comparator Module .......................................................................................................................................................................... 130

Timer0 Module .................................................................................................................................................................................. 137

Timer1 Module with Gate Control ..................................................................................................................................................... 140

Timer2 Module .................................................................................................................................................................................. 151

Master Synchronous Serial Port (MSSP) Module ............................................................................................................................. 154

Pulse Width Modulation (PWM) Module ........................................................................................................................................... 209

Configurable Logic Cell (CLC) .......................................................................................................................................................... 215

Numerically Controlled Oscillator (NCO) Module .............................................................................................................................. 231

Complementary Waveform Generator (CWG) Module ..................................................................................................................... 238

In-Circuit Serial Programming™ (ICSP™) ........................................................................................................................................ 251

Instruction Set Summary ................................................................................................................................................................... 253

Electrical Specifications .................................................................................................................................................................... 267

DC and AC Characteristics Graphs and Charts ................................................................................................................................ 297

Development Support ....................................................................................................................................................................... 332

Packaging Information ...................................................................................................................................................................... 336

Appendix A: Data Sheet Revision History......................................................................................................................................... 351

The Microchip Web Site .................................................................................................................................................................... 352

Customer Change Notification Service 3 ........................................................................................................................................... 352

Customer Support ............................................................................................................................................................................. 352

Product Identification System ........................................................................................................................................................... 353

 2011-2014 Microchip Technology Inc. DS40001607C-page 5

PIC16(L)F1503

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 comments regarding this publication, please contact the Marketing Communications 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

To obtain the most up-to-date version of this data sheet, please register at our Worldwide Web site at:

http://www.microchip.com

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:

• Microchip’s Worldwide Web site; http://www.microchip.com

• 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

DS40001607C-page 6  2011-2014 Microchip Technology Inc.

1.0 DEVICE OVERVIEW

The PIC16(L)F1503 are described within this data sheet. The block diagram of these devices are shown in

Figure 1-1, the available peripherals are shown in Table 1-1, and the pinout descriptions are shown in

Table 1-2.

TABLE 1-1: DEVICE PERIPHERAL SUMMARY

Peripheral

PIC12(L)F1501

PIC16(L)F1503

PIC16(L)F1507

PIC16(L)F1508

Analog-to-Digital Converter (ADC) ●●● ● ● Complementary Wave Generator (CWG) ●●● ● ● Digital-to-Analog Converter (DAC) ●● ● ● Enhanced Universal

Synchronous/Asynchronous Receiver/ Transmitter (EUSART)

Fixed Voltage Reference (FVR) ●●● ● ● Numerically Controlled Oscillator (NCO) ●●● ● ● Temperature Indicator ●●● ● ● Comparators

C1 ●● ● ● C2 ● ● ●

Configurable Logic Cell (CLC)

CLC1 ●●● ● ● CLC2 ●●● ● ● CLC3 CLC4 ● ●

Master Synchronous Serial Ports

MSSP1 ● ● ●

PWM Modules

PWM1 ●●● ● ● PWM2 PWM3 PWM4 ●●● ● ●

Timers

Timer0 ●●● ● ● Timer1 ●●● ● ● Timer2

●●● ● ●

● ●

PIC16(L)F1503

PIC16(L)F1509

 2011-2014 Microchip Technology Inc. DS40001607C-page 7

PIC16(L)F1503

CLKOUT

CLKIN

RAM

CPU

(Note 3)

Timing

Generation

INTRC

Oscillator

MCLR

Program

Flash Memory

FVRDAC

ADC

10-bit

Temp

Indicator

C1C2TMR0TMR1TMR2MSSP1

PWM1PWM2PWM3PWM4CLC1CLC2NCO1CWG1

PORTA

PORTC

Rev. 10-000039B

12/16/2013

Note 1: See applicable chapters for more information on peripherals.

2: See Ta bl e 1- 1 for peripherals on specific devices. 3: See Figure 2-1.

FIGURE 1-1: PIC16(L)F1503 BLOCK DIAGRAM

DS40001607C-page 8  2011-2014 Microchip Technology Inc.

PIC16(L)F1503

TABLE 1-2: PIC16(L)F1503 PINOUT DESCRIPTION

Input

Name Function

RA0/AN0/C1IN+/DACOUT1/ ICSPDAT

RA0 TTL CMOS General purpose I/O.

AN0 AN — A/D Channel input.

Typ e

Output

Typ e

C1IN+ AN — Comparator C1 positive input.

DACOUT1 — AN Digital-to-Analog Converter output.

ICSPDAT ST CMOS ICSP™ Data I/O.

RA1/AN1/V ICSPCLK

REF+/C1IN0-/C2IN0-/

RA1 TTL CMOS General purpose I/O.

AN1 AN — A/D Channel input.

REF+ AN — A/D Positive Voltage Reference input.

C1IN0- AN — Comparator C1 negative input.

C2IN0- AN — Comparator C2 negative input.

ICSPCLK ST — Serial Programming Clock.

RA2/AN2/C1OUT/DACOUT2/ T0CKI/INT/PWM3/CLC1

(1)

CWG1FLT

RA2 ST CMOS General purpose I/O.

AN2 AN — A/D Channel input.

C1OUT — CMOS Comparator C1 output.

DACOUT2 — AN Digital-to-Analog Converter output.

T0CKI ST — Timer0 clock input.

INT ST — External interrupt.

PWM3 — CMOS Pulse Width Module source output.

CLC1 — CMOS Configurable Logic Cell source output.

ST — Complementary Waveform Generator Fault input.

RA3/CLC1IN0/V MCLR

PP/T1G

(1)

/SS

RA3 TTL — General purpose input.

CLC1IN0 ST — Configurable Logic Cell source input.

PP HV — Programming voltage.

CWG1FLT

T1G ST — Timer1 Gate input.

ST — Slave Select input.

ST — Master Clear with internal pull-up.

RA4/AN3/NCO1 CLKOUT/T1G

MCLR

(1)

/SDO

(1)

RA4 TTL CMOS General purpose I/O.

AN3 AN — A/D Channel input.

NCO1 — CMOS Numerically Controlled Oscillator output.

SDO — CMOS SPI data output.

CLKOUT — CMOS F

OSC/4 output.

T1G ST — Timer1 Gate input.

RA5/CLKIN/T1CKI/NCO1CLK/ CLC1IN1

RA5 TTL CMOS General purpose I/O.

CLKIN CMOS — External clock input (EC mode).

T1CKI ST — Timer1 clock input.

NCO1CLK ST — Numerically Controlled Oscillator Clock source input.

RC0/AN4/C2IN+/CLC2/SCL/ SCK

CLC1IN1

RC0 TTL CMOS General purpose I/O.

AN4 AN — A/D Channel input.

—

CLC1 input.

C2IN+ AN — Comparator C2 positive input.

CLC2 — CMOS Configurable Logic Cell source output.

SCL I

CODI2C™ clock.

SCK ST CMOS SPI clock.

Legend: AN = Analog input or output CMOS= CMOS compatible input or output OD = Open Drain

TTL = TTL compatible input ST = Schmitt Trigger input with CMOS levels I HV = High Voltage XTAL = Crystal levels

Note 1: Alternate pin function selected with the APFCON (Register 11-1) register.

Description

C™ = Schmitt Trigger input with I2C

 2011-2014 Microchip Technology Inc. DS40001607C-page 9

PIC16(L)F1503

TABLE 1-2: PIC16(L)F1503 PINOUT DESCRIPTION (CONTINUED)

Input

Name Function

RC1/AN5/C1IN1-/C2IN1-/PWM4/

(1)

/SDA/SDI

NCO1

RC2/AN6/C1IN2-/C2IN2-/SDO

RC3/AN7/C1IN3-/C2IN3-/PWM2/ CLC2IN0

RC4/C2OUT/CLC2IN1/CWG1B RC4 TTL CMOS General purpose I/O.

(1)

RC5/PWM1/CLC1 CWG1A

DD VDD Power — Positive supply.

SS VSS Power — Ground reference.

Legend: AN = Analog input or output CMOS= CMOS compatible input or output OD = Open Drain

Note 1: Alternate pin function selected with the APFCON (Register 11-1) register.

TTL = TTL compatible input ST = Schmitt Trigger input with CMOS levels I HV = High Voltage XTAL = Crystal levels

RC1 TTL CMOS General purpose I/O.

AN5 AN — A/D Channel input.

C1IN1- AN — Comparator C1 negative input.

C2IN1- AN — Comparator C2 negative input.

PWM4 — CMOS Pulse Width Module source output.

NCO1 — CMOS Numerically Controlled Oscillator is source output.

SDA I

SDI CMOS — SPI data input.

(1)

RC2 TTL CMOS General purpose I/O.

AN6 AN — A/D Channel input.

C1IN2- AN — Comparator C1 negative input.

C2IN2- AN — Comparator C2 negative input.

SDO — CMOS SPI data output.

RC3 TTL CMOS General purpose I/O.

AN7 AN — A/D Channel input.

C1IN3- AN — Comparator C1 negative input.

C2IN3- AN — Comparator C2 negative input.

PWM2 — CMOS Pulse Width Module source output.

CLC2IN0 ST — Configurable Logic Cell source input.

C2OUT — CMOS Comparator C2 output.

CLC2IN1 ST — Configurable Logic Cell source input.

CWG1B — CMOS CWG complementary output.

RC5 TTL CMOS General purpose I/O.

PWM1 — CMOS PWM output.

CLC1 — CMOS Configurable Logic Cell source output.

CWG1A — CMOS CWG primary output.

Output

Typ e

CODI2C data input/output.

Description

C™ = Schmitt Trigger input with I2C

DS40001607C-page 10  2011-2014 Microchip Technology Inc.

2.0 ENHANCED MID-RANGE CPU

Program Counter

MUX

Addr MUX

16-Level Stack

(15-bit)

Program Memory

Read (PMR)

Instruction Reg

Configuration

FSR0 Reg

FSR1 Reg

BSR Reg

STATUS Reg

RAM

WReg

Power-up

Timer

Power-on

Reset

Watchdog

Timer

Brown-out

Reset

Instruction

Decode and

Control

Timing

Generation

Internal

Oscillator

Block

ALU

Flash

Program

Memory

MUX

Data Bus

Program

Bus

Direct Addr

Indirect

Addr

RAM Addr

CLKIN

CLKOUT

DD VSS

Rev. 10-000055A

7/30/2013

This family of devices contain an enhanced mid-range 8-bit CPU core. The CPU has 49 instructions. Interrupt capability includes automatic context saving. The hardware stack is 16 levels deep and has Overflow and Underflow Reset capability. Direct, Indirect, and Relative addressing modes are available. Two File Select Registers (FSRs) provide the ability to read program and data memory.

• Automatic Interrupt Context Saving

• 16-level Stack with Overflow and Underflow

• File Select Registers

• Instruction Set

FIGURE 2-1: CORE BLOCK DIAGRAM

PIC16(L)F1503

 2011-2014 Microchip Technology Inc. DS40001607C-page 11

PIC16(L)F1503

2.1 Automatic Interrupt Context Saving

During interrupts, certain registers are automatically saved in shadow registers and restored when returning from the interrupt. This saves stack space and user code. See Section 7.5 “Automatic Context Saving”, for more information.

2.2 16-Level Stack with Overflow and Underflow

These devices have a hardware stack memory 15 bits wide and 16 words deep. A Stack Overflow or Underflow will set the appropriate bit (STKOVF or STKUNF) in the PCON register, and if enabled, will cause a software Reset. See section Section 3.4 “Stack” for more details.

2.3 File Select Registers

There are two 16-bit File Select Registers (FSR). FSRs can access all file registers and program memory, which allows one Data Pointer for all memory. When an FSR points to program memory, there is one additional instruction cycle in instructions using INDF to allow the data to be fetched. General purpose memory can now also be addressed linearly, providing the ability to access contiguous data larger than 80 bytes. There are also new instructions to support the FSRs. See

Section 3.5 “Indirect Addressing” for more details.

2.4 Instruction Set

There are 49 instructions for the enhanced mid-range CPU to support the features of the CPU. See

Section 27.0 “Instruction Set Summary” for more

details.

DS40001607C-page 12  2011-2014 Microchip Technology Inc.

PIC16(L)F1503

3.0 MEMORY ORGANIZATION

These devices contain the following types of memory:

• Program Memory

- Configuration Words

- Device ID

-User ID

- Flash Program Memory

• Data Memory

- Core Registers

- Special Function Registers

- General Purpose RAM

- Common RAM

The following features are associated with access and control of program memory and data memory:

• PCL and PCLATH

•Stack

• Indirect Addressing

3.1 Program Memory Organization

The enhanced mid-range core has a 15-bit program counter capable of addressing a 32K x 14 program memory space. Table 3-1 shows the memory sizes implemented. Accessing a location above these boundaries will cause a wrap-around within the implemented memory space. The Reset vector is at 0000h and the interrupt vector is at 0004h (See

Figure 3-1).

TABLE 3-1: DEVICE SIZES AND ADDRESSES

Device

PIC16LF1503 PIC16F1503

Note 1: High-endurance Flash applies to low byte of each address in the range.

Program Memory

Space (Words)

2,048 07FFh 0780h-07FFh

Last Program Memory

Address

High-Endurance Flash

Memory Address Range

(1)

 2011-2014 Microchip Technology Inc. DS40001607C-page 13

PIC16(L)F1503

Stack Level 0

Stack Level 15

Stack Level 1

Reset Vector

PC<14:0>

Interrupt Vector

Page 0

Rollover to Page 0

0000h

0004h 0005h

07FFh 0800h

7FFFh

CALL, CALLW

RETURN, RETLW

Interrupt, RETFIE

On-chip Program Memory

Rev. 10-000040C

7/30/2013

constants

BRW ;Add Index in W to

;program counter to

;select data RETLW DATA0 ;Index0 data RETLW DATA1 ;Index1 data RETLW DATA2 RETLW DATA3

my_function

;… LOTS OF CODE… MOVLW DATA_INDEX call constants ;… THE CONSTANT IS IN W

FIGURE 3-1: PROGRAM MEMORY MAP

AND STACK FOR PIC16(L)F1503

3.1.1 READING PROGRAM MEMORY AS DATA

There are two methods of accessing constants in program memory. The first method is to use tables of RETLW instructions. The second method is to set an FSR to point to the program memory.

3.1.1.1 RETLW Instruction

The RETLW instruction can be used to provide access to tables of constants. The recommended way to create such a table is shown in Example 3-1.

EXAMPLE 3-1: RETLW INSTRUCTION

The BRW instruction makes this type of table very simple to implement. If your code must remain portable with previous generations of microcontrollers, then the BRW instruction is not available so the older table read method must be used.

DS40001607C-page 14  2011-2014 Microchip Technology Inc.

3.1.1.2 Indirect Read with FSR

constants

RETLW DATA0 ;Index0 data RETLW DATA1 ;Index1 data RETLW DATA2 RETLW DATA3

my_function

;… LOTS OF CODE… MOVLW LOW constants MOVWF FSR1L MOVLW HIGH constants MOVWF FSR1H MOVIW 0[FSR1]

;THE PROGRAM MEMORY IS IN W

The program memory can be accessed as data by setting bit 7 of the FSRxH register and reading the matching INDFx register. The MOVIW instruction will place the lower eight bits of the addressed word in the W register. Writes to the program memory cannot be performed via the INDF registers. Instructions that access the program memory via the FSR require one extra instruction cycle to complete. Example 3-2 demonstrates accessing the program memory via an FSR.

The HIGH operator will set bit<7> if a label points to a location in program memory.

EXAMPLE 3-2: ACCESSING PROGRAM

MEMORY VIA FSR

PIC16(L)F1503

 2011-2014 Microchip Technology Inc. DS40001607C-page 15

PIC16(L)F1503

Addresses BANKx

x00h or x80h INDF0 x01h or x81h INDF1 x02h or x82h PCL x03h or x83h STATUS x04h or x84h FSR0L x05h or x85h FSR0H x06h or x86h FSR1L x07h or x87h FSR1H x08h or x88h BSR

x09h or x89h WREG x0Ah or x8Ah PCLATH x0Bh or x8Bh INTCON

3.2 Data Memory Organization

The data memory is partitioned in 32 memory banks with 128 bytes in a bank. Each bank consists of (Figure 3-2):

• 12 core registers

• 20 Special Function Registers (SFR)

• Up to 80 bytes of General Purpose RAM (GPR)

• 16 bytes of common RAM

The active bank is selected by writing the bank number into the Bank Select Register (BSR). Unimplemented memory will read as ‘0’. All data memory can be accessed either directly (via instructions that use the file registers) or indirectly via the two File Select Registers (FSR). See Section3.5 “Indirect

Addressing” for more information.

Data memory uses a 12-bit address. The upper five bits of the address define the Bank address and the lower seven bits select the registers/RAM in that bank.

3.2.1 CORE REGISTERS

The core registers contain the registers that directly affect the basic operation. The core registers occupy the first 12 addresses of every data memory bank (addresses x00h/x08h through x0Bh/x8Bh). These registers are listed below in Ta b le 3- 2. For detailed information, see Tab le 3 -4 .

TABLE 3-2: CORE REGISTERS

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PIC16(L)F1503

3.2.1.1 STATUS Register

The STATUS register, shown in Register 3-1, contains:

• the arithmetic status of the ALU

• the Reset status

The STATUS register can be the destination for any instruction, like any other register. If the STATUS register is the destination for an instruction that affects the Z, DC or C bits, then the write to these three bits is disabled. These bits are set or cleared according to the device logic. Furthermore, the TO writable. Therefore, the result of an instruction with the STATUS register as destination may be different than intended.

and PD bits are not

For example, CLRF STATUS will clear the upper three bits and set the Z bit. This leaves the STATUS register as ‘000u u1uu’ (where u = unchanged).

It is recommended, therefore, that only BCF, BSF, SWAPF and MOVWF instructions are used to alter the STATUS register, because these instructions do not affect any Status bits. For other instructions not affecting any Status bits (Refer to

Section27.0 “Instruction Set Summary”).

Note 1: The C and DC bits operate as Borrow

and Digit Borrow out bits, respectively, in subtraction.

REGISTER 3-1: STATUS: STATUS REGISTER

U-0 U-0 U-0 R-1/q R-1/q R/W-0/u R/W-0/u R/W-0/u

— — —

bit 7 bit 0

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ u = Bit is unchanged x = Bit is unknown -n/n = Value at POR and BOR/Value at all other Resets ‘1’ = Bit is set ‘0’ = Bit is cleared q = Value depends on condition

PD ZDC

(1)

bit 7-5 Unimplemented: Read as ‘0’ bit 4 TO

bit 3 PD

bit 2 Z: Zero bit

bit 1 DC: Digit Carry/Digit Borrow bit (ADDWF, ADDLW, SUBLW, SUBWF instructions)

bit 0 C: Carry/Borrow

Note 1: For Borrow, the polarity is reversed. A subtraction is executed by adding the two’s complement of the

second operand. For rotate (RRF, RLF) instructions, this bit is loaded with either the high-order or low-order bit of the source register.

: Time-Out bit

1 = After power-up, CLRWDT instruction or SLEEP instruction 0 = A WDT time-out occurred

: Power-Down bit

1 = After power-up or by the CLRWDT instruction 0 = By execution of the SLEEP instruction

1 = The result of an arithmetic or logic operation is zero 0 = The result of an arithmetic or logic operation is not zero

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

(1)

bit

(ADDWF, ADDLW, SUBLW, 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

(1)

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PIC16(L)F1503

Memory Region7-bit Bank Offset

00h

0Bh

0Ch

1Fh 20h

6Fh

7Fh

70h

Core Registers

(12 bytes)

Special Function Registers

(20 bytes maximum)

General Purpose RAM

(80 bytes maximum)

Common RAM

(16 bytes)

Rev. 10-000041A

7/30/2013

3.2.2 SPECIAL FUNCTION REGISTER

The Special Function Registers are registers used by the application to control the desired operation of peripheral functions in the device. The Special Function Registers occupy the 20 bytes after the core registers of every data memory bank (addresses x0Ch/x8Ch through x1Fh/x9Fh). The registers associated with the operation of the peripherals are described in the appropriate peripheral chapter of this data sheet.

3.2.3 GENERAL PURPOSE RAM

There are up to 80 bytes of GPR in each data memory bank. The Special Function Registers occupy the 20 bytes after the core registers of every data memory bank (addresses x0Ch/x8Ch through x1Fh/x9Fh).

3.2.3.1 Linear Access to GPR

The general purpose RAM can be accessed in a non-banked method via the FSRs. This can simplify access to large memory structures. See

Section3.5.2 “Linear Data Memory” for more

information.

3.2.4 COMMON RAM

There are 16 bytes of common RAM accessible from all banks.

FIGURE 3-2: BANKED MEMORY

PARTITIONING

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 2011-2014 Microchip Technology Inc. DS40001607C-page 19

3.2.5 DEVICE MEMORY MAPS

The memory maps for Bank 0 through Bank 31 are shown in the tables in this section.

TABLE 3-3: PIC16(L)F1503 MEMORY MAP

BANK 0 BANK 1 BANK 2 BANK 3 BANK 4 BANK 5 BANK 6 BANK 7

000h

Core Registers

(Ta bl e 3 - 2)

00Bh 08Bh 10Bh 18Bh 20Bh 28Bh 30Bh 38Bh 00Ch PORTA 08Ch TRISA 10Ch LATA 18Ch ANSELA 20Ch WPUA 28Ch 00Dh 00Eh PORTC 08Eh TRISC 10Eh LATC 18Eh ANSELC 20Eh 00Fh 010h 011h PIR1 091h PIE1 111h CM1CON0 191h PMADRL 211h 012h PIR2 092h PIE2 112h CM1CON1 192h PMADRH 212h 013h PIR3 093h PIE3 113h CM2CON0 193h PMDATL 213h 014h 015h TMR0 095h OPTION_REG 115h CMOUT 195h PMCON1 215h 016h 017h 018h 019h 01Ah 01Bh 01Ch 01Dh 01Eh 01Fh 020h

06Fh 070h

07Fh 0FFh 17Fh 1FFh 27Fh 2FFh 37Fh 3FFh

Legend: = Unimplemented data memory locations, read as ‘0’

— 08Dh — 10Dh — 18Dh — 20Dh — 28Dh — 30Dh — 38Dh —

—08Fh—10Fh—18Fh—20Fh—28Fh—30Fh—38Fh— —090h—110h—190h—210h—290h

—094h— 114h CM2CON1 194h PMDATH 214h

TMR1L 096h PCON 116h BORCON 196h PMCON2 216h TMR1H 097h WDTCON 117h FVRCON 197h VREGCON 217h T1CON 098h

T1GCON 099h OSCCON 119h

TMR2 09Ah OSCSTAT 11Ah

PR2 09BhADRESL11Bh

T2CON 09Ch ADRESH 11Ch

— 09Dh ADCON0 11Dh APFCON 19Dh — —

General

Purpose Register 80 Bytes

Common RAM

080h

Core Registers

(Ta bl e 3 - 2)

—118h

09Eh ADCON1 11Eh 09Fh ADCON2 11Fh

0A0h

0BFh 0C0h

0EFh 0F0h

General Purpose Register 32 Bytes

Unimplemented

Read as ‘0’

Common RAM

(Accesses 70h – 7Fh)

100h

120h

16Fh 1EFh 26Fh 2EFh 170h

Core Registers

(Table 3-2)

DACCON0 DACCON1

—19Ah —19Bh — 19Ch

— —19Fh

Unimplemented

Read as ‘0’

Common RAM

(Accesses

70h – 7Fh)

180h

Core Registers

(Table 3-2)

198h —218h 199h

19Eh

1A0h

1F0h

— — — — — — —

Unimplemented

Read as ‘0’

Common RAM

(Accesses 70h – 7Fh)

200h

219h 21Ah 21Bh 21Ch 21Dh 21Eh 21Fh

220h

270h

Core Registers

(Table 3-2)

SSP1BUF SSP1ADD SSP1MSK

SSP1STAT SSP1CON1 SSP1CON2 SSP1CON3

Unimplemented

Read as ‘0’

Common RAM

(Accesses 70h – 7Fh)

280h

Core Registers

(Table 3-2)

— 30Ch — 38Ch —

—28Eh—30Eh—38Eh—

— 291h 292h 293h 294h 295h

296h 297h

— —299h— 319h — 399h — —29Ah—31Ah—39Ah— —29Bh—31Bh — 29Ch — 31Ch — — —

298h

29Dh 29Eh 29Fh

2A0h

2F0h

—

— 316h — 396h

— 317h — 397h —

— 318h — 398h —

—

Unimplemented

Read as ‘0’

Common RAM

(Accesses 70h – 7Fh)

300h

Core Registers

(Table 3-2)

310h 311h 312h 313h 314h 315h

31Dh 31Eh 31Fh

320h

36Fh 3EFh 370h

— 390h — — — — — —

— — — — —

Unimplemented

Read as ‘0’

Common RAM

(Accesses 70h – 7Fh)

380h

Core Registers

(Table 3-2)

391h IOCAP 392h IOCAN 393h 394h 395h

39Bh 39Ch 39Dh 39Eh 39Fh

3A0h

3F0h

IOCAF

— — —

— — — — —

Unimplemented

Read as ‘0’

Common RAM

(Accesses 70h – 7Fh)

PIC16(L)F1503

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TABLE 3-3: PIC16(L)F1503 MEMORY MAP (CONTINUED)

PIC16(L)F1503

BANK 8 BANK 9 BANK 10 BANK 11 BANK 12 BANK 13 BANK 14 BANK 15

400h

Core Registers

(Ta bl e 3 - 2)

40Bh 40Ch 40Dh 40Eh 40Fh 410h

411h 412h 413h 414h 415h 416h 417h 418h 419h 41Ah 41Bh 41Ch 41Dh 41Eh 41Fh

420h

46Fh 4EFh 56Fh 5EFh 66Fh 6EFh 76Fh 7EFh 470h

47Fh 4FFh 57Fh 5FFh 67Fh 6FFh 77Fh 7FFh

— 48Ch — 50Ch — 58Ch — 60Ch — 68Ch — 70Ch — 78Ch — — 48Dh — 50Dh — 58Dh — 60Dh — 68Dh — 70Dh — 78Dh — —48Eh—50Eh—58Eh—60Eh—68Eh—70Eh—78Eh— —48Fh—50Fh—58Fh—60Fh—68Fh—70Fh—78Fh— —490h—510h—590h—610h—690h— 710h — 790h — —491h—511h—591h— 611h PWM1DCL 691h CWG1DBR 711h — 791h — —492h—512h—592h— 612h PWM1DCH 692h CWG1DBF 712h — 792h — —493h—513h—593h— 613h PWM1CON 693h CWG1CON0 713h — 793h — —494h—514h—594h— 614h PWM2DCL 694h CWG1CON1 714h — 794h — —495h—515h—595h— 615h PWM2DCH 695h CWG1CON2 715h — 795h — —496h—516h—596h— 616h PWM2CON 696h — 716h — 796h — —497h—517h—597h— 617h PWM3DCL 697h — 717h — 797h — — 498h NCO1ACCL 518h —598h— 618h PWM3DCH 698h — 718h — 798h — — 499h NCO1ACCH 519h —599h— 619h PWM3CON 699h — 719h — 799h — — 49Ah NCO1ACCU 51Ah —59Ah— 61Ah PWM4DCL 69Ah —71Ah—79Ah— — 49Bh NCO1INCL 51Bh —59Bh— 61Bh PWM4DCH 69Bh —71Bh—79Bh— — 49Ch NCO1INCH 51Ch — 59Ch — 61Ch PWM4CON 69Ch — 71Ch — 79Ch — — 49Dh — 51Dh — 59Dh — 61Dh — 69Dh — 71Dh — 79Dh — — 49Eh NCO1CON 51Eh —59Eh—61Eh—69Eh—71Eh—79Eh— — 49Fh NCO1CLK 51Fh —59Fh—61Fh—69Fh—71Fh—79Fh—

Unimplemented

Read as ‘0’

Common RAM

(Accesses

70h – 7Fh)

480h

48Bh

4A0h

4F0h

Core Registers

(Ta bl e 3 - 2)

Unimplemented

Read as ‘0’

Common RAM

(Accesses 70h – 7Fh)

500h

50Bh

520h

570h

Core Registers

(Table 3-2)

Unimplemented

Read as ‘0’

Common RAM

(Accesses

70h – 7Fh)

580h

58Bh

5A0h

5F0h

Core Registers

(Table 3-2)

Unimplemented

Read as ‘0’

Common RAM

(Accesses 70h – 7Fh)

600h

60Bh

620h

670h

Core Registers

(Table 3-2)

Unimplemented

Read as ‘0’

Common RAM

(Accesses 70h – 7Fh)

680h

68Bh

6A0h

6F0h

Core Registers

(Table 3-2)

Unimplemented

Read as ‘0’

Common RAM

(Accesses 70h – 7Fh)

700h

70Bh

720h

770h

Core Registers

(Table 3-2)

Unimplemented

Read as ‘0’

Common RAM

(Accesses 70h – 7Fh)

780h

78Bh

7A0h

7F0h

Core Registers

(Table 3-2)

Unimplemented

Read as ‘0’

Common RAM

(Accesses 70h – 7Fh)

BANK 16 BANK 17 BANK 18 BANK 19 BANK 20 BANK 21 BANK 22 BANK 23

800h

Core Registers

(Ta bl e 3 - 2 ) 80Bh 80Ch

Unimplemented

Read as ‘0’

86Fh 8EFh 96Fh 870h

Common RAM

(Accesses

87Fh 8FFh 97Fh 9FFh A7Fh AFFh B7Fh BFFh

Legend: = Unimplemented data memory locations, read as ‘0’

70h – 7Fh)

880h

88Bh 88Ch

8F0h

Core Registers

(Ta bl e 3 - 2)

Unimplemented

Read as ‘0’

Common RAM

(Accesses 70h – 7Fh)

900h

90Bh 90Ch

970h

Core Registers

(Table 3-2)

Unimplemented

Read as ‘0’

Common RAM

(Accesses

70h – 7Fh)

980h

98Bh 98Ch

9EFh

9F0h

Core Registers

(Table 3-2)

Unimplemented

Read as ‘0’

Common RAM

(Accesses 70h – 7Fh)

A00h

A0Bh A0Ch

A6Fh A70h

Core Registers

(Table 3-2)

Unimplemented

Read as ‘0’

Common RAM

(Accesses 70h – 7Fh)

A80h

A8Bh A8Ch

AEFh

AF0h

Core Registers

(Table 3-2)

Unimplemented

Read as ‘0’

Common RAM

(Accesses 70h – 7Fh)

B00h

B0Bh B0Ch

B6Fh B70h

Core Registers

(Table 3-2)

Unimplemented

Read as ‘0’

Common RAM

(Accesses 70h – 7Fh)

B80h

B8Bh B8Ch

BEFh BF0h

Core Registers

(Table 3-2)

Unimplemented

Read as ‘0’

Common RAM

(Accesses 70h – 7Fh)

 2011-2014 Microchip Technology Inc. DS40001607C-page 21

Legend: = Unimplemented data memory locations, read as ‘0’.

BANK 24 BANK 25 BANK 26 BANK 27 BANK 28 BANK 29 BANK 30 BANK 31

C00h

C0Bh

Core Registers

(Ta bl e 3 - 2)

C80h

C8Bh

Core Registers

(Ta bl e 3 - 2)

D00h

D0Bh

Core Registers

(Ta bl e 3 - 2)

D80h

D8Bh

Core Registers

(Ta bl e 3 - 2)

E00h

E0Bh

Core Registers

(Ta bl e 3 - 2)

E80h

E8Bh

Core Registers

(Ta bl e 3 - 2)

F00h

F0Bh

Core Registers

(Ta bl e 3 - 2)

F80h

F8Bh

Core Registers

(Ta bl e 3 - 2)

C0Ch

—C8Ch—D0Ch—D8Ch—E0Ch—E8Ch—F0Ch

See Tab l e 3 -3 for register mapping

details

F8Ch

See Tab l e 3 -3 for register mapping

details

C0Dh

—C8Dh—D0Dh—D8Dh—E0Dh—E8Dh— F0Dh F8Dh

C0Eh

—C8Eh—D0Eh—D8Eh—E0Eh—E8Eh— F0Eh F8Eh

C0Fh

—C8Fh—D0Fh—D8Fh—E0Fh—E8Fh— F0Fh F8Fh

C10h

—C90h—D10h—D90h—E10h—E90h— F10h F90h

C11h

—C91h—D11h—D91h—E11h—E91h— F11h F91h

C12h

—C92h—D12h—D92h—E12h—E92h— F12h F92h

C13h

—C93h—D13h—D93h—E13h—E93h— F13h F93h

C14h

—C94h—D14h—D94h—E14h—E94h— F14h F94h

C15h

—C95h—D15h—D95h—E15h—E95h— F15h F95h

C16h

—C96h—D16h—D96h—E16h—E96h— F16h F96h

C17h

—C97h—D17h—D97h—E17h—E97h— F17h F97h

C18h

—C98h—D18h—D98h—E18h—E98h— F18h F98h

C19h

—C99h—D19h—D99h—E19h—E99h— F19h F99h

C1Ah

—C9Ah—D1Ah—D9Ah—E1Ah—E9Ah— F1Ah F9Ah

C1Bh

—C9Bh—D1Bh—D9Bh—E1Bh—E9Bh— F1Bh F9Bh

C1Ch

—C9Ch—D1Ch—D9Ch—E1Ch—E9Ch— F1Ch F9Ch

C1Dh

—C9Dh—D1Dh—D9Dh—E1Dh—E9Dh— F1Dh F9Dh

C1Eh

—C9Eh—D1Eh—D9Eh—E1Eh—E9Eh— F1Eh F9Eh

C1Fh

—C9Fh—D1Fh—D9Fh—E1Fh—E9Fh— F1Fh F9Fh

C20h

Unimplemented

Read as ‘0’

CA0h

Unimplemented

Read as ‘0’

D20h

Unimplemented

Read as ‘0’

DA0h

Unimplemented

Read as ‘0’

E20h

Unimplemented

Read as ‘0’

EA0h

Unimplemented

Read as ‘0’

F20h FA0h

C6Fh CEFh D6Fh DEFh E6Fh EEFh F6Fh FEFh C70h

Common RAM

(Accesses

70h – 7Fh)

CF0h

Common RAM

(Accesses 70h – 7Fh)

D70h

Common RAM

(Accesses

70h – 7Fh)

DF0h

Common RAM

(Accesses 70h – 7Fh)

E70h

Common RAM

(Accesses 70h – 7Fh)

EF0h

Common RAM

(Accesses

70h – 7Fh)

F70h

Common RAM

(Accesses

70h – 7Fh)

FF0h

Common RAM

(Accesses 70h – 7Fh)

CFFh

CFFh D7Fh DFFh E7Fh EFFh F7Fh FFFh

TABLE 3-3: PIC16(L)F1503 MEMORY MAP (CONTINUED)

PIC16(L)F1503

Bank 30

F0Ch

—

F0Dh

—

F0Eh

—

F0Fh

CLCDATA

F10h

CLC1CON

F11h

CLC1POL

F12h

CLC1SEL0

F13h

CLC1SEL1

F14h

CLC1GLS0

F15h

CLC1GLS1

F16h

CLC1GLS2

F17h

CLC1GLS3

F18h

CLC2CON

F19h

CLC2POL

F1Ah

CLC2SEL0

F1Bh

CLC2SEL1

F1Ch

CLC2GLS0

F1Dh

CLC2GLS1

F1Eh

CLC2GLS2

F1Fh

CLC2GLS3

F20h

Unimplemented

Read as ‘0’

F6Fh

Bank 31

F8Ch

FE3h

Unimplemented

Read as ‘0’

FE4h

STATUS_SHAD

FE5h

WREG_SHAD

FE6h

BSR_SHAD

FE7h

PCLATH_SHAD

FE8h

FSR0L_SHAD

FE9h

FSR0H_SHAD

FEAh

FSR1L_SHAD

FEBh

FSR1H_SHAD

FECh

—

FEDh

STKPTR

FEEh

TOSL

FEFh

TOSH

Legend: = Unimplemented data memory locations, read as ‘0’.

TABLE 3-3: PIC16(L)F1503 MEMORY MAP (CONTINUED)

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PIC16(L)F1503

3.2.6 CORE FUNCTION REGISTERS SUMMARY

The Core Function registers listed in Ta bl e 3- 4 can be addressed from any Bank.

TABLE 3-4: CORE FUNCTION REGISTERS SUMMARY

Addr Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

Bank 0-31

x00h or

INDF0

x80h

x01h or

INDF1

x81h

x02h or

PCL Program Counter (PC) Least Significant Byte 0000 0000 0000 0000

x82h

x03h or

STATUS

x83h

x04h or

FSR0L Indirect Data Memory Address 0 Low Pointer 0000 0000 uuuu uuuu

x84h

x05h or

FSR0H Indirect Data Memory Address 0 High Pointer 0000 0000 0000 0000

x85h

x06h or

FSR1L Indirect Data Memory Address 1 Low Pointer 0000 0000 uuuu uuuu

x86h

x07h or

FSR1H Indirect Data Memory Address 1 High Pointer 0000 0000 0000 0000

x87h

x08h or

BSR

x88h

x09h or

WREG Working Register 0000 0000 uuuu uuuu

x89h

x0Ah or

PCLATH

x8Ah

x0Bh or

INTCON GIE PEIE TMR0IE INTE IOCIE TMR0IF INTF IOCIF 0000 0000 0000 0000

x8Bh

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

Addressing this location uses contents of FSR0H/FSR0L to address data memory (not a physical register)

Addressing this location uses contents of FSR1H/FSR1L to address data memory (not a physical register)

— — —TOPD ZDCC---1 1000 ---q quuu

— — —BSR<4:0>---0 0000 ---0 0000

— Write Buffer for the upper 7 bits of the Program Counter -000 0000 -000 0000

Shaded locations are unimplemented, read as ‘0’.

Val ue o n

POR, BOR

xxxx xxxx uuuu uuuu

Value on all

other Resets

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PIC16(L)F1503

TABLE 3-5: SPECIAL FUNCTION REGISTER SUMMARY

Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

Value o n

POR, BOR

Bank 0

00Ch PORTA — — RA5 RA4 RA3 RA2 RA1 RA0 --xx xxxx --xx xxxx

00Dh

00Eh PORTC

00Fh

010h

011h PIR1 TMR1GIF ADIF

012h PIR2

013h PIR3

014h

015h TMR0 Holding Register for the 8-bit Timer0 Count xxxx xxxx uuuu uuuu

016h TMR1L Holding Register for the Least Significant Byte of the 16-bit TMR1 Count xxxx xxxx uuuu uuuu

017h TMR1H Holding Register for the Most Significant Byte of the 16-bit TMR1 Count xxxx xxxx uuuu uuuu

018h T1CON TMR1CS<1:0> T1CKPS<1:0>

019h T1GCON TMR1GE T1GPOL T1GTM T1GSPM T1GGO/

01Ah TMR2 Timer2 Module Register 0000 0000 0000 0000

01Bh PR2 Timer2 Period Register 1111 1111 1111 1111

01Ch T2CON

Bank 1

08Ch TRISA

08Dh

08Eh TRISC

08Fh

090h

091h PIE1 TMR1GIE ADIE

092h PIE2

093h PIE3

094h

095h

096h PCON STKOVF STKUNF

097h WDTCON

098h

099h OSCCON

09Ah OSCSTAT

09Bh ADRESL ADC Result Register Low xxxx xxxx uuuu uuuu

09Ch ADRESH ADC Result Register High xxxx xxxx uuuu uuuu

09Dh ADCON0

09Eh ADCON1 ADFM ADCS<2:0>

09Fh ADCON2 TRIGSEL<3:0>

Legend: x = unknown, u = unchanged, q = value depends on condition, - = unimplemented, r = reserved. Shaded locations are unimplemented, read as ‘0’. Note 1: PIC16F1503 only.

— Unimplemented — —

— — RC5 RC4 RC3 RC2 RC1 RC0 --xx xxxx --xx xxxx

— Unimplemented — —

— — SSP1IF — TMR2IF TMR1IF 00-- 0-00 00-- 0-00

— C2IF C1IF — BCL1IF NCO1IF — — -00- 00-- -00- 00--

— — — — — — CLC2IF CLC1IF ---- --00 ---- --00

— Unimplemented — —

— T1SYNC —TMR1ON0000 -0-0 uuuu -u-u

DONE

— T2OUTPS<3:0> TMR2ON T2CKPS<1:0> -000 0000 -000 0000

01Dh

— Unimplemented — —

01Fh

— — TRISA5 TRISA4 —

— Unimplemented — —

— — TRISC5 TRISC4 TRISC3 TRISC2 TRISC1 TRISC0 --11 1111 --11 1111

— Unimplemented — —

— — SSP1IE — TMR2IE TMR1IE 0000 0-00 0000 0-00

— C2IE C1IE — BCL1IE NCO1IE — — 000- 00-- 000- 00--

— — — — — — CLC2IE CLC1IE ---- --00 ---- --00

— Unimplemented — —

OPTION_REG

— Unimplemented — —

2: Unimplemented, read as ‘1’.

WPUEN INTEDG TMR0CS TMR0SE PSA PS<2:0> 1111 1111 1111 1111

—RWDTRMCLR RI POR BOR 00-1 11qq qq-q qquu

— — WDTPS<4:0> SWDTEN --01 0110 --01 0110

— IRCF<3:0> —SCS<1:0>-011 1-00 -011 1-00

— — —HFIOFR— — LFIOFR HFIOFS ---0 --00 ---q --qq

— CHS<4:0>

T1GVAL T1GSS<1:0> 0000 0x00 uuuu uxuu

(2)

TRISA2 TRISA1 TRISA0 --11 1111 --11 1111

GO/DONE

— —

— — — — 0000 ---- 0000 ----

ADPREF<1:0>

ADON -000 0000 -000 0000

0000 --00 0000 --00

Value on all

other

Resets

DS40001607C-page 24  2011-2014 Microchip Technology Inc.

PIC16(L)F1503

TABLE 3-5: SPECIAL FUNCTION REGISTER SUMMARY (CONTINUED)

Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

Value o n

POR, BOR

Bank 2

10Ch LATA — —LATA5LATA4— L ATA2 LATA 1 L ATA0 --xx -xxx --uu -uuu

10Dh

10Eh LATC

10Fh

110h

111h CM1CON0 C1ON C1OUT C1OE C1POL

115h CMOUT

116h BORCON SBOREN BORFS

117h FVRCON FVREN FVRRDY TSEN TSRNG CDAFVR<1:0> ADFVR<1:0> 0q00 0000 0q00 0000

118h DAC1CON0 DACEN

119h DAC1CON1

11Dh APFCON

11Eh

11Fh

— Unimplemented — —

— — L ATC 5 L ATC4 LATC 3 L ATC2 L ATC 1 L ATC 0 --xx xxxx --uu uuuu

— Unimplemented — —

— C1SP C1HYS C1SYNC 0000 -100 0000 -100

112 h

— Unimplemented — —

114 h

— — — — — —MC2OUT MC1OUT---- --00 ---- --00

— — — — — BORRDY 10-- ---q uu-- ---u

— DACOE1 DACOE2 — DACPSS — — 0-00 -0-- 0-00 -0--

— — — DACR<4:0> ---0 0000 ---0 0000

11A h

— Unimplemented — —

11C h

— — SDOSEL SSSEL T1GSEL — CLC1SEL NCO1SEL --00 0-00 --00 0-00

— Unimplemented — —

Bank 3

18Ch ANSELA — — — ANSA4 — ANSA2 ANSA1 ANSA0 ---1 -111 ---1 -111

18Dh

18Eh ANSELC

18Fh

190h

191h PMADRL Flash Program Memory Address Register Low Byte 0000 0000 0000 0000

192h PMADRH

193h PMDATL Flash Program Memory Read Data Register Low Byte xxxx xxxx uuuu uuuu

194h PMDATH

195h PMCON1

196h PMCON2 Flash Program Memory Control Register 2 0000 0000 0000 0000

197h VREGCON

Legend: x = unknown, u = unchanged, q = value depends on condition, - = unimplemented, r = reserved. Shaded locations are unimplemented, read as ‘0’. Note 1: PIC16F1503 only.

— Unimplemented — —

— — — — ANSC3 ANSC2 ANSC1 ANSC0 ---- 1111 ---- 1111

— Unimplemented — —

(2)

—

Flash Program Memory Address Register High Byte 1000 0000 1000 0000

— — Flash Program Memory Read Data Register High Byte --xx xxxx --uu uuuu

(2)

—

(1)

— — ————VREGPMReserved ---- --01 ---- --01

198h

— Unimplemented — —

19Fh

2: Unimplemented, read as ‘1’.

CFGS LWLO FREE WRERR WREN WR RD 1000 x000 1000 q000

Value on all

other

Resets

 2011-2014 Microchip Technology Inc. DS40001607C-page 25

PIC16(L)F1503

TABLE 3-5: SPECIAL FUNCTION REGISTER SUMMARY (CONTINUED)

Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

Bank 4

20Ch WPUA — — WPUA5 WPUA4 WPUA3 WPUA2 WPUA1 WPUA0 --11 1111 --11 1111

20Dh

— Unimplemented — —

212h

213h SSP1MSK MSK<7:0> 1111 1111 1111 1111

214h SSP1STAT SMP CKE D/A

215h SSP1CON1 WCOL SSPOV SSPEN CKP SSPM<3:0> 0000 0000 0000 0000

216h SSP1CON2 GCEN ACKSTAT ACKDT ACKEN RCEN PEN RSEN SEN 0000 0000 0000 0000

217h SSP1CON3 ACKTIM PCIE SCIE BOEN SDAHT SBCDE AHEN DHEN 0000 0000 0000 0000

218h

— Unimplemented — —

21Fh

PSR/WUA BF 0000 0000 0000 0000

Value o n

POR, BOR

Bank 5

28Ch

— Unimplemented — —

29Fh

Bank 6

30Ch

— Unimplemented — —

31Fh

Bank 7

38Ch

— Unimplemented — —

390h

391h IOCAP

392h IOCAN

393h IOCAF

394h

— Unimplemented — —

39Fh

— — IOCAP5 IOCAP4 IOCAP3

— — IOCAN5 IOCAN4 IOCAN3

— — IOCAF5 IOCAF4 IOCAF3

IOCAP2 IOCAP1 IOCAP0

IOCAN2 IOCAN1 IOCAN0

IOCAF2 IOCAF1 IOCAF0

--00 0000 --00 0000

Bank 8

40Ch

— Unimplemented — —

41Fh

Bank 9

48Ch

— Unimplemented — —

497h

498h NCO1ACCL NCO1ACC<7:0> 0000 0000 0000 0000

499h NCO1ACCH NCO1ACC<15:8> 0000 0000 0000 0000

49Ah NCO1ACCU NCO1ACC<19:16> 0000 0000 0000 0000

49Bh NCO1INCL NCO1INC<7:0> 0000 0000 0000 0000

49Ch NCO1INCH NCO1INC<15:8> 0000 0000 0000 0000

49Dh

49Eh NCO1CON N1EN N1OE N1OUT N1POL

49Fh NCO1CLK N1PWS<2:0>

Legend: x = unknown, u = unchanged, q = value depends on condition, - = unimplemented, r = reserved. Shaded locations are unimplemented, read as ‘0’. Note 1: PIC16F1503 only.

— Unimplemented — —

— — —N1PFM0000 ---0 0000 ---0

— — —N1CKS<1:0>0000 --00 0000 --00

2: Unimplemented, read as ‘1’.

Value on all

other

Resets

DS40001607C-page 26  2011-2014 Microchip Technology Inc.

PIC16(L)F1503

TABLE 3-5: SPECIAL FUNCTION REGISTER SUMMARY (CONTINUED)

Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

Bank 10

50Ch

— Unimplemented — —

51Fh

Value o n

POR, BOR

Bank 11

58Ch

— Unimplemented — —

59Fh

Bank 12

60Ch

— Unimplemented — —

610h

611h PWM1DCL PWM1DCL<7:6>

612h PWM1DCH PWM1DCH<7:0> xxxx xxxx uuuu uuuu

613h PWM1CON0 PWM1EN PWM1OE PWM1OUT PWM1POL

614h PWM2DCL PWM2DCL<7:6>

615h PWM2DCH PWM2DCH<7:0> xxxx xxxx uuuu uuuu

616h PWM2CON0 PWM2EN PWM2OE PWM2OUT PWM2POL

617h PWM3DCL PWM3DCL<7:6>

618h PWM3DCH PWM3DCH<7:0> xxxx xxxx uuuu uuuu

619h PWM3CON0 PWM3EN PWM3OE PWM3OUT PWM3POL

61Ah PWM4DCL PWM4DCL<7:6>

61Bh PWM4DCH PWM4DCH<7:0> xxxx xxxx uuuu uuuu

61Ch PWM4CON0 PWM4EN PWM4OE PWM4OUT PWM4POL

61Dh

— Unimplemented — —

61Fh

— — — — — — 00-- ---- 00-- ----

— — — — 0000 ---- 0000 ----

— — — — — — 00-- ---- 00-- ----

— — — — 0000 ---- 0000 ----

— — — — — — 00-- ---- 00-- ----

— — — — 0000 ---- 0000 ----

— — — — — — 00-- ---- 00-- ----

— — — — 0000 ---- 0000 ----

Bank 13

68Ch

— Unimplemented — —

690h

691h CWG1DBR

692h CWG1DBF

693h CWG1CON0 G1EN G1OEB G1OEA G1POLB G1POLA

694h CWG1CON1 G1ASDLB<1:0> G1ASDLA<1:0>

695h CWG1CON2 G1ASE G1ARSEN

696h

— Unimplemented — —

69Fh

Legend: x = unknown, u = unchanged, q = value depends on condition, - = unimplemented, r = reserved. Shaded locations are unimplemented, read as ‘0’. Note 1: PIC16F1503 only.

2: Unimplemented, read as ‘1’.

— —CWG1DBR<5:0>--00 0000 --00 0000

— —CWG1DBF<5:0>--xx xxxx --xx xxxx

— —G1CS00000 0--0 0000 0--0

— G1IS<2:0> 0000 -000 0000 -000

— — G1ASDC2 G1ASDC1 G1ASDSFLT G1ASDSCLC2 00-- 0000 00-- 0000

Value on all

other

Resets

 2011-2014 Microchip Technology Inc. DS40001607C-page 27

PIC16(L)F1503

TABLE 3-5: SPECIAL FUNCTION REGISTER SUMMARY (CONTINUED)

Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

Value o n

POR, BOR

Banks 14-29

x0Ch/ x8Ch — x1Fh/ x9Fh

— Unimplemented — —

Bank 30

F0Ch

— Unimplemented — —

F0Eh

F0Fh CLCDATA

F10h CLC1CON LC1EN LC1OE LC1OUT LC1INTP LC1INTN LC1MODE<2:0> 0000 0000 0000 0000

F11h CLC1POL LC1POL

F12h CLC1SEL0

F13h CLC1SEL1

F14h CLC1GLS0 LC1G1D4T LC1G1D4N LC1G1D3T LC1G1D3N LC1G1D2T LC1G1D2N LC1G1D1T LC1G1D1N xxxx xxxx uuuu uuuu

F15h CLC1GLS1 LC1G2D4T LC1G2D4N LC1G2D3T LC1G2D3N LC1G2D2T LC1G2D2N LC1G2D1T LC1G2D1N xxxx xxxx uuuu uuuu

F16h CLC1GLS2 LC1G3D4T LC1G3D4N LC1G3D3T LC1G3D3N LC1G3D2T LC1G3D2N LC1G3D1T LC1G3D1N xxxx xxxx uuuu uuuu

F17h CLC1GLS3 LC1G4D4T LC1G4D4N LC1G4D3T LC1G4D3N LC1G4D2T LC1G4D2N LC1G4D1T LC1G4D1N xxxx xxxx uuuu uuuu

F18h CLC2CON LC2EN LC2OE LC2OUT LC2INTP LC2INTN LC2MODE<2:0> 0000 0000 0000 0000

F19h CLC2POL LC2POL

F1Ah CLC2SEL0

F1Bh CLC2SEL1

F1Ch CLC2GLS0 LC2G1D4T LC2G1D4N LC2G1D3T LC2G1D3N LC2G1D2T LC2G1D2N LC2G1D1T LC2G1D1N xxxx xxxx uuuu uuuu

F1Dh CLC2GLS1 LC2G2D4T LC2G2D4N LC2G2D3T LC2G2D3N LC2G2D2T LC2G2D2N LC2G2D1T LC2G2D1N xxxx xxxx uuuu uuuu

F1Eh CLC2GLS2 LC2G3D4T LC2G3D4N LC2G3D3T LC2G3D3N LC2G3D2T LC2G3D2N LC2G3D1T LC2G3D1N xxxx xxxx uuuu uuuu

F1Fh CLC2GLS3 LC2G4D4T LC2G4D4N LC2G4D3T LC2G4D3N LC2G4D2T LC2G4D2N LC2G4D1T LC2G4D1N xxxx xxxx uuuu uuuu

F20h

— Unimplemented — —

F6Fh

Legend: x = unknown, u = unchanged, q = value depends on condition, - = unimplemented, r = reserved. Shaded locations are unimplemented, read as ‘0’. Note 1: PIC16F1503 only.

2: Unimplemented, read as ‘1’.

— — — — — — MLC2OUT MLC1OUT ---- --00 ---- --00

— — — LC1G4POL LC1G3POL LC1G2POL LC1G1POL 0--- xxxx 0--- uuuu

— LC1D2S<2:0> — LC1D1S<2:0> -xxx -xxx -uuu -uuu

— LC1D4S<2:0> — LC1D3S<2:0> -xxx -xxx -uuu -uuu

— — — LC2G4POL LC2G3POL LC2G2POL LC2G1POL 0--- xxxx 0--- uuuu

— LC2D2S<2:0> — LC2D1S<2:0> -xxx -xxx -uuu -uuu

— LC2D4S<2:0> — LC2D3S<2:0> -xxx -xxx -uuu -uuu

Value on all

other

Resets

DS40001607C-page 28  2011-2014 Microchip Technology Inc.

PIC16(L)F1503

TABLE 3-5: SPECIAL FUNCTION REGISTER SUMMARY (CONTINUED)

Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

Bank 31

F8Ch — FE3h

FE4h STATUS_

FE5h WREG_

FE6h BSR_

FE7h PCLATH_

FE8h FSR0L_

FE9h FSR0H_

FEAh FSR1L_

FEBh FSR1H_

FECh

FEDh

FEEh

FEFh

Legend: x = unknown, u = unchanged, q = value depends on condition, - = unimplemented, r = reserved. Shaded locations are unimplemented, read as ‘0’. Note 1: PIC16F1503 only.

— Unimplemented — —

— — — — — Z_SHAD DC_SHAD C_SHAD ---- -xxx ---- -uuu

SHAD

Working Register Shadow xxxx xxxx uuuu uuuu

SHAD

— — — Bank Select Register Shadow ---x xxxx ---u uuuu

SHAD

— Program Counter Latch High Register Shadow -xxx xxxx uuuu uuuu

SHAD

Indirect Data Memory Address 0 Low Pointer Shadow xxxx xxxx uuuu uuuu

SHAD

Indirect Data Memory Address 0 High Pointer Shadow xxxx xxxx uuuu uuuu

SHAD

Indirect Data Memory Address 1 Low Pointer Shadow xxxx xxxx uuuu uuuu

SHAD

Indirect Data Memory Address 1 High Pointer Shadow xxxx xxxx uuuu uuuu

SHAD

— Unimplemented — —

STKPTR

TOSL

TOSH

2: Unimplemented, read as ‘1’.

— — — Current Stack Pointer ---1 1111 ---1 1111

Top-of-Stack Low byte xxxx xxxx uuuu uuuu

— Top-of-Stack High byte -xxx xxxx -uuu uuuu

Value o n

POR, BOR

Value on all

other

Resets

 2011-2014 Microchip Technology Inc. DS40001607C-page 29

PIC16(L)F1503

014

PCL

PCH

PCLATH

Instruction

with PCL as

Destination

GOTO,

CALL

CALLW

BRW

BRA

ALU result

OPCODE <10:0>

PC + W

PC + OPCODE <8:0>

Rev. 10-000042A

7/30/2013

3.3 PCL and PCLATH

The Program Counter (PC) is 15 bits wide. The low byte comes from the PCL register, which is a readable and writable register. The high byte (PC<14:8>) is not directly readable or writable and comes from PCLATH. On any Reset, the PC is cleared. Figure 3-3 shows the five situations for the loading of the PC.

FIGURE 3-3: LOADING OF PC IN

DIFFERENT SITUATIONS

3.3.1 MODIFYING PCL

Executing any instruction with the PCL register as the destination simultaneously causes the Program Counter PC<14:8> bits (PCH) to be replaced by the contents of the PCLATH register. This allows the entire contents of the program counter to be changed by writing the desired upper seven bits to the PCLATH register. When the lower eight bits are written to the PCL register, all 15 bits of the program counter will change to the values contained in the PCLATH register and those being written to the PCL register.

3.3.2 COMPUTED GOTO

A computed GOTO is accomplished by adding an offset to the program counter (ADDWF PCL). When performing a table read using a computed GOTO method, care should be exercised if the table location crosses a PCL memory boundary (each 256-byte block). Refer to Application Note AN556, “Implementing a Table Read” (DS00556).

3.3.3 COMPUTED FUNCTION CALLS

A computed function CALL allows programs to maintain tables of functions and provide another way to execute state machines or look-up tables. When performing a table read using a computed function CALL, care should be exercised if the table location crosses a PCL memory boundary (each 256-byte block).

If using the CALL instruction, the PCH<2:0> and PCL registers are loaded with the operand of the CALL instruction. PCH<6:3> is loaded with PCLATH<6:3>.

The CALLW instruction enables computed calls by combining PCLATH and W to form the destination address. A computed CALLW is accomplished by loading the W register with the desired address and executing CALLW. The PCL register is loaded with the value of W and PCH is loaded with PCLATH.

3.3.4 BRANCHING

The branching instructions add an offset to the PC. This allows relocatable code and code that crosses page boundaries. There are two forms of branching, BRW and BRA. The PC will have incremented to fetch the next instruction in both cases. When using either branching instruction, a PCL memory boundary may be crossed.

If using BRW, load the W register with the desired unsigned address and execute BRW. The entire PC will be loaded with the address PC + 1 + W.

If using BRA, the entire PC will be loaded with PC + 1 +, the signed value of the operand of the BRA instruction.

DS40001607C-page 30  2011-2014 Microchip Technology Inc.

PIC16(L)F1503

STKPTR = 0x1F

Stack Reset Disabled (STVREN = 0)

Stack Reset Enabled (STVREN = 1)

Initial Stack Configuration:

After Reset, the stack is empty. The empty stack is initialized so the Stack Pointer is pointing at 0x1F. If the Stack Overflow/Underflow Reset is enabled, the TOSH/TOSL register will return ‘0’.Ifthe Stack Overflow/Underflow Reset is disabled, the TOSH/TOSL register will return the contents of stack address 0x0F.

0x0000

STKPTR = 0x1F

TOSH:TOSL 0x0F

0x0E

0x0D

0x0C

0x0B

0x0A

0x09

0x08

0x07

0x06

0x04

0x05

0x03

0x02

0x01

0x00

0x1F

TOSH:TOSL

Rev. 10-000043A

7/30/2013

3.4 Stack

All devices have a 16-level x 15-bit wide hardware stack (refer to Figures 3-4 through 3-7). The stack space is not part of either program or data space. The PC is PUSHed onto the stack when CALL or CALLW instructions are executed or an interrupt causes a branch. The stack is POPed in the event of a RETURN, RETLW or a RETFIE instruction execution. PCLATH is not affected by a PUSH or POP operation.

The stack operates as a circular buffer if the STVREN bit is programmed to ‘0‘ (Configuration Words). This means that after the stack has been PUSHed sixteen times, the seventeenth PUSH overwrites the value that was stored from the first PUSH. The eighteenth PUSH overwrites the second PUSH (and so on). The STKOVF and STKUNF flag bits will be set on an Overflow/Underflow, regardless of whether the Reset is enabled.

Note 1: There are no instructions/mnemonics

called PUSH or POP. These are actions that occur from the execution of the

CALL, CALLW, RETURN, RETLW and RETFIE instructions or the vectoring to

an interrupt address.

3.4.1 ACCESSING THE STACK

The stack is available through the TOSH, TOSL and STKPTR registers. STKPTR is the current value of the Stack Pointer. TOSH:TOSL register pair points to the TOP of the stack. Both registers are read/writable. TOS is split into TOSH and TOSL due to the 15-bit size of the PC. To access the stack, adjust the value of STKPTR, which will position TOSH:TOSL, then read/write to TOSH:TOSL. STKPTR is 5 bits to allow detection of overflow and underflow.

Note: Care should be taken when modifying the

STKPTR while interrupts are enabled.

During normal program operation, CALL, CALLW and Interrupts will increment STKPTR while RETLW, RETURN, and RETFIE will decrement STKPTR. At any time STKPTR can be inspected to see how much stack is left. The STKPTR always points at the currently used place on the stack. Therefore, a CALL or CALLW will increment the STKPTR and then write the PC, and a return will unload the PC and then decrement the STKPTR.

Reference Figure 3-4 through Figure 3-7 for examples of accessing the stack.

FIGURE 3-4: ACCESSING THE STACK EXAMPLE 1

 2011-2014 Microchip Technology Inc. DS40001607C-page 31

PIC16(L)F1503

STKPTR = 0x00

Return Address

This figure shows the stack configuration after the first CALL or a single interrupt. If a RETURN instruction is executed, the return address will be placed in the Program Counter and the Stack Pointer decremented to the empty state (0x1F).

0x0F

0x0E

0x0D

0x0C

0x0B

0x0A

0x09

0x08

0x07

0x06

0x04

0x05

0x03

0x02

0x01

0x00

TOSH:TOSL

Rev. 10-000043B

7/30/2013

STKPTR = 0x06

After seven CALLsorsixCALLs and an interrupt, the stack looks like the figure on the left. A series of RETURN instructions will repeatedly place the return addresses into the Program Counter and pop the stack.

Return Address

0x0F

0x0E

0x0D

0x0C

0x0B

0x0A

0x09

0x08

0x07

0x06

0x04

0x05

0x03

0x02

0x01

0x00

Return Address

TOSH:TOSL

Rev. 10-000043C

7/30/2013

FIGURE 3-5: ACCESSING THE STACK EXAMPLE 2

FIGURE 3-6: ACCESSING THE STACK EXAMPLE 3

DS40001607C-page 32  2011-2014 Microchip Technology Inc.

FIGURE 3-7: ACCESSING THE STACK EXAMPLE 4

STKPTR = 0x10

When the stack is full, the next CALL or an interrupt will set the Stack Pointer to 0x10. This is identical to address 0x00 so the stack will wrap and overwrite the return address at 0x00. If the Stack Overflow/Underflow Reset is enabled, a Reset will occur and location 0x00 will not be overwritten.

Return Address0x0F

0x0E

0x0D

0x0C

0x0B

0x0A

0x09

0x08

0x07

0x06

0x04

0x05

0x03

0x02

0x01

0x00

Return Address

TOSH:TOSL

Rev. 10-000043D

7/30/2013

PIC16(L)F1503

3.4.2 OVERFLOW/UNDERFLOW RESET

If the STVREN bit in Configuration Words is programmed to ‘1’, the device will be reset if the stack is PUSHed beyond the sixteenth level or POPed beyond the first level, setting the appropriate bits (STKOVF or STKUNF, respectively) in the PCON register.

3.5 Indirect Addressing

The INDFn registers are not physical registers. Any instruction that accesses an INDFn register actually accesses the register at the address specified by the File Select Registers (FSR). If the FSRn address specifies one of the two INDFn registers, the read will return ‘0’ and the write will not occur (though Status bits may be affected). The FSRn register value is created by the pair FSRnH and FSRnL.

The FSR registers form a 16-bit address that allows an addressing space with 65536 locations. These locations are divided into three memory regions:

• Traditional Data Memory

• Linear Data Memory

• Program Flash Memory

 2011-2014 Microchip Technology Inc. DS40001607C-page 33

PIC16(L)F1503

0x0000

0x0FFF

0x0000

0x7FFF0xFFFF

0x0000

0x0FFF

0x1000

0x1FFF

0x2000

0x29AF 0x29B0

0x7FFF

0x8000

Reserved

Traditional

Data Memory

Linear

Data Memory

Program

Flash Memory

FSR

Address

Range

Note: Not all memory regions are completely implemented. Consult device memory tables for memory limits.

Rev. 10-000044A

7/30/2013

FIGURE 3-8: INDIRECT ADDRESSING

DS40001607C-page 34  2011-2014 Microchip Technology Inc.

3.5.1 TRADITIONAL DATA MEMORY

Direct Addressing

40BSR 60

From Opcode

07FSRxH

000

07FSRxL

Indirect Addressing

00000 00001 00010 11111

Bank Select Location Select

0x00

0x7F

Bank Select Location Select

Bank 0 Bank 1 Bank 2

Bank 31

Rev. 10-000056A

7/31/2013

The traditional data memory is a region from FSR address 0x000 to FSR address 0xFFF. The addresses correspond to the absolute addresses of all SFR, GPR and common registers.

FIGURE 3-9: TRADITIONAL DATA MEMORY MAP

PIC16(L)F1503

 2011-2014 Microchip Technology Inc. DS40001607C-page 35

PIC16(L)F1503

0x020 Bank 0 0x06F

0x0A0 Bank 1 0x0EF

0x120 Bank 2 0x16F

0xF20

Bank 30

0xF6F

001

0077FSRnH FSRnL

Location Select

0x2000

0x29AF

Rev. 10-000057A

7/31/2013

0x0000

Program

Flash

Memory

(low 8 bits)

0x7FFF

0077FSRnH FSRnL

Location Select

0x8000

0xFFFF

Rev. 10-000058A

7/31/2013

3.5.2 LINEAR DATA MEMORY

The linear data memory is the region from FSR address 0x2000 to FSR address 0x29AF. This region is a virtual region that points back to the 80-byte blocks of GPR memory in all the banks.

Unimplemented memory reads as 0x00. Use of the linear data memory region allows buffers to be larger than 80 bytes because incrementing the FSR beyond one bank will go directly to the GPR memory of the next bank.

The 16 bytes of common memory are not included in the linear data memory region.

FIGURE 3-10: LINEAR DATA MEMORY

MAP

3.5.3 PROGRAM FLASH MEMORY

To make constant data access easier, the entire program Flash memory is mapped to the upper half of the FSR address space. When the MSb of FSRnH is set, the lower 15 bits are the address in program memory which will be accessed through INDF. Only the lower eight bits of each memory location is accessible via INDF. Writing to the program Flash memory cannot be accomplished via the FSR/INDF interface. All instructions that access program Flash memory via the FSR/INDF interface will require one additional instruction cycle to complete.

FIGURE 3-11: PROGRAM FLASH

MEMORY MAP

DS40001607C-page 36  2011-2014 Microchip Technology Inc.

4.0 DEVICE CONFIGURATION

Device configuration consists of Configuration Words, Code Protection and Device ID.

4.1 Configuration Words

There are several Configuration Word bits that allow different oscillator and memory protection options. These are implemented as Configuration Word 1 at 8007h and Configuration Word 2 at 8008h.

Note: The DEBUG bit in Configuration Words is

managed automatically by device development tools including debuggers and programmers. For normal device operation, this bit should be maintained as a ‘1’.

PIC16(L)F1503

 2011-2014 Microchip Technology Inc. DS40001607C-page 37

PIC16(L)F1503

4.2 Register Definitions: Configuration Words

REGISTER 4-1: CONFIG1: CONFIGURATION WORD 1

U-1 U-1 R/P-1 R/P-1 R/P-1 U-1

— —

bit 13 bit 8

R/P-1 R/P-1 R/P-1 R/P-1 R/P-1 U-1 R/P-1 R/P-1

(2)

bit 7 bit 0

Legend:

R = Readable bit P = Programmable bit U = Unimplemented bit, read as ‘1’ ‘0’ = Bit is cleared ‘1’ = Bit is set -n = Value when blank or after Bulk Erase

bit 13-12 Unimplemented: Read as ‘1’ bit 11 CLKOUTEN

bit 10-9 BOREN<1:0>: Brown-Out Reset Enable bits

bit 8 Unimplemented: Read as ‘1’ bit 7 CP

bit 6 MCLRE: MCLR

bit 5 PWRTE

bit 4-3 WDTE<1:0>: Watchdog Timer Enable bits

bit 2 Unimplemented: Read as ‘1’ bit 1-0 FOSC<1:0>: Oscillator Selection bits

MCLRE PWRTE WDTE<1:0> — FOSC<1:0>

: Clock Out Enable bit

1 = CLKOUT function is disabled. I/O function on the CLKOUT pin 0 = CLKOUT function is enabled on the CLKOUT pin

11 = BOR enabled 10 = BOR enabled during operation and disabled in Sleep 01 = BOR controlled by SBOREN bit of the BORCON register 00 = BOR disabled

: Code Protection bit

1 = Program memory code protection is disabled 0 = Program memory code protection is enabled

/VPP Pin Function Select bit

If LVP bit =

This bit is ignored.

If LVP bit = 0:

1 =MCLR 0 =MCLR

1 = PWRT disabled 0 = PWRT enabled

11 = WDT enabled 10 = WDT enabled while running and disabled in Sleep 01 = WDT controlled by the SWDTEN bit in the WDTCON register 00 = WDT disabled

11 = ECH: External Clock, High-Power mode: on CLKIN pin 10 = ECM: External Clock, Medium-Power mode: on CLKIN pin 01 = ECL: External Clock, Low-Power mode: on CLKIN pin 00 = INTOSC oscillator: I/O function on CLKIN pin

/VPP pin function is MCLR; Weak pull-up enabled. /VPP pin function is digital input; MCLR internally disabled; Weak pull-up under control of

WPUA3 bit.

: Power-Up Timer Enable bit

(2)

CLKOUTEN

(1)

BOREN<1:0>

(1)

—

Note 1: Enabling Brown-out Reset does not automatically enable Power-up Timer.

2: Once enabled, code-protect can only be disabled by bulk erasing the device.

DS40001607C-page 38  2011-2014 Microchip Technology Inc.

PIC16(L)F1503

REGISTER 4-2: CONFIG2: CONFIGURATION WORD 2

R/P-1 U-1 R/P-1 R/P-1 R/P-1 U-1

(1)

LVP

bit 13 bit 8

U-1 U-1 U-1 U-1 U-1 U-1 R/P-1 R/P-1

— —

bit 7 bit 0

Legend:

R = Readable bit P = Programmable bit U = Unimplemented bit, read as ‘1’ ‘0’ = Bit is cleared ‘1’ = Bit is set -n = Value when blank or after Bulk Erase

— —

—LPBORBORV

— —WRT<1:0>

(2)

STVREN —

bit 13 LVP: Low-Voltage Programming Enable bit

1 = Low-voltage programming enabled 0 = High-voltage on MCLR

bit 12 Unimplemented: Read as ‘1’ bit 11

bit 10 BORV: Brown-Out Reset Voltage Selection bit

bit 9 STVREN: Stack Overflow/Underflow Reset Enable bit

bit 8-2 Unimplemented: Read as ‘1’ bit 1-0 WRT<1:0>: Flash Memory Self-Write Protection bits

Note 1: The LVP bit cannot be programmed to ‘0’ when Programming mode is entered via LVP.

2: See VBOR parameter for specific trip point voltages.

LPBOR

1 = Low-Power Brown-out Reset is disabled 0 = Low-Power Brown-out Reset is enabled

1 = Brown-out Reset voltage (VBOR), low trip point selected 0 = Brown-out Reset voltage (V

1 = Stack Overflow or Underflow will cause a Reset 0 = Stack Overflow or Underflow will not cause a Reset

2 kW Flash memory

: Low-Power BOR Enable bit

11 = Write protection off 10 = 000h to 1FFh write-protected, 200h to 7FFh may be modified 01 = 000h to 3FFh write-protected, 400h to 7FFh may be modified 00 = 000h to 7FFh write-protected, no addresses may be modified

must be used for programming

BOR), high trip point selected

(PIC16(L)F1503 only):

(1)

(2)

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PIC16(L)F1503

4.3 Code Protection

Code protection allows the device to be protected from unauthorized access. Internal access to the program memory is unaffected by any code protection setting.

4.3.1 PROGRAM MEMORY PROTECTION

The entire program memory space is protected from external reads and writes by the CP Words. When CP program memory are inhibited and a read will return all ‘0’s. The CPU can continue to read program memory, regardless of the protection bit settings. Writing the program memory is dependent upon the write protection setting. See Section 4.4 “Write

Protection” for more information.

= 0, external reads and writes of

4.4 Write Protection

Write protection allows the device to be protected from unintended self-writes. Applications, such as bootloader software, can be protected while allowing other regions of the program memory to be modified.

The WRT<1:0> bits in Configuration Words define the size of the program memory block that is protected.

bit in Configuration

4.5 User ID

Four memory locations (8000h-8003h) are designated as ID locations where the user can store checksum or other code identification numbers. These locations are readable and writable during normal execution. See

Section 10.4 “User ID, Device ID and Configuration Word Access” for more information on accessing these

memory locations. calculation, see the “PIC12(L)F1501/PIC16(L)F150X

Memory Programming Specification” (DS41573).

For more information on checksum

DS40001607C-page 40  2011-2014 Microchip Technology Inc.

PIC16(L)F1503

Device

DEVID<13:0> Values

DEV<8:0> REV<4:0>

PIC16LF1503 10 1101 101 x xxxx

PIC16F1503 10 1100 111 x xxxx

4.6 Device ID and Revision ID

The memory location 8006h is where the Device ID and Revision ID are stored. The upper nine bits hold the Device ID. The lower five bits hold the Revision ID. See

Section 10.4 “User ID, Device ID and Configuration Word Access” for more information on accessing

these memory locations.

Development tools, such as device programmers and debuggers, may be used to read the Device ID and Revision ID.

4.7 Register Definitions: Device ID

REGISTER 4-3: DEVID: DEVICE ID REGISTER

RRRRRR

DEV<8:3>

bit 13 bit 8

RRRRRRRR

DEV<2:0> REV<4:0>

bit 7 bit 0

Legend:

R = Readable bit

‘1’ = Bit is set ‘0’ = Bit is cleared

bit 13-5 DEV<8:0>: Device ID bits

bit 4-0 REV<4:0>: Revision ID bits

These bits are used to identify the revision (see Table under DEV<8:0> above).

 2011-2014 Microchip Technology Inc. DS40001607C-page 41

PIC16(L)F1503

5.0 OSCILLATOR MODULE

5.1 Overview

The oscillator module has a wide variety of clock sources and selection features that allow it to be used in a wide range of applications while maximizing performance and minimizing power consumption. Figure 5-1 illustrates a block diagram of the oscillator module.

Clock sources can be supplied from an external clock or from one of two internal oscillators, with a choice of speeds selectable via software. Additional clock features include:

• Selectable system clock source between external or internal sources via software.

• Fast start-up oscillator allows internal circuits to power-up and stabilize before switching to the 16 MHz HFINTOSC

The oscillator module can be configured in one of the following clock modes.

1. ECL – External Clock Low-Power mode (0 MHz to 0.5 MHz)

2. ECM – External Clock Medium-Power mode (0.5 MHz to 4 MHz)

3. ECH – External Clock High-Power mode (4 MHz to 20 MHz)

4. INTOSC – Internal oscillator (31 kHz to 16 MHz)

Clock Source modes are selected by the FOSC<1:0> bits in the Configuration Words. The FOSC bits determine the type of oscillator that will be used when the device is first powered.

The ECH, ECM, and ECL clock modes rely on an external logic level signal as the device clock source.

The INTOSC internal oscillator block produces a low and high-frequency clock source, designated LFINTOSC and HFINTOSC. (See Internal Oscillator Block, Figure 5-1). A wide selection of device clock frequencies may be derived from these two clock sources.

DS40001607C-page 42  2011-2014 Microchip Technology Inc.

PIC16(L)F1503

g p yp g

Start-up

Control Logic

16 MHz

Oscillator

Fast Start-up

Oscillator

31 kHz

Oscillator

Prescaler

HFINTOSC

(1)

16 MHz

8MHz

4MHz

2MHz

1MHz

*500 kHz

*250 kHz

*125 kHz

62.5 kHz

*31.25 kHz

*31 kHz

IRCF<3:0>

INTOSC

HFINTOSC

LFINTOSC

to CPU and

Peripherals

Sleep

FOSC

(1)

LFINTOSC

(1)

to WDT, PWRT, and

other Peripherals

* Available with more than one IRCF selection

Clock

Control

FOSC<2:0> SCS<1:0>

600 kHz

Oscillator

FRC

(1)

to ADC and

other Peripherals

Rev. 10-000030C

7/30/2013

CLKIN

(2)

Note 1: See Section 5.2.2.4 “Peripheral Clock Sources”.

2: ST buffer is high-speed type when using T1CKI.

FIGURE 5-1: SIMPLIFIED PIC® MCU CLOCK SOURCE BLOCK DIAGRAM

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PIC16(L)F1503

Clock from Ext. system

FOSC/4 or I/O

(1)

OSC1/CLKIN

PIC

MCU

OSC2/CLKOUT

Note 1: Output depends upon the CLKOUTEN bit

of the Configuration Words.

Rev. 10-000045A

7/30/2013

5.2 Clock Source Types

Clock sources can be classified as external, internal or peripheral.

External clock sources rely on external circuitry for the clock source to function. Examples are: oscillator modules (ECH, ECM, ECL modes).

Internal clock sources are contained within the oscillator module. The internal oscillator block has two internal oscillators that are used to generate the internal system clock sources: the 16 MHz High-Frequency Internal Oscillator (HFINTOSC) and the 31 kHz Low-Frequency Internal Oscillator (LFINTOSC).

The peripheral clock source is a nominal 600 kHz internal RC oscillator, FRC. The FRC is traditionally used with the ADC module, but is sometimes available to other peripherals. See Section 5.2.2.4 “Peripheral

Clock Sources”.

The system clock can be selected between external or internal clock sources via the System Clock Select (SCS) bits in the OSCCON register. See Section 5.3

“Clock Switching” for additional information.

5.2.1 EXTERNAL CLOCK SOURCES

An external clock source can be used as the device system clock by performing one of the following actions:

• Program the FOSC<1:0> bits in the Configuration Words to select an external clock source that will be used as the default system clock upon a device Reset.

• Write the SCS<1:0> bits in the OSCCON register to switch the system clock source to:

- Secondary oscillator during run-time, or

- An external clock source determined by the

value of the FOSC bits.

See Section 5.3 “Clock Switching” for more informa- tion.

FIGURE 5-2: EXTERNAL CLOCK (EC)

MODE OPERATION

5.2.1.1 EC Mode

The External Clock (EC) mode allows an externally generated logic level signal to be the system clock source. When operating in this mode, an external clock source is connected to the OSC1 input. OSC2/CLKOUT is available for general purpose I/O or CLKOUT. Figure 5-2 shows the pin connections for EC mode.

EC mode has three power modes to select from through

OSC bits in the Configuration Words:

the F

• ECH – High-power, 4-20 MHz

• ECM – Medium-power, 0.5-4 MHz

• ECL – Low-power, 0-0.5 MHz

DS40001607C-page 44  2011-2014 Microchip Technology Inc.

PIC16(L)F1503

5.2.2 INTERNAL CLOCK SOURCES

The device may be configured to use the internal oscillator block as the system clock by performing one of the following actions:

• Program the FOSC<1:0> bits in Configuration Words to select the INTOSC clock source, which will be used as the default system clock upon a device Reset.

• Write the SCS<1:0> bits in the OSCCON register to switch the system clock source to the internal oscillator during run-time. See Section 5.3

“Clock Switching”for more information.

In INTOSC mode, CLKIN is available for general purpose I/O. CLKOUT is available for general purpose I/O or CLKOUT.

The function of the CLKOUT pin is determined by the CLKOUTEN

The internal oscillator block has two independent oscillators that provides the internal system clock source.

1. The HFINTOSC (High-Frequency Internal

Oscillator) is factory calibrated and operates at 16 MHz.

2. The LFINTOSC (Low-Frequency Internal

Oscillator) operates at 31 kHz.

bit in Configuration Words.

5.2.2.1 HFINTOSC

The High-Frequency Internal Oscillator (HFINTOSC) is a factory calibrated 16 MHz internal clock source.

The output of the HFINTOSC connects to a postscaler and multiplexer (see Figure 5-1). The frequency derived from the HFINTOSC can be selected via software using the IRCF<3:0> bits of the OSCCON register. See

Section 5.2.2.6 “Internal Oscillator Clock Switch Timing” for more information.

The HFINTOSC is enabled by:

• Configure the IRCF<3:0> bits of the OSCCON register for the desired HF frequency, and

•FOSC<1:0> = 00, or

• Set the System Clock Source (SCS) bits of the OSCCON register to ‘1x’.

A fast start-up oscillator allows internal circuits to power-up and stabilize before switching to HFINTOSC.

The High-Frequency Internal Oscillator Ready bit (HFIOFR) of the OSCSTAT register indicates when the HFINTOSC is running.

The High-Frequency Internal Oscillator Stable bit (HFIOFS) of the OSCSTAT register indicates when the HFINTOSC is running within 0.5% of its final value.

5.2.2.2 LFINTOSC

The Low-Frequency Internal Oscillator (LFINTOSC) is a 31 kHz internal clock source.

The output of the LFINTOSC connects to a multiplexer (see Figure 5-1). Select 31 kHz, via software, using the IRCF<3:0> bits of the OSCCON register. See

Section 5.2.2.6 “Internal Oscillator Clock Switch Timing” for more information. The LFINTOSC is also

the frequency for the Power-up Timer (PWRT) and the, Watchdog Timer (WDT).

The LFINTOSC is enabled by selecting 31 kHz (IRCF<3:0> bits of the OSCCON register = 000) as the system clock source (SCS bits of the OSCCON register = 1x), or when any of the following are enabled:

• Configure the IRCF<3:0> bits of the OSCCON register for the desired LF frequency, and

•FOSC<1:0> = 00, or

• Set the System Clock Source (SCS) bits of the OSCCON register to ‘1x’.

Peripherals that use the LFINTOSC are:

• Power-up Timer (PWRT)

• Watchdog Timer (WDT)

The Low-Frequency Internal Oscillator Ready bit (LFIOFR) of the OSCSTAT register indicates when the LFINTOSC is running.

5.2.2.3 FRC

The FRC clock is an uncalibrated, nominal 600 kHz peripheral clock source.

The FRC is automatically turned on by the peripherals requesting the FRC clock.

The FRC clock continues to run during Sleep.

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PIC16(L)F1503

5.2.2.4 Peripheral Clock Sources

The clock sources described in this chapter and the Timer’s are available to different peripherals. Table 5-1 lists the clocks and timers available for each peripheral.

TABLE 5-1: PERIPHERAL CLOCK

SOURCES

FRC

FOSC

HFINTOSC

ADC ●●

CLC ●●●●●●●

COMP ●

CWG ●●

MSSP ●●

NCO ●●

PWM ●●

PWRT ●

TMR0 ● TMR1 ●● TMR2 ●

WDT ●

TMR0

TMR1

TMR2

LFINTOSC

5.2.2.5 Internal Oscillator Frequency Selection

The system clock speed can be selected via software using the Internal Oscillator Frequency Select bits IRCF<3:0> of the OSCCON register.

The postscaled output of the 16 MHz HFINTOSC and 31 kHz LFINTOSC connect to a multiplexer (see

Figure 5-1). The Internal Oscillator Frequency Select

bits IRCF<3:0> of the OSCCON register (Register 5-1) select the frequency output of the internal oscillators.

Note: Following any Reset, the IRCF<3:0> bits

of the OSCCON register are set to ‘0111’ and the frequency selection is set to 500 kHz. The user can modify the IRCF bits to select a different frequency.

The IRCF<3:0> bits of the OSCCON register allow duplicate selections for some frequencies. These duplicate choices can offer system design trade-offs. Lower power consumption can be obtained when changing oscillator sources for a given frequency. Faster transition times can be obtained between frequency changes that use the same oscillator source.

5.2.2.6 Internal Oscillator Clock Switch Timing

When switching between the HFINTOSC and the LFINTOSC, the new oscillator may already be shut down to save power (see Figure 5-3). If this is the case, there is a delay after the IRCF<3:0> bits of the OSCCON register are modified before the frequency selection takes place. The OSCSTAT register will reflect the current active status of the HFINTOSC and LFINTOSC oscillators. The sequence of a frequency selection is as follows:

1. IRCF<3:0> bits of the OSCCON register are

modified.

2. If the new clock is shut down, a clock start-up

delay is started.

3. Clock switch circuitry waits for a falling edge of

the current clock.

4. The current clock is held low and the clock

switch circuitry waits for a rising edge in the new clock.

5. The new clock is now active.

6. The OSCSTAT register is updated as required.

7. Clock switch is complete.

See Figure 5-3 for more details.

If the internal oscillator speed is switched between two clocks of the same source, there is no start-up delay before the new frequency is selected. Clock switching time delays are shown in Table 5-2.

Start-up delay specifications are located in Table 28-7, “Oscillator Parameters”.

DS40001607C-page 46  2011-2014 Microchip Technology Inc.

FIGURE 5-3: INTERNAL OSCILLATOR SWITCH TIMING

HFINTOSC

LFINTOSC

IRCF <3:0>

System Clock

HFINTOSC

LFINTOSC

IRCF <3:0>

System Clock

0 0

2-cycle Sync Running

HFINTOSC LFINTOSC (WDT disabled)

HFINTOSC LFINTOSC (WDT enabled)

LFINTOSC

HFINTOSC

IRCF <3:0>

System Clock

= 0  0

2-cycle Sync

Running

LFINTOSC HFINTOSC

LFINTOSC turns off unless WDT is enabled

(2)

Note 1: See Tab le 5 -2, “Oscillator Switching Delays” for more information.

2: LFINTOSC will continue to run if a peripheral has selected it as the clock source. See

Section 5.2.2.4 “Peripheral Clock Sources”.

Oscillator Delay

(1)

Oscillator Delay

(1)

PIC16(L)F1503

 2011-2014 Microchip Technology Inc. DS40001607C-page 47

PIC16(L)F1503

5.3 Clock Switching

The system clock source can be switched between external and internal clock sources via software using the System Clock Select (SCS) bits of the OSCCON register. The following clock sources can be selected using the SCS bits:

• Default system oscillator determined by FOSC bits in Configuration Words

• Internal Oscillator Block (INTOSC)

5.3.1 SYSTEM CLOCK SELECT (SCS)

BITS

The System Clock Select (SCS) bits of the OSCCON register selects the system clock source that is used for the CPU and peripherals.

• When the SCS bits of the OSCCON register = 00, the system clock source is determined by value of the FOSC<1:0> bits in the Configuration Words.

• When the SCS bits of the OSCCON register = 01, the system clock source is the secondary oscillator.

• When the SCS bits of the OSCCON register = 1x, the system clock source is chosen by the internal oscillator frequency selected by the IRCF<3:0> bits of the OSCCON register. After a Reset, the SCS bits of the OSCCON register are always cleared.

When switching between clock sources, a delay is required to allow the new clock to stabilize. These oscillator delays are shown in Tab l e 5 -2 .

TABLE 5-2: OSCILLATOR SWITCHING DELAYS

Switch From Switch To Oscillator Delay

LFINTOSC 1 cycle of each clock source

Any clock source

HFINTOSC 2 s (approx.) ECH, ECM, ECL 2 cycles

DS40001607C-page 48  2011-2014 Microchip Technology Inc.

PIC16(L)F1503

5.4 Register Definitions: Oscillator Control

REGISTER 5-1: OSCCON: OSCILLATOR CONTROL REGISTER

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

(1)

IRCF<3:0>

—

bit 7 bit 0

Legend:

bit 7 Unimplemented: Read as ‘0’ bit 6-3 IRCF<3:0>: Internal Oscillator Frequency Select bits

1111 =16MHz 1110 =8MHz 1101 =4MHz 1100 =2MHz 1011 =1MHz 1010 = 500 kHz 1001 = 250 kHz 1000 = 125 kHz 0111 = 500 kHz (default upon Reset) 0110 = 250 kHz 0101 = 125 kHz 0100 = 62.5 kHz 001x = 31.25 kHz 000x =31kHz LF

bit 2 Unimplemented: Read as ‘0’ bit 1-0 SCS<1:0>: System Clock Select bits

1x = Internal oscillator block 01 = Reserved 00 = Clock determined by FOSC<1:0> in Configuration Words.

SCS<1:0>

Note 1: Duplicate frequency derived from HFINTOSC.

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PIC16(L)F1503

REGISTER 5-2: OSCSTAT: OSCILLATOR STATUS REGISTER

U-0

—

bit 7 bit 0

Legend:

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

u = Bit is unchanged x = Bit is unknown -n/n = Value at POR and BOR/Value at all other Resets

‘1’ = Bit is set ‘0’ = Bit is cleared q = Conditional

bit 7-5 Unimplemented: Read as ‘0’

bit 4 HFIOFR: High-Frequency Internal Oscillator Ready bit

bit 3-2 Unimplemented: Read as ‘0’

bit 1 LFIOFR: Low-Frequency Internal Oscillator Ready bit

bit 0 HFIOFS: High-Frequency Internal Oscillator Stable bit

U-0 U-0 R-0/q U-0 U-0 R-0/q R-0/q

— —

1 = HFINTOSC is ready 0 = HFINTOSC is not ready

1 = LFINTOSC is ready 0 = LFINTOSC is not ready

1 = HFINTOSC 16 MHz Oscillator is stable and is driving the INTOSC 0 = HFINTOSC 16 MHz is not stable, the Start-up Oscillator is driving INTOSC

HFIOFR

— —

LFIOFR HFIOFS

TABLE 5-3: SUMMARY OF REGISTERS ASSOCIATED WITH CLOCK SOURCES

Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

OSCCON

OSCSTAT

— IRCF<3:0> —SCS<1:0>49

— — —HFIOFR — — LFIOFR HFIOFS 50

Legend: — = unimplemented location, read as ‘0’. Shaded cells are not used by clock sources.

TABLE 5-4: SUMMARY OF CONFIGURATION WORD WITH CLOCK SOURCES

Name Bits Bit -/7 Bit -/6 Bit 13/5 Bit 12/4 Bit 11/3 Bit 10/2 Bit 9/1 Bit 8/0

CONFIG1

Legend: — = unimplemented location, read as ‘0’. Shaded cells are not used by clock sources.

DS40001607C-page 50  2011-2014 Microchip Technology Inc.

13:8

7:0

— — — —CLKOUTEN BOREN<1:0> —

CP MCLRE PWRTE WDTE<1:0> —FOSC<1:0>

PIC16(L)F1503

Device

Reset

Power-on

Reset

WDT

Time-out

Brown-out

Reset

LPBOR

Reset

RESET Instruction

MCLRE

Sleep

BOR

Active

(1)

PWRTE

LFINTOSC

VDD

ICSP™ Programming Mode Exit

Stack Underflow

Stack Overlfow

VPP/MCLR

Power-up

Timer

Rev. 10-000006A

8/14/2013

Note 1: See Table 6-1 for BOR active conditions.

6.0 RESETS

There are multiple ways to reset this device:

• Power-On Reset (POR)

• Brown-Out Reset (BOR)

• Low-Power Brown-Out Reset (LPBOR)

•MCLR Reset

•WDT Reset

• RESET instruction

• Stack Overflow

• Stack Underflow

• Programming mode exit

To a l lo w V DD to stabilize, an optional power-up timer can be enabled to extend the Reset time after a BOR or POR event.

A simplified block diagram of the On-chip Reset Circuit is shown in Figure 6-1.

FIGURE 6-1: SIMPLIFIED BLOCK DIAGRAM OF ON-CHIP RESET CIRCUIT

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PIC16(L)F1503

6.1 Power-On Reset (POR)

The POR circuit holds the device in Reset until VDD has reached an acceptable level for minimum operation. Slow rising V performance may require greater than minimum V The PWRT, BOR or MCLR extend the start-up period until all device operation conditions have been met.

6.1.1 POWER-UP TIMER (PWRT)

The Power-up Timer provides a nominal 64 ms time-out on POR or Brown-out Reset.

The device is held in Reset as long as PWRT is active. The PWRT delay allows additional time for the V rise to an acceptable level. The Power-up Timer is enabled by clearing the PWRTE bit in Configuration Words.

The Power-up Timer starts after the release of the POR and BOR.

For additional information, refer to Application Note AN607, “Power-up Trouble Shooting” (DS00607).

DD, fast operating speeds or analog

DD.

features can be used to

DD to

6.2 Brown-Out Reset (BOR)

The BOR circuit holds the device in Reset when VDD reaches a selectable minimum level. Between the POR and BOR, complete voltage range coverage for execution protection can be implemented.

The Brown-out Reset module has four operating modes controlled by the BOREN<1:0> bits in Configuration Words. The four operating modes are:

• BOR is always on

• BOR is off when in Sleep

• BOR is controlled by software

• BOR is always off

Refer to Tab le 6- 1 for more information.

The Brown-out Reset voltage level is selectable by configuring the BORV bit in Configuration Words.

DD noise rejection filter prevents the BOR from trig-

A V gering on small events. If V duration greater than parameter T will reset. See Figure 6-2 for more information.

DD falls below Vpor for a

BORDC, the device

TABLE 6-1: BOR OPERATING MODES

BOREN<1:0> SBOREN Device Mode BOR Mode

11 X X Active Waits for BOR ready

10 X

0 X Disabled Begins immediately

00 X XDisabled

Note 1: In these specific cases, “release of POR” and “wake-up from Sleep,” there is no delay in start-up. The BOR

ready flag, (BORRDY = 1), will be set before the CPU is ready to execute instructions because the BOR circuit is forced on by the BOREN<1:0> bits.

Awake Active Waits for BOR ready

Sleep Disabled

Active Waits for BOR ready

Instruction Execution upon:

Release of POR or Wake-up from Sleep

(1)

(BORRDY = 1)

(1)

(BORRDY = 1)

(BORRDY = x)

6.2.1 BOR IS ALWAYS ON

When the BOREN bits of Configuration Words are programmed to ‘11’, the BOR is always on. The device start-up will be delayed until the BOR is ready and VDD is higher than the BOR threshold.

BOR protection is active during Sleep. The BOR does not delay wake-up from Sleep.

6.2.2 BOR IS OFF IN SLEEP

When the BOREN bits of Configuration Words are programmed to ‘10’, the BOR is on, except in Sleep. The device start-up will be delayed until the BOR is ready

DD is higher than the BOR threshold.

and V

DS40001607C-page 52  2011-2014 Microchip Technology Inc.

BOR protection is not active during Sleep. The device wake-up will be delayed until the BOR is ready.

6.2.3 BOR CONTROLLED BY SOFTWARE

When the BOREN bits of Configuration Words are programmed to ‘01’, the BOR is controlled by the SBOREN bit of the BORCON register. The device start-up is not delayed by the BOR ready condition or

DD level.

the V

BOR protection begins as soon as the BOR circuit is ready. The status of the BOR circuit is reflected in the BORRDY bit of the BORCON register.

BOR protection is unchanged by Sleep.

FIGURE 6-2: BROWN-OUT SITUATIONS

TPWRT

(1)

VBOR

Internal

Reset

VBOR

Internal

Reset

TPWRT

(1)

< TPWRT

TPWRT

(1)

VBOR

Internal

Reset

Note 1: TPW RT delay only if PWRTE bit is programmed to ‘0’.

PIC16(L)F1503

6.3 Register Definitions: BOR Control

REGISTER 6-1: BORCON: BROWN-OUT RESET CONTROL REGISTER

R/W-1/u R/W-0/u U-0 U-0 U-0 U-0 U-0 R-q/u

SBOREN BORFS

bit 7 bit 0

Legend:

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

u = Bit is unchanged x = Bit is unknown -n/n = Value at POR and BOR/Value at all other Resets

‘1’ = Bit is set ‘0’ = Bit is cleared q = Value depends on condition

bit 7 SBOREN: Software Brown-Out Reset Enable bit

If BOREN <1:0> in Configuration Words =

1 = BOR Enabled 0 = BOR Disabled

If BOREN <1:0> in Configuration Words SBOREN is read/write, but has no effect on the BOR

bit 6 BORFS: Brown-Out Reset Fast Start bit

If BOREN <1:0> = 10 (Disabled in Sleep) or BOREN<1:0> = 01 (Under software control):

1 = Band gap is forced on always (covers sleep/wake-up/operating cases) 0 = Band gap operates normally, and may turn off

If BOREN<1:0> = 11 (Always on) or BOREN<1:0> = 00 (Always off) BORFS is Read/Write, but has no effect.

bit 5-1 Unimplemented: Read as ‘0’

bit 0 BORRDY: Brown-Out Reset Circuit Ready Status bit

1 = The Brown-out Reset circuit is active 0 = The Brown-out Reset circuit is inactive

— — — — —BORRDY

01:

 01:

(1)

Note 1: BOREN<1:0> bits are located in Configuration Words.

 2011-2014 Microchip Technology Inc. DS40001607C-page 53

PIC16(L)F1503

6.4 Low-Power Brown-Out Reset (LPBOR)

The Low-Power Brown-Out Reset (LPBOR) operates like the BOR to detect low voltage conditions on the VDD pin. When too low of a voltage is detected, the device is held in Reset. When this occurs, a register bit (BOR) is changed to indicate that a BOR Reset has occurred. The BOR bit in PCON is used for both BOR and the LPBOR. Refer to Register 6-2.

The LPBOR voltage threshold (Lapboard) has a wider tolerance than the BOR (Vpor), but requires much less current (LPBOR current) to operate. The LPBOR is intended for use when the BOR is configured as disabled (BOREN = 00) or disabled in Sleep mode (BOREN = 10).

Refer to Figure 6-1 to see how the LPBOR interacts with other modules.

6.4.1 ENABLING LPBOR

The LPBOR is controlled by the LPBOR bit of Configuration Words. When the device is erased, the LPBOR module defaults to disabled.

6.5 MCLR

The MCLR is an optional external input that can reset the device. The MCLR MCLRE bit of Configuration Words and the LVP bit of Configuration Words (Table 6-2).

TABLE 6-2: MCLR CONFIGURATION

MCLRE LVP MCLR

00Disabled 10Enabled x1Enabled

6.5.1 MCLR ENABLED

When MCLR is enabled and the pin is held low, the device is held in Reset. The MCLR V

DD through an internal weak pull-up.

The device has a noise filter in the MCLR The filter will detect and ignore small pulses.

Note: A Reset does not drive the MCLR

6.5.2 MCLR DISABLED

When MCLR is disabled, the pin functions as a general purpose input and the internal weak pull-up is under software control. See Section 11.3 “PORTA Regis-

ters” for more information.

function is controlled by the

pin is connected to

Reset path.

pin low.

6.6 Watchdog Timer (WDT) Reset

The Watchdog Timer generates a Reset if the firmware does not issue a CLRWDT instruction within the time-out period. The TO changed to indicate the WDT Reset. See Section 9.0

“Watchdog Timer (WDT)” for more information.

and PD bits in the STATUS register are

6.7 RESET Instruction

A RESET instruction will cause a device Reset. The RI bit in the PCON register will be set to ‘0’. See Ta b le 6 - 4 for default conditions after a RESET instruction has occurred.

6.8 Stack Overflow/Underflow Reset

The device can reset when the Stack Overflows or Underflows. The STKOVF or STKUNF bits of the PCON register indicate the Reset condition. These Resets are enabled by setting the STVREN bit in Configuration Words. See Section 3.4.2 “Overflow/Underflow

Reset” for more information.

6.9 Programming Mode Exit

Upon exit of Programming mode, the device will behave as if a POR had just occurred.

6.10 Power-Up Timer

The Power-up Timer optionally delays device execution after a BOR or POR event. This timer is typically used to allow VDD to stabilize before allowing the device to start running.

The Power-up Timer is controlled by the PWRTE Configuration Words.

bit of

6.11 Start-up Sequence

Upon the release of a POR or BOR, the following must occur before the device will begin executing:

1. Power-up Timer runs to completion (if enabled).

2. MCLR

The total time-out will vary based on oscillator configuration and Power-up Timer configuration. SeeSection 5.0 “Oscillator Module” for more information.

The Power-up Timer runs independently of MCLR Reset. If MCLR is kept low long enough, the Power-up Timer will expire. Upon bringing MCLR will begin execution after 10 F

Figure 6-3). This is useful for testing purposes or to

synchronize more than one device operating in parallel.

must be released (if enabled).

high, the device

OSS cycles (see

DS40001607C-page 54  2011-2014 Microchip Technology Inc.

FIGURE 6-3: RESET START-UP SEQUENCE

Note 1: Code execution begins 10 FOSC cycles after the FOSC clock is released.

Internal POR

External Clock (EC modes), PWRTEN = 0

Internal RESET

MCLR

FOSC

Begin Execution

Ext. Clock (EC)

Power-up Timer

External Clock (EC modes), PWRTEN = 1

code execution

(1)

code execution

(1)

TPWRT

Int. Oscillator

code execution

(1)

Internal Oscillator, PWRTEN = 0

Internal Oscillator, PWRTEN = 1

code execution

(1)

TPWRT

VDD

Internal POR

Internal RESET

MCLR

FOSC

Begin Execution

Power-up Timer

Rev. 10-000032B

7/30/2013

PIC16(L)F1503

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PIC16(L)F1503

6.12 Determining the Cause of a Reset

Upon any Reset, multiple bits in the STATUS and PCON registers are updated to indicate the cause of the Reset. Tab le 6 - 3 and Tab le 6 -4 show the Reset conditions of these registers.

TABLE 6-3: RESET STATUS BITS AND THEIR SIGNIFICANCE

STKOVF STKUNF RWDT RMCLR RI POR BOR TO PD Condition

001110x11Power-on Reset

001110x0xIllegal, TO

001110xx0Illegal, PD is set on POR

00u11u011Brown-out Reset

uu0uuuu0uWDT Reset

uuuuuuu00WDT Wake-up from Sleep

uuuuuuu10Interrupt Wake-up from Sleep

uuu0uuuuuMCLR

uuu0uuu10MCLR

u u u u 0 u u u u RESET Instruction Executed

1uuuuuuuuStack Overflow Reset (STVREN = 1)

u1uuuuuuuStack Underflow Reset (STVREN = 1)

is set on POR

Reset during normal operation

Reset during Sleep

TABLE 6-4: RESET CONDITION FOR SPECIAL REGISTERS

Condition

Power-on Reset 0000h ---1 1000 00-- 110x

MCLR

Reset during normal operation 0000h ---u muumuu uu-- 0uuu

MCLR Reset during Sleep 0000h ---1 0uuu uu-- 0uuu

WDT Reset 0000h ---0 muumuu uu-- uuuu

WDT Wake-up from Sleep PC + 1 ---0 0uuu uu-- uuuu

Brown-out Reset 0000h ---1 1uuu 00-- 11u0

Interrupt Wake-up from Sleep PC + 1

RESET Instruction Executed 0000h ---u uuuu uu-- u0uu

Stack Overflow Reset (STVREN = 1) 0000h ---u uuuu 1u-- uuuu

Stack Underflow Reset (STVREN = 1) 0000h ---u uuuu u1-- uuuu

Legend: u = unchanged, x = unknown, - = unimplemented bit, reads as ‘0’. Note 1: When the wake-up is due to an interrupt and the Global Interrupt Enable bit (GIE) is set, the return address

is pushed on the stack and PC is loaded with the interrupt vector (0004h) after execution of PC + 1.

Program Counter

(1)

STATUS

---1 0uuu uu-- uuuu

PCON

DS40001607C-page 56  2011-2014 Microchip Technology Inc.

PIC16(L)F1503

6.13 Power Control (PCON) Register

The Power Control (PCON) register contains flag bits to differentiate between a:

• Power-On Reset (POR

• Brown-Out Reset (BOR)

• Reset Instruction Reset (RI

•MCLR Reset (RMCLR)

• Watchdog Timer Reset (RWDT)

• Stack Underflow Reset (STKUNF)

• Stack Overflow Reset (STKOVF)

The PCON register bits are shown in Register 6-2.

6.14 Register Definitions: Power Control

REGISTER 6-2: PCON: POWER CONTROL REGISTER

R/W/HS-0/q R/W/HS-0/q U-0 R/W/HC-1/q R/W/HC-1/q R/W/HC-1/q R/W/HC-q/u R/W/HC-q/u

STKOVF STKUNF —

bit 7 bit 0

)

RWDT

RMCLR RI POR BOR

Legend:

HC = Bit is cleared by hardware HS = Bit is set by hardware R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ u = Bit is unchanged x = Bit is unknown -n/n = Value at POR and BOR/Value at all other Resets ‘1’ = Bit is set ‘0’ = Bit is cleared q = Value depends on condition

bit 7 STKOVF: Stack Overflow Flag bit

1 = A Stack Overflow occurred 0 = A Stack Overflow has not occurred or cleared by firmware

bit 6 STKUNF: Stack Underflow Flag bit

1 = A Stack Underflow occurred 0 = A Stack Underflow has not occurred or cleared by firmware

bit 5 Unimplemented: Read as ‘0’ bit 4 RWDT

bit 3 RMCLR

bit 2 RI: RESET Instruction Flag bit

bit 1 POR

bit 0 BOR

: Watchdog Timer Reset Flag bit

1 = A Watchdog Timer Reset has not occurred or set by firmware 0 = A Watchdog Timer Reset has occurred (cleared by hardware)

: MCLR Reset Flag bit

1 = A MCLR Reset has not occurred or set by firmware 0 = A MCLR

1 = A RESET instruction has not been executed or set by firmware 0 = A RESET instruction has been executed (cleared by hardware)

1 = No Power-on Reset occurred 0 = A Power-on Reset occurred (must be set in software after a Power-on Reset occurs)

1 = No Brown-out Reset occurred 0 = A Brown-out Reset occurred (must be set in software after a Power-on Reset or Brown-out Reset

occurs)

Reset has occurred (cleared by hardware)

: Power-On Reset Status bit

: Brown-Out Reset Status bit

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PIC16(L)F1503

TABLE 6-5: SUMMARY OF REGISTERS ASSOCIATED WITH RESETS

Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

BORCON SBOREN BORFS

PCON STKOVF STKUNF

STATUS

WDTCON

Legend: — = unimplemented bit, reads as ‘0’. Shaded cells are not used by Resets. Note 1: Other (non Power-up) Resets include MCLR

— — —TOPD Z DC C 17

— — WDTPS<4:0> SWDTEN 77

— — — — — BORRDY 53

—RWDTRMCLR RI POR BOR 57

Reset and Watchdog Timer Reset during normal operation.

TABLE 6-6: SUMMARY OF CONFIGURATION WORD WITH RESETS

Name Bits Bit -/7 Bit -/6 Bit 13/5 Bit 12/4 Bit 11/3 Bit 10/2 Bit 9/1 Bit 8/0

CONFIG1

CONFIG2

Legend: — = unimplemented location, read as ‘0’. Shaded cells are not used by Resets.

13:8

7:0

13:8

7:0

— — — — CLKOUTEN BOREN<1:0> —

CP MCLRE PWRTE WDTE<1:0> —

— — LVP DEBUG LPBOR BORV STVREN —

— — — — — — WRT<1:0>

FOSC<1:0>

DS40001607C-page 58  2011-2014 Microchip Technology Inc.

7.0 INTERRUPTS

TMR0IF

TMR0IE

INTF INTE

IOCIF

IOCIE

Interrupt to CPU

Wake-up (If in Sleep mode)

GIE

(TMR1IF) PIR1<0>

PIRn<7>

PEIE

(TMR1IE) PIE1<0>

Peripheral Interrupts

PIEn<7>

Rev. 10-000010A

7/30/2013

The interrupt feature allows certain events to preempt normal program flow. Firmware is used to determine the source of the interrupt and act accordingly. Some interrupts can be configured to wake the MCU from Sleep mode.

This chapter contains the following information for Interrupts:

• Operation

• Interrupt Latency

• Interrupts During Sleep

•INT Pin

• Automatic Context Saving

Many peripherals produce interrupts. Refer to the corresponding chapters for details.

A block diagram of the interrupt logic is shown in

Figure 7-1.

FIGURE 7-1: INTERRUPT LOGIC

PIC16(L)F1503

 2011-2014 Microchip Technology Inc. DS40001607C-page 59

PIC16(L)F1503

7.1 Operation

Interrupts are disabled upon any device Reset. They are enabled by setting the following bits:

• GIE bit of the INTCON register

• Interrupt Enable bit(s) for the specific interrupt

event(s)

• PEIE bit of the INTCON register (if the Interrupt

Enable bit of the interrupt event is contained in the PIE1, PIE2 and PIE3 registers)

The INTCON, PIR1, PIR2 and PIR3 registers record individual interrupts via interrupt flag bits. Interrupt flag bits will be set, regardless of the status of the GIE, PEIE and individual interrupt enable bits.

The following events happen when an interrupt event occurs while the GIE bit is set:

• Current prefetched instruction is flushed

• GIE bit is cleared

• Current Program Counter (PC) is pushed onto the

stack

• Critical registers are automatically saved to the

shadow registers (See “Section 7.5 “Automatic

Context Saving”.”)

• PC is loaded with the interrupt vector 0004h

The firmware within the Interrupt Service Routine (ISR) should determine the source of the interrupt by polling the interrupt flag bits. The interrupt flag bits must be cleared before exiting the ISR to avoid repeated interrupts. Because the GIE bit is cleared, any interrupt that occurs while executing the ISR will be recorded through its interrupt flag, but will not cause the processor to redirect to the interrupt vector.

The RETFIE instruction exits the ISR by popping the previous address from the stack, restoring the saved context from the shadow registers and setting the GIE bit.

For additional information on a specific interrupt’s operation, refer to its peripheral chapter.

7.2 Interrupt Latency

Interrupt latency is defined as the time from when the interrupt event occurs to the time code execution at the interrupt vector begins. The latency for synchronous interrupts is three or four instruction cycles. For asynchronous interrupts, the latency is three to five instruction cycles, depending on when the interrupt occurs. See Figure 7-2 and Figure 7-3 for more details.

Note 1: Individual interrupt flag bits are set,

regardless of the state of any other enable bits.

2: All interrupts will be ignored while the GIE

bit is cleared. Any interrupt occurring while the GIE bit is clear will be serviced when the GIE bit is set again.

DS40001607C-page 60  2011-2014 Microchip Technology Inc.

Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4

Fosc

PC 0004h 0005h

Inst(0004h)NOP

GIE

Q1 Q2 Q3 Q4Q1 Q2 Q3 Q4

1-Cycle Instruction at PC

Inst(0004h)NOP

2-Cycle Instruction at PC

FSR ADDR PC+1 PC+2 0004h 0005h

Inst(0004h)NOP

GIE

PCPC-1

3-Cycle Instruction at PC

Execute

Interrupt

Inst(PC)

Interrupt Sampled during Q1

Inst(PC)

PC-1 PC+1

NOP

New PC/

PC+1

0005hPC-1

PC+1/FSR

ADDR

0004h

NOP

Interrupt

GIE

Interrupt

INST(PC) NOPNOP

FSR ADDR PC+1 PC+2 0004h 0005h

Inst(0004h)NOP

GIE

PCPC-1

3-Cycle Instruction at PC

Interrupt

INST(PC) NOPNOP

NOP

Inst(0005h)

Execute

PIC16(L)F1503

FIGURE 7-2: INTERRUPT LATENCY

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PIC16(L)F1503

Q2Q1 Q3 Q4 Q2Q1 Q3 Q4 Q2Q1 Q3 Q4 Q2Q1 Q3 Q4 Q2Q1 Q3 Q4

FOSC

CLKOUT

INT pin

INTF

GIE

INSTRUCTION FLOW

Instruction Fetched

Instruction Executed

Interrupt Latency

PC PC + 1

PC + 1

0004h

0005h

Inst (0004h)

Inst (0005h)

Forced NOP

Inst (PC)

Inst (PC + 1)

Inst (PC – 1)

Inst (0004h)

Forced NOP

Inst (PC)

—

Note 1: INTF flag is sampled here (every Q1).

2: Asynchronous interrupt latency = 3-5 T

CY. Synchronous latency = 3-4 TCY, where TCY = instruction cycle time.

Latency is the same whether Inst (PC) is a single cycle or a 2-cycle instruction.

3: For minimum width of INT pulse, refer to AC specifications in Section 28.0 “Electrical Specifications”.

4: INTF is enabled to be set any time during the Q4-Q1 cycles.

(1)

(2)

(3)

(4)

(1)

FIGURE 7-3: INT PIN INTERRUPT TIMING

DS40001607C-page 62  2011-2014 Microchip Technology Inc.

7.3 Interrupts During Sleep

Some interrupts can be used to wake from Sleep. To wake from Sleep, the peripheral must be able to operate without the system clock. The interrupt source must have the appropriate Interrupt Enable bit(s) set prior to entering Sleep.

On waking from Sleep, if the GIE bit is also set, the processor will branch to the interrupt vector. Otherwise, the processor will continue executing instructions after the SLEEP instruction. The instruction directly after the SLEEP instruction will always be executed before branching to the ISR. Refer to Section 8.0 “Power-

Down Mode (Sleep)” for more details.

7.4 INT Pin

The INT pin can be used to generate an asynchronous edge-triggered interrupt. This interrupt is enabled by setting the INTE bit of the INTCON register. The INTEDG bit of the OPTION_REG register determines on which edge the interrupt will occur. When the INTEDG bit is set, the rising edge will cause the interrupt. When the INTEDG bit is clear, the falling edge will cause the interrupt. The INTF bit of the INTCON register will be set when a valid edge appears on the INT pin. If the GIE and INTE bits are also set, the processor will redirect program execution to the interrupt vector.

PIC16(L)F1503

7.5 Automatic Context Saving

Upon entering an interrupt, the return PC address is saved on the stack. Additionally, the following registers are automatically saved in the shadow registers:

• W register

• STATUS register (except for TO

• BSR register

• FSR registers

• PCLATH register

Upon exiting the Interrupt Service Routine, these registers are automatically restored. Any modifications to these registers during the ISR will be lost. If modifications to any of these registers are desired, the corresponding shadow register should be modified and the value will be restored when exiting the ISR. The shadow registers are available in Bank 31 and are readable and writable. Depending on the user’s application, other registers may also need to be saved.

and PD)

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PIC16(L)F1503

7.6 Register Definitions: Interrupt Control

REGISTER 7-1: INTCON: INTERRUPT CONTROL REGISTER

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

(1)

GIE

bit 7 bit 0

Legend:

PEIE

(2)

TMR0IE INTE IOCIE TMR0IF INTF IOCIF

(3)

bit 7 GIE: Global Interrupt Enable bit

1 = Enables all active interrupts 0 = Disables all interrupts

bit 6 PEIE: Peripheral Interrupt Enable bit

1 = Enables all active peripheral interrupts 0 = Disables all peripheral interrupts

bit 5 TMR0IE: Timer0 Overflow Interrupt Enable bit

1 = Enables the Timer0 interrupt 0 = Disables the Timer0 interrupt

bit 4 INTE: INT External Interrupt Enable bit

1 = Enables the INT external interrupt 0 = Disables the INT external interrupt

bit 3 IOCIE: Interrupt-on-Change Enable bit

1 = Enables the interrupt-on-change 0 = Disables the interrupt-on-change

bit 2 TMR0IF: Timer0 Overflow Interrupt Flag bit

1 = TMR0 register has overflowed 0 = TMR0 register did not overflow

bit 1 INTF: INT External Interrupt Flag bit

1 = The INT external interrupt occurred 0 = The INT external interrupt did not occur

bit 0 IOCIF: Interrupt-on-Change Interrupt Flag bit

1 = When at least one of the interrupt-on-change pins changed state 0 = None of the interrupt-on-change pins have changed state

(1)

(2)

(3)

Note 1: Interrupt flag bits are set when an interrupt condition occurs, regardless of the state of its corresponding

enable bit or the Global Interrupt Enable bit, GIE of the INTCON register. User software should ensure the appropriate interrupt flag bits are clear prior to enabling an interrupt.

2: Bit PEIE of the INTCON register must be set to enable any peripheral interrupt.

3: The IOCIF Flag bit is read-only and cleared when all the interrupt-on-change flags in the IOCxF registers

DS40001607C-page 64  2011-2014 Microchip Technology Inc.

have been cleared by software.

PIC16(L)F1503

REGISTER 7-2: PIE1: PERIPHERAL INTERRUPT ENABLE REGISTER 1

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

TMR1GIE ADIE

bit 7 bit 0

Legend:

bit 7 TMR1GIE: Timer1 Gate Interrupt Enable bit

1 = Enables the Timer1 gate acquisition interrupt 0 = Disables the Timer1 gate acquisition interrupt

bit 6 ADIE: Analog-to-Digital Converter (ADC) Interrupt Enable bit

1 = Enables the ADC interrupt 0 = Disables the ADC interrupt

bit 5-4 Unimplemented: Read as ‘0’ bit 3 SSP1IE: Synchronous Serial Port (MSSP) Interrupt Enable bit

1 = Enables the MSSP interrupt 0 = Disables the MSSP interrupt

bit 2 Unimplemented: Read as ‘0’ bit 1 TMR2IE: TMR2 to PR2 Match Interrupt Enable bit

1 = Enables the Timer2 to PR2 match interrupt 0 = Disables the Timer2 to PR2 match interrupt

bit 0 TMR1IE: Timer1 Overflow Interrupt Enable bit

1 = Enables the Timer1 overflow interrupt 0 = Disables the Timer1 overflow interrupt

— — SSP1IE — TMR2IE TMR1IE

Note: Bit PEIE of the INTCON register must be

set to enable any peripheral interrupt.

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PIC16(L)F1503

REGISTER 7-3: PIE2: PERIPHERAL INTERRUPT ENABLE REGISTER 2

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

—C2IEC1IE— BCL1IE NCO1IE — —

bit 7 bit 0

Legend:

bit 7 Unimplemented: Read as ‘0’ bit 6 C2IE: Comparator C2 Interrupt Enable bit

1 = Enables the Comparator C2 interrupt 0 = Disables the Comparator C2 interrupt

bit 5 C1IE: Comparator C1 Interrupt Enable bit

1 = Enables the Comparator C1 interrupt 0 = Disables the Comparator C1 interrupt

bit 4 Unimplemented: Read as ‘0’ bit 3 BCL1IE: MSSP Bus Collision Interrupt Enable bit

1 = Enables the MSSP Bus Collision Interrupt 0 = Disables the MSSP Bus Collision Interrupt

bit 2 NCO1IE: Numerically Controlled Oscillator Interrupt Enable bit

1 = Enables the NCO interrupt 0 = Disables the NCO interrupt

bit 1-0 Unimplemented: Read as ‘0’

Note: Bit PEIE of the INTCON register must be

set to enable any peripheral interrupt.

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PIC16(L)F1503

REGISTER 7-4: PIE3: PERIPHERAL INTERRUPT ENABLE REGISTER 3

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

— — — — — — CLC2IE CLC1IE

bit 7 bit 0

Legend:

bit 7-2 Unimplemented: Read as ‘0’ bit 1 CLC2IE: Configurable Logic Block 2 Interrupt Enable bit

1 = Enables the CLC 2 interrupt 0 = Disables the CLC 2 interrupt

bit 0 CLC1IE: Configurable Logic Block 1 Interrupt Enable bit

1 = Enables the CLC 1 interrupt 0 = Disables the CLC 1 interrupt

Note: Bit PEIE of the INTCON register must be

set to enable any peripheral interrupt.

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PIC16(L)F1503

REGISTER 7-5: PIR1: PERIPHERAL INTERRUPT REQUEST REGISTER 1

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

TMR1GIF ADIF

bit 7 bit 0

Legend:

bit 7 TMR1GIF: Timer1 Gate Interrupt Flag bit

1 = Interrupt is pending 0 = Interrupt is not pending

bit 6 ADIF: ADC Interrupt Flag bit

1 = Interrupt is pending 0 = Interrupt is not pending

bit 5-4 Unimplemented: Read as ‘0’ bit 3 SSP1IF: Synchronous Serial Port (MSSP) Interrupt Flag bit

1 = Interrupt is pending 0 = Interrupt is not pending

bit 2 Unimplemented: Read as ‘0’ bit 1 TMR2IF: Timer2 to PR2 Interrupt Flag bit

1 = Interrupt is pending 0 = Interrupt is not pending

bit 0 TMR1IF: Timer1 Overflow Interrupt Flag bit

1 = Interrupt is pending 0 = Interrupt is not pending

— — SSP1IF — TMR2IF TMR1IF

Note: Interrupt flag bits are set when an interrupt

condition occurs, regardless of the state of its corresponding enable bit or the Global Interrupt Enable bit, GIE of the INTCON register. User software should ensure the appropriate interrupt flag bits are clear prior to enabling an interrupt.

DS40001607C-page 68  2011-2014 Microchip Technology Inc.

PIC16(L)F1503

REGISTER 7-6: PIR2: PERIPHERAL INTERRUPT REQUEST REGISTER 2

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

— C2IF C1IF — BCL1IF NCO1IF — —

bit 7 bit 0

Legend:

bit 7 Unimplemented: Read as ‘0’ bit 6 C2IF: Comparator C2 Interrupt Flag bit

1 = Interrupt is pending 0 = Interrupt is not pending

bit 5 C1IF: Comparator C1 Interrupt Flag bit

1 = Interrupt is pending 0 = Interrupt is not pending

bit 4 Unimplemented: Read as ‘0’ bit 3 BCL1IF: MSSP Bus Collision Interrupt Flag bit

1 = Interrupt is pending 0 = Interrupt is not pending

bit 2 NCO1IF: Numerically Controlled Oscillator Flag bit

1 = Interrupt is pending 0 = Interrupt is not pending

bit 1-0 Unimplemented: Read as ‘0’

Note: Interrupt flag bits are set when an interrupt

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PIC16(L)F1503

REGISTER 7-7: PIR3: PERIPHERAL INTERRUPT REQUEST REGISTER 3

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

— — — — — — CLC2IF CLC1IF

bit 7 bit 0

Legend:

bit 7-2 Unimplemented: Read as ‘0’ bit 1 CLC2IF: Configurable Logic Block 2 Interrupt Flag bit

1 = Interrupt is pending 0 = Interrupt is not pending

bit 0 CLC1IF: Configurable Logic Block 1 Interrupt Flag bit

1 = Interrupt is pending 0 = Interrupt is not pending

Note: Interrupt flag bits are set when an interrupt

condition occurs, regardless of the state of its corresponding enable bit or the Global Enable bit, GIE of the INTCON register. User software should ensure the appropriate interrupt flag bits are clear prior to enabling an interrupt.

DS40001607C-page 70  2011-2014 Microchip Technology Inc.

PIC16(L)F1503

TABLE 7-1: SUMMARY OF REGISTERS ASSOCIATED WITH INTERRUPTS

Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

INTCON GIE PEIE TMR0IE INTE IOCIE TMR0IF INTF IOCIF 64

OPTION_REG

PIE1 TMR1GIE ADIE

PIE2

PIE3

PIR1 TMR1GIF ADIF

PIR2

PIR3 Legend: — = unimplemented location, read as ‘0’. Shaded cells are not used by interrupts.

WPUEN INTEDG TMR0CS TMR0SE PSA PS<2:0> 139

— — SSP1IE — TMR2IE TMR1IE 65

— C2IE C1IE — BCL1IE NCO1IE — — 66

— — — — — — CLC2IE CLC1IE 67

— — SSP1IF — TMR2IF TMR1IF 68

— C2IF C1IF — BCL1IF NCO1IF — — 69

— — — — — — CLC2IF CLC1IF 70

 2011-2014 Microchip Technology Inc. DS40001607C-page 71

PIC16(L)F1503

8.0 POWER-DOWN MODE (SLEEP)

The Power-down mode is entered by executing a SLEEP instruction.

Upon entering Sleep mode, the following conditions exist:

1. WDT will be cleared but keeps running, if

enabled for operation during Sleep.

2. PD

bit of the STATUS register is cleared.

3. TO bit of the STATUS register is set.

4. CPU clock is disabled.

5. 31 kHz LFINTOSC is unaffected and peripherals

that operate from it may continue operation in Sleep.

6. Timer1 and peripherals that operate from

Timer1 continue operation in Sleep when the Timer1 clock source selected is:

•LFINTOSC

•T1CKI

7. ADC is unaffected, if the dedicated FRC oscillator

is selected.

8. I/O ports maintain the status they had before

SLEEP was executed (driving high, low or highimpedance).

9. Resets other than WDT are not affected by

Sleep mode.

Refer to individual chapters for more details on peripheral operation during Sleep.

To minimize current consumption, the following conditions should be considered:

• I/O pins should not be floating

• External circuitry sinking current from I/O pins

• Internal circuitry sourcing current from I/O pins

• Current draw from pins with internal weak pull-ups

• Modules using 31 kHz LFINTOSC

• CWG, NCO and CLC modules using HFINTOSC

I/O pins that are high-impedance inputs should be pulled to V currents caused by floating inputs.

Examples of internal circuitry that might be sourcing current include the FVR module. See Section 13.0

“Fixed Voltage Reference (FVR)” for more

information on this module.

8.1 Wake-up from Sleep

The device can wake-up from Sleep through one of the following events:

1. External Reset input on MCLR

2. BOR Reset, if enabled

3. POR Reset

4. Watchdog Timer, if enabled

5. Any external interrupt

6. Interrupts by peripherals capable of running

during Sleep (see individual peripheral for more information)

DD or VSS externally to avoid switching

pin, if enabled

The first three events will cause a device Reset. The last three events are considered a continuation of program execution. To determine whether a device Reset or wake-up event occurred, refer to Section 6.12

“Determining the Cause of a Reset”.

When the SLEEP instruction is being executed, the next instruction (PC + 1) is prefetched. For the device to wake-up through an interrupt event, the corresponding interrupt enable bit must be enabled. Wake-up will occur regardless of the state of the GIE bit. If the GIE bit is disabled, the device continues execution at the instruction after the SLEEP instruction. If the GIE bit is enabled, the device executes the instruction after the SLEEP instruction, the device will then call the Interrupt Service Routine. In cases where the execution of the instruction following SLEEP is not desirable, the user should have a NOP after the SLEEP instruction.

The WDT is cleared when the device wakes up from Sleep, regardless of the source of wake-up.

8.1.1 WAKE-UP USING INTERRUPTS

When global interrupts are disabled (GIE cleared) and any interrupt source has both its interrupt enable bit and interrupt flag bit set, one of the following will occur:

• If the interrupt occurs before the execution of a SLEEP instruction

- SLEEP instruction will execute as a NOP.

- WDT and WDT prescaler will not be cleared

bit of the STATUS register will not be set

-TO

-PD bit of the STATUS register will not be

cleared.

• If the interrupt occurs during or after the execu- tion of a SLEEP instruction

- SLEEP instruction will be completely

executed

- Device will immediately wake-up from Sleep

- WDT and WDT prescaler will be cleared

bit of the STATUS register will be set

-TO

-PD bit of the STATUS register will be cleared

Even if the flag bits were checked before executing a SLEEP instruction, it may be possible for flag bits to become set before the SLEEP instruction completes. To determine whether a SLEEP instruction executed, test

bit. If the PD bit is set, the SLEEP instruction

the PD was executed as a NOP.

DS40001607C-page 72  2011-2014 Microchip Technology Inc.

FIGURE 8-1: WAKE-UP FROM SLEEP THROUGH INTERRUPT

Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1

Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4

CLKIN

(1)

CLKOUT

(2)

Interrupt flag

GIE bit

(INTCON reg.)

Instruction Flow

Instruction Fetched

Instruction Executed

PC PC + 1 PC + 2

Inst(PC) = Sleep

Inst(PC - 1)

Inst(PC + 1)

Sleep

Processor in

Sleep

Interrupt Latency

(4)

Inst(PC + 2)

Inst(PC + 1)

Inst(0004h)

Inst(0005h)

Inst(0004h)

Forced NOP

PC + 2 0004h 0005h

Forced NOP

OSC

(3)

PC + 2

Note 1: External clock. High, Medium, Low mode assumed.

2: CLKOUT is shown here for timing reference. 3: T1OSC; See Section 28.0 “Electrical Specifications”. (Applicable only if the T1 Oscillator exists on this particular device) 4: GIE = 1 assumed. In this case after wake-up, the processor calls the ISR at 0004h. If GIE = 0, execution will continue in-line.

PIC16(L)F1503

8.2 Low-Power Sleep Mode

This device contains an internal Low Dropout (LDO) voltage regulator, which allows the device I/O pins to operate at voltages up to 5.5V while the internal device logic operates at a lower voltage. The LDO and its associated reference circuitry must remain active when the device is in Sleep mode.

Low-Power Sleep mode allows the user to optimize the operating current in Sleep. Low-Power Sleep mode can be selected by setting the VREGPM bit of the VREGCON register, putting the LDO and reference circuitry in a low-power state whenever the device is in Sleep.

8.2.1 SLEEP CURRENT VS. WAKE-UP TIME

In the Default Operating mode, the LDO and reference circuitry remain in the normal configuration while in Sleep. The device is able to exit Sleep mode quickly since all circuits remain active. In Low-Power Sleep mode, when waking up from Sleep, an extra delay time is required for these circuits to return to the normal configuration and stabilize.

The Low-Power Sleep mode is beneficial for applications that stay in Sleep mode for long periods of time. The Normal mode is beneficial for applications that need to wake from Sleep quickly and frequently.

8.2.2 PERIPHERAL USAGE IN SLEEP

Some peripherals that can operate in Sleep mode will not operate properly with the Low-Power Sleep mode selected. The LDO will remain in the Normal-Power mode when those peripherals are enabled. The LowPower Sleep mode is intended for use with these peripherals:

• Brown-Out Reset (BOR)

• Watchdog Timer (WDT)

• External interrupt pin/Interrupt-on-change pins

• Timer1 (with external clock source)

The Complementary Waveform Generator (CWG), the Numerically Controlled Oscillator (NCO) and the Configurable Logic Cell (CLC) modules can utilize the HFINTOSC oscillator as either a clock source or as an input source. Under certain conditions, when the HFINTOSC is selected for use with the CWG, NCO or CLC modules, the HFINTOSC will remain active during Sleep. This will have a direct effect on the Sleep mode current.

Please refer to sections Section 23.5 “Operation

During Sleep”, 24.7 “Operation In Sleep” and 25.10 “Operation During Sleep” for more information.

Note: The PIC16LF1503 does not have a con-

figurable Low-Power Sleep mode. PIC16LF1503 is an unregulated device and is always in the lowest power state when in Sleep, with no wake-up time penalty. This device has a lower maximum

DD and I/O voltage than the

V PIC16F1503. See Section 28.0 “Electri-

cal Specifications” for more information.

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PIC16(L)F1503

8.3 Register Definitions: Voltage Regulator Control

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

— — — — — —VREGPMReserved

bit 7 bit 0

Legend:

bit 7-2 Unimplemented: Read as ‘0’ bit 1 VREGPM: Voltage Regulator Power Mode Selection bit

1 = Low-Power Sleep mode enabled in Sleep

Draws lowest current in Sleep, slower wake-up

0 = Normal Power mode enabled in Sleep

Draws higher current in Sleep, faster wake-up

bit 0 Reserved: Read as ‘1’. Maintain this bit set.

(2)

(1)

Note 1: PIC16F1503 only.

2: See Section 28.0 “Electrical Specifications”.

TABLE 8-1: SUMMARY OF REGISTERS ASSOCIATED WITH POWER-DOWN MODE

Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

INTCON GIE PEIE TMR0IE INTE IOCIE TMR0IF INTF IOCIF 64

IOCAF — — IOCAF5 IOCAF4 IOCAF3 IOCAF2 IOCAF1 IOCAF0 106

IOCAN

IOCAP

PIE1 TMR1GIE ADIE

PIE2

PIE3

PIR1 TMR1GIF ADIF

PIR2

PIR3

STATUS

WDTCON Legend: — = unimplemented, read as ‘0’. Shaded cells are not used in Power-Down mode.

— — IOCAN5 IOCAN4 IOCAN3 IOCAN2 IOCAN1 IOCAN0 106

— — IOCAP5 IOCAP4 IOCAP3 IOCAP2 IOCAP1 IOCAP0 106

— — SSP1IE — TMR2IE TMR1IE 65

— C2IE C1IE — BCL1IE NCO1IE — — 66

— — — — — — CLC2IE CLC1IE 67

— — SSP1IF — TMR2IF TMR1IF 68

— C2IF C1IF — BCL1IF NCO1IF — — 69

— — — — — — CLC2IF CLC1IF 70

— — —TOPD Z DC C 17

— — WDTPS<4:0> SWDTEN 77

Page

DS40001607C-page 74  2011-2014 Microchip Technology Inc.

9.0 WATCHDOG TIMER (WDT)

WDTE<1:0> = 01

SWDTEN

WDTE<1:0> = 11

WDTE<1:0> = 10

23-bit Programmable

Prescaler WDT

LFINTOSC

WDTPS<4:0>

WDT

Time-out

Sleep

Rev. 10-000141A

7/30/2013

The Watchdog Timer is a system timer that generates a Reset if the firmware does not issue a CLRWDT instruction within the time-out period. The Watchdog Timer is typically used to recover the system from unexpected events.

The WDT has the following features:

• Independent clock source

• Multiple operating modes

- WDT is always on

- WDT is off when in Sleep

- WDT is controlled by software

- WDT is always off

• Configurable time-out period is from 1 ms to 256

seconds (nominal)

• Multiple Reset conditions

• Operation during Sleep

FIGURE 9-1: WATCHDOG TIMER BLOCK DIAGRAM

PIC16(L)F1503

 2011-2014 Microchip Technology Inc. DS40001607C-page 75

PIC16(L)F1503

9.1 Independent Clock Source

The WDT derives its time base from the 31 kHz LFINTOSC internal oscillator. Time intervals in this chapter are based on a nominal interval of 1 ms. See

Section 28.0 “Electrical Specifications” for the

LFINTOSC tolerances.

9.2 WDT Operating Modes

The Watchdog Timer module has four operating modes controlled by the WDTE<1:0> bits in Configuration Words. See Ta bl e 9 - 1 .

9.2.1 WDT IS ALWAYS ON

When the WDTE bits of Configuration Words are set to ‘11’, the WDT is always on.

WDT protection is active during Sleep.

9.2.2 WDT IS OFF IN SLEEP

When the WDTE bits of Configuration Words are set to ‘10’, the WDT is on, except in Sleep.

WDT protection is not active during Sleep.

9.2.3 WDT CONTROLLED BY SOFTWARE

When the WDTE bits of Configuration Words are set to ‘01’, the WDT is controlled by the SWDTEN bit of the WDTCON register.

WDT protection is unchanged by Sleep. See Table 9-1 for more details.

TABLE 9-1: WDT OPERATING MODES

WDTE<1:0> SWDTEN

Device

Mode

WDT

Mode

9.3 Time-Out Period

The WDTPS bits of the WDTCON register set the time-out period from 1 ms to 256 seconds (nominal). After a Reset, the default time-out period is two seconds.

9.4 Clearing the WDT

The WDT is cleared when any of the following conditions occur:

•Any Reset

• CLRWDT instruction is executed

• Device enters Sleep

• Device wakes up from Sleep

• Oscillator fail

• WDT is disabled

See Table 9-2 for more information.

9.5 Operation During Sleep

When the device enters Sleep, the WDT is cleared. If the WDT is enabled during Sleep, the WDT resumes counting. When the device exits Sleep, the WDT is cleared again.

When a WDT time-out occurs while the device is in Sleep, no Reset is generated. Instead, the device wakes up and resumes operation. The TO in the STATUS register are changed to indicate the event. The RWDT bit in the PCON register can also be used. See Section 3.0 “Memory Organization” for more information.

and PD bits

11 X XActive

10 X

00 X X Disabled

Awake Active

Sleep Disabled

1 XActive

0 X Disabled

TABLE 9-2: WDT CLEARING CONDITIONS

Conditions WDT

WDTE<1:0> = 00 WDTE<1:0> = 01 and SWDTEN = 0 WDTE<1:0> = 10 and enter Sleep CLRWDT Command Oscillator Fail Detected Exit Sleep + System Clock = INTOSC, EXTCLK Change INTOSC divider (IRCF bits) Unaffected

DS40001607C-page 76  2011-2014 Microchip Technology Inc.

Cleared

PIC16(L)F1503

9.6 Register Definitions: Watchdog Timer Control

REGISTER 9-1: WDTCON: WATCHDOG TIMER CONTROL REGISTER

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

— — WDTPS<4:0> SWDTEN

bit 7 bit 0

Legend:

bit 7-6 Unimplemented: Read as ‘0’ bit 5-1 WDTPS<4:0>: Watchdog Timer Period Select bits

Bit Value = Prescale Rate 11111 = Reserved. Results in minimum interval (1:32)

•

10011 = Reserved. Results in minimum interval (1:32)

(1)

1x:

00:

) (Interval 256s nominal)

) (Interval 128s nominal)

) (Interval 64s nominal)

) (Interval 32s nominal)

) (Interval 16s nominal)

) (Interval 8s nominal)

) (Interval 4s nominal)

10010 = 1:8388608 (2 10001 = 1:4194304 (2 10000 = 1:2097152 (2 01111 = 1:1048576 (2 01110 = 1:524288 (2 01101 = 1:262144 (2 01100 = 1:131072 (2 01011 = 1:65536 (Interval 2s nominal) (Reset value) 01010 = 1:32768 (Interval 1s nominal) 01001 = 1:16384 (Interval 512 ms nominal) 01000 = 1:8192 (Interval 256 ms nominal) 00111 = 1:4096 (Interval 128 ms nominal) 00110 = 1:2048 (Interval 64 ms nominal) 00101 = 1:1024 (Interval 32 ms nominal) 00100 = 1:512 (Interval 16 ms nominal) 00011 = 1:256 (Interval 8 ms nominal) 00010 = 1:128 (Interval 4 ms nominal) 00001 = 1:64 (Interval 2 ms nominal) 00000 = 1:32 (Interval 1 ms nominal)

bit 0 SWDTEN: Software Enable/Disable for Watchdog Timer bit

If WDTE<1:0> = This bit is ignored. If WDTE<1:0> = 01:

1 = WDT is turned on 0 = WDT is turned off

If WDTE<1:0> = This bit is ignored.

Note 1: Times are approximate. WDT time is based on 31 kHz LFINTOSC.

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PIC16(L)F1503

TABLE 9-3: SUMMARY OF REGISTERS ASSOCIATED WITH WATCHDOG TIMER

Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

OSCCON

PCON

STATUS

WDTCON

Legend: x = unknown, u = unchanged, – = unimplemented locations read as ‘0’. Shaded cells are not used by Watchdog Timer.

— IRCF<3:0> —SCS<1:0>

STKOVF STKUNF —RWDTRMCLR RI POR BOR

— — —TOPD Z DC C

— — WDTPS<4:0> SWDTEN

TABLE 9-4: SUMMARY OF CONFIGURATION WORD WITH WATCHDOG TIMER

Name Bits Bit -/7 Bit -/6 Bit 13/5 Bit 12/4 Bit 11/3 Bit 10/2 Bit 9/1 Bit 8/0

CONFIG1

Legend: — = unimplemented location, read as ‘0’. Shaded cells are not used by Watchdog Timer.

13:8

7:0

— — — — CLKOUTEN BOREN<1:0> —

CP MCLRE PWRTE WDTE<1:0> — FOSC<1:0>

on Page

DS40001607C-page 78  2011-2014 Microchip Technology Inc.

PIC16(L)F1503

10.0 FLASH PROGRAM MEMORY

CONTROL

The Flash program memory is readable and writable during normal operation over the full V Program memory is indirectly addressed using Special Function Registers (SFRs). The SFRs used to access program memory are:

•PMCON1

•PMCON2

•PMDATL

•PMDATH

• PMADRL

•PMADRH

When accessing the program memory, the PMDATH:PMDATL register pair forms a 2-byte word that holds the 14-bit data for read/write, and the PMADRH:PMADRL register pair forms a 2-byte word that holds the 15-bit address of the program memory location being read.

The write time is controlled by an on-chip timer. The write/erase voltages are generated by an on-chip charge pump rated to operate over the operating voltage range of the device.

The Flash program memory can be protected in two ways; by code protection (CP and write protection (WRT<1:0> bits in Configuration Words).

Code protection (CP and writing, to the Flash program memory via external device programmers. Code protection does not affect the self-write and erase functionality. Code protection can only be reset by a device programmer performing a Bulk Erase to the device, clearing all Flash program memory, Configuration bits and User IDs.

Write protection prohibits self-write and erase to a portion or all of the Flash program memory, as defined by the bits WRT<1:0>. Write protection does not affect a device programmers ability to read, write or erase the device.

Note 1: Code protection of the entire Flash

program memory array is enabled by clearing the CP

bit in Configuration Words)

(1)

= 0)

, disables access, reading

bit of Configuration Words.

10.1 PMADRL and PMADRH Registers

The PMADRH:PMADRL register pair can address up to a maximum of 32K words of program memory. When selecting a program address value, the MSB of the address is written to the PMADRH register and the LSB is written to the PMADRL register.

DD range.

10.1.1 PMCON1 AND PMCON2 REGISTERS

PMCON1 is the control register for Flash program memory accesses.

Control bits RD and WR initiate read and write, respectively. These bits cannot be cleared, only set, in software. They are cleared by hardware at completion of the read or write operation. The inability to clear the WR bit in software prevents the accidental, premature termination of a write operation.

The WREN bit, when set, will allow a write operation to occur. On power-up, the WREN bit is clear. The WRERR bit is set when a write operation is interrupted by a Reset during normal operation. In these situations, following Reset, the user can check the WRERR bit and execute the appropriate error handling routine.

The PMCON2 register is a write-only register. Attempting to read the PMCON2 register will return all ‘0’s.

To enable writes to the program memory, a specific pattern (the unlock sequence), must be written to the PMCON2 register. The required unlock sequence prevents inadvertent writes to the program memory write latches and Flash program memory.

10.2 Flash Program Memory Overview

It is important to understand the Flash program memory structure for erase and programming operations. Flash program memory is arranged in rows. A row consists of a fixed number of 14-bit program memory words. A row is the minimum size that can be erased by user software.

After a row has been erased, the user can reprogram all or a portion of this row. Data to be written into the program memory row is written to 14-bit wide data write latches. These write latches are not directly accessible to the user, but may be loaded via sequential writes to the PMDATH:PMDATL register pair.

Note: If the user wants to modify only a portion

of a previously programmed row, then the contents of the entire row must be read and saved in RAM prior to the erase. Then, new data and retained data can be written into the write latches to reprogram the row of Flash program memory. However, any unprogrammed locations can be written without first erasing the row. In this case, it is not necessary to save and rewrite the other previously programmed locations.

See Table 10-1 for Erase Row size and the number of write latches for Flash program memory.

 2011-2014 Microchip Technology Inc. DS40001607C-page 79

PIC16(L)F1503

Start

Read Operation

Select

Program or Configuration Memory

(CFGS)

Select

Word Address

(PMADRH:PMADRL)

Initiate Read operation

(RD = 1)

Instruction fetched ignored

NOP execution forced

Data read now in

PMDATH:PMDATL

Instruction fetched ignored

NOP execution forced

End

Read Operation

Rev. 10-000046A

7/30/2013

TABLE 10-1: FLASH MEMORY

ORGANIZATION BY DEVICE

Device

Row Erase

(words)

PIC16(L)F1503 16 16

Write

Latches

(words)

10.2.1 READING THE FLASH PROGRAM MEMORY

To read a program memory location, the user must:

1. Write the desired address to the

PMADRH:PMADRL register pair.

2. Clear the CFGS bit of the PMCON1 register.

3. Then, set control bit RD of the PMCON1 register.

Once the read control bit is set, the program memory Flash controller will use the second instruction cycle to read the data. This causes the second instruction immediately following the “BSF PMCON1,RD” instruction to be ignored. The data is available in the very next cycle, in the PMDATH:PMDATL register pair; therefore, it can be read as two bytes in the following instructions.

PMDATH:PMDATL register pair will hold this value until another read or until it is written to by the user.

Note: The two instructions following a program

memory read are required to be NOPs. This prevents the user from executing a 2-cycle instruction on the next instruction after the RD bit is set.

FIGURE 10-1: FLASH PROGRAM

MEMORY READ FLOWCHART

DS40001607C-page 80  2011-2014 Microchip Technology Inc.

PIC16(L)F1503

Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4

BSF PMCON1,RD

executed here

INSTR(PC + 1)

executed here

PC + 1 PMADRH,PMADRL

PC+3

PC + 5

Flash ADDR

RD bit

PMDATH,PMDATL

PC + 3 PC + 4

INSTR (PC + 1)

INSTR(PC - 1)

executed here

INSTR(PC + 3)

executed here

INSTR(PC + 4)

executed here

Flash Data

PMDATH

PMDATL

INSTR (PC) INSTR (PC + 3) INSTR (PC + 4)

instruction ignored Forced NOP

INSTR(PC + 2)

executed here

instruction ignored Forced NOP

* This code block will read 1 word of program * memory at the memory address:

PROG_ADDR_HI : PROG_ADDR_LO * data will be returned in the variables; * PROG_DATA_HI, PROG_DATA_LO

BANKSEL PMADRL ; Select Bank for PMCON registers

MOVLW PROG_ADDR_LO ;

MOVWF PMADRL ; Store LSB of address

MOVLW PROG_ADDR_HI ;

MOVWF PMADRH ; Store MSB of address

BCF PMCON1,CFGS ; Do not select Configuration Space

BSF PMCON1,RD ; Initiate read

NOP ; Ignored (Figure 10-2)

MOVF PMDATL,W ; Get LSB of word

MOVWF PROG_DATA_LO ; Store in user location

MOVF PMDATH,W ; Get MSB of word

MOVWF PROG_DATA_HI ; Store in user location

FIGURE 10-2: FLASH PROGRAM MEMORY READ CYCLE EXECUTION

EXAMPLE 10-1: FLASH PROGRAM MEMORY READ

 2011-2014 Microchip Technology Inc. DS40001607C-page 81

PIC16(L)F1503

Start

Unlock Sequence

End

Unlock Sequence

Write 0x55 to

PMCON2

Write 0xAA to

PMCON2

Initiate

Write or Erase operation

(WR = 1)

Instruction fetched ignored

NOP execution forced

Instruction fetched ignored

NOP execution forced

Rev. 10-000047A

7/30/2013

10.2.2 FLASH MEMORY UNLOCK SEQUENCE

The unlock sequence is a mechanism that protects the Flash program memory from unintended self-write programming or erasing. The sequence must be executed and completed without interruption to successfully complete any of the following operations:

•Row Erase

• Load program memory write latches

• Write of program memory write latches to

program memory

• Write of program memory write latches to User

IDs

The unlock sequence consists of the following steps:

1. Write 55h to PMCON2

2. Write AAh to PMCON2

3. Set the WR bit in PMCON1

4. NOP instruction

5. NOP instruction

Once the WR bit is set, the processor will always force two NOP instructions. When an Erase Row or Program Row operation is being performed, the processor will stall internal operations (typical 2 ms), until the operation is complete and then resume with the next instruction. When the operation is loading the program memory write latches, the processor will always force the two NOP instructions and continue uninterrupted with the next instruction.

Since the unlock sequence must not be interrupted, global interrupts should be disabled prior to the unlock sequence and re-enabled after the unlock sequence is completed.

FIGURE 10-3: FLASH PROGRAM

MEMORY UNLOCK SEQUENCE FLOWCHART

DS40001607C-page 82  2011-2014 Microchip Technology Inc.

PIC16(L)F1503

Start

Erase Operation

End

Erase Operation

Disable Interrupts

(GIE = 0)

Select

Program or Configuration Memory

(CFGS)

Select Erase Operation

(FREE = 1)

Select Row Address

(PMADRH:PMADRL)

Enable Write/Erase Operation

(WREN = 1)

Unlock Sequence

(See Note 1)

Re-enable Interrupts

(GIE = 1)

Disable Write/Erase Operation

(WREN = 0)

CPU stalls while

Erase operation completes

(2 ms typical)

Rev. 10-000048A

7/30/2013

Note 1: See Figure 10-3.

10.2.3 ERASING FLASH PROGRAM MEMORY

While executing code, program memory can only be erased by rows. To erase a row:

1. Load the PMADRH:PMADRL register pair with

any address within the row to be erased.

2. Clear the CFGS bit of the PMCON1 register.

3. Set the FREE and WREN bits of the PMCON1

4. Write 55h, then AAh, to PMCON2 (Flash

programming unlock sequence).

5. Set control bit WR of the PMCON1 register to

begin the erase operation.

See Example 10-2.

After the “BSF PMCON1,WR” instruction, the processor requires two cycles to set up the erase operation. The user must place two NOP instructions immediately following the WR bit set instruction. The processor will halt internal operations for the typical 2 ms erase time. This is not Sleep mode as the clocks and peripherals will continue to run. After the erase cycle, the processor will resume operation with the third instruction after the PMCON1 write instruction.

FIGURE 10-4: FLASH PROGRAM

MEMORY ERASE FLOWCHART

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PIC16(L)F1503

; This row erase routine assumes the following: ; 1. A valid address within the erase row is loaded in ADDRH:ADDRL ; 2. ADDRH and ADDRL are located in shared data memory 0x70 - 0x7F (common RAM)

BCF INTCON,GIE ; Disable ints so required sequences will execute properly BANKSEL PMADRL MOVF ADDRL,W ; Load lower 8 bits of erase address boundary MOVWF PMADRL MOVF ADDRH,W ; Load upper 6 bits of erase address boundary MOVWF PMADRH BCF PMCON1,CFGS ; Not configuration space BSF PMCON1,FREE ; Specify an erase operation BSF PMCON1,WREN ; Enable writes

MOVLW 55h ; Start of required sequence to initiate erase MOVWF PMCON2 ; Write 55h MOVLW 0AAh ; MOVWF PMCON2 ; Write AAh BSF PMCON1,WR ; Set WR bit to begin erase NOP ; NOP instructions are forced as processor starts NOP ; row erase of program memory.

; ; The processor stalls until the erase process is complete ; after erase processor continues with 3rd instruction

BCF PMCON1,WREN ; Disable writes BSF INTCON,GIE ; Enable interrupts

Required

Sequence

EXAMPLE 10-2: ERASING ONE ROW OF PROGRAM MEMORY

DS40001607C-page 84  2011-2014 Microchip Technology Inc.

PIC16(L)F1503

10.2.4 WRITING TO FLASH PROGRAM MEMORY

Program memory is programmed using the following steps:

1. Load the address in PMADRH:PMADRL of the

row to be programmed.

2. Load each write latch with data.

3. Initiate a programming operation.

4. Repeat steps 1 through 3 until all data is written.

Before writing to program memory, the word(s) to be written must be erased or previously unwritten. Program memory can only be erased one row at a time. No automatic erase occurs upon the initiation of the write.

Program memory can be written one or more words at a time. The maximum number of words written at one time is equal to the number of write latches. See

Figure 10-5 (row writes to program memory with 16

write latches) for more details.

The write latches are aligned to the Flash row address boundary defined by the upper 10-bits of PMADRH:PMADRL, (PMADRH<6:0>:PMADRL<7:5>) with the lower five bits of PMADRL, (PMADRL<4:0>) determining the write latch being loaded. Write operations do not cross these boundaries. At the completion of a program memory write operation, the data in the write latches is reset to contain 0x3FFF.

The following steps should be completed to load the write latches and program a row of program memory. These steps are divided into two parts. First, each write latch is loaded with data from the PMDATH:PMDATL using the unlock sequence with LWLO = 1. When the last word to be loaded into the write latch is ready, the LWLO bit is cleared and the unlock sequence executed. This initiates the programming operation, writing all the latches into Flash program memory.

Note: The special unlock sequence is required

to load a write latch with data or initiate a Flash programming operation. If the unlock sequence is interrupted, writing to the latches or program memory will not be initiated.

1. Set the WREN bit of the PMCON1 register.

2. Clear the CFGS bit of the PMCON1 register.

3. Set the LWLO bit of the PMCON1 register. When the LWLO bit of the PMCON1 register is ‘1’, the write sequence will only load the write latches and will not initiate the write to Flash program memory.

4. Load the PMADRH:PMADRL register pair with the address of the location to be written.

5. Load the PMDATH:PMDATL register pair with the program memory data to be written.

6. Execute the unlock sequence (Section 10.2.2

“Flash Memory Unlock Sequence”). The write

latch is now loaded.

7. Increment the PMADRH:PMADRL register pair to point to the next location.

8. Repeat steps 5 through 7 until all but the last write latch has been loaded.

9. Clear the LWLO bit of the PMCON1 register. When the LWLO bit of the PMCON1 register is ‘0’, the write sequence will initiate the write to Flash program memory.

10. Load the PMDATH:PMDATL register pair with the program memory data to be written.

11. Execute the unlock sequence (Section 10.2.2

“Flash Memory Unlock Sequence”). The

entire program memory latch content is now written to Flash program memory.

Note: The program memory write latches are

reset to the blank state (0x3FFF) at the completion of every write or erase operation. As a result, it is not necessary to load all the program memory write latches. Unloaded latches will remain in the blank state.

An example of the complete write sequence is shown in

Example 10-3. The initial address is loaded into the

PMADRH:PMADRL register pair; the data is loaded using indirect addressing.

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 2011-2014 Microchip Technology Inc. DS40001607C-page 86

6 8

1414

Write Latch #15

0Fh

1414

Program Memory Write Latches

14 14 14

PMADRH<6:0>:

PMADRL<7:4>

Flash Program Memory

Row

Address

Decode

Addr

Write Latch #14

0Eh

Write Latch #1

01h

Write Latch #0

00h

Addr

Addr Addr

000h

000Fh

000Eh

0000h 0001h

001h 001Fh

001Eh

0010h 0011h

002h 002Fh002Eh0020h 0021h

7FEh

7FEFh7FEEh

7FE0h 7FE1h

7FFh 7FFFh7FFEh7FF0h 7FF1h

PMADRL<3:0>

800h 8009h - 801Fh8000h - 8003h

Configuration

Words

USER ID 0 - 3

8007h – 8008h8006h

DEVICE ID

Dev / Rev

reserved reserved

Configuration Memory

CFGS = 0

CFGS = 1

PMADRH PMADRL

76 07 43 0

c3 c2 c1 c0r9 r8 r7 r6 r5 r4 r3- r1 r0r2

PMDATH PMDATL

75 07 0

8004h – 8005h

411

Rev. 10-000004B

7/25/2013

FIGURE 10-5: BLOCK WRITES TO FLASH PROGRAM MEMORY WITH 16 WRITE LATCHES

PIC16(L)F1503

FIGURE 10-6: FLASH PROGRAM MEMORY WRITE FLOWCHART

Start

Write Operation

End

Write Operation

CPU stalls while Write

operation completes

(2 ms typical)

No delay when writing to

Program Memory Latches

Determine number of

words to be written into

Program or Configuration

Memory. The number of words cannot exceed the number of words per row

(word_cnt)

Last word to

write ?

Disable Interrupts

(GIE = 0)

Select

Program or Config.

Memory (CFGS)

Select Row Address

(PMADRH:PMADRL)

Select Write Operation

(FREE = 0)

Load Write Latches Only

(LWLO = 1)

Enable Write/Erase

Operation (WREN = 1)

Load the value to write

(PMDATH:PMDATL)

Update the word counter

(word_cnt--)

Unlock Sequence

(See Note 1)

Increment Address

(PMADRH:PMADRL++)

Write Latches to Flash

(LWLO = 0)

Unlock Sequence

(See Note 1)

Disable Write/Erase

Operation (WREN = 0)

Re-enable Interrupts

(GIE = 1)

Yes

Rev. 10-000049A

7/30/2013

Note 1: See Figure 10-3.

PIC16(L)F1503

 2011-2014 Microchip Technology Inc. DS40001607C-page 87

PIC16(L)F1503

; This write routine assumes the following: ; 1. 32 bytes of data are loaded, starting at the address in DATA_ADDR ; 2. Each word of data to be written is made up of two adjacent bytes in DATA_ADDR, ; stored in little endian format ; 3. A valid starting address (the least significant bits = 00000) is loaded in ADDRH:ADDRL ; 4. ADDRH and ADDRL are located in shared data memory 0x70 - 0x7F (common RAM) ;

BCF INTCON,GIE ; Disable ints so required sequences will execute properly BANKSEL PMADRH ; Bank 3 MOVF ADDRH,W ; Load initial address MOVWF PMADRH ; MOVF ADDRL,W ; MOVWF PMADRL ; MOVLW LOW DATA_ADDR ; Load initial data address MOVWF FSR0L ; MOVLW HIGH DATA_ADDR ; Load initial data address MOVWF FSR0H ; BCF PMCON1,CFGS ; Not configuration space BSF PMCON1,WREN ; Enable writes BSF PMCON1,LWLO ; Only Load Write Latches

LOOP

MOVIW FSR0++ ; Load first data byte into lower MOVWF PMDATL ; MOVIW FSR0++ ; Load second data byte into upper MOVWF PMDATH ;

MOVF PMADRL,W ; Check if lower bits of address are '00000' XORLW 0x0F ; Check if we're on the last of 16 addresses ANDLW 0x0F ; BTFSC STATUS,Z ; Exit if last of 16 words, GOTO START_WRITE ;

MOVLW 55h ; Start of required write sequence: MOVWF PMCON2 ; Write 55h MOVLW 0AAh ; MOVWF PMCON2 ; Write AAh BSF PMCON1,WR ; Set WR bit to begin write NOP ; NOP instructions are forced as processor

; loads program memory write latches

NOP ;

INCF PMADRL,F ; Still loading latches Increment address GOTO LOOP ; Write next latches

START_WRITE

BCF PMCON1,LWLO ; No more loading latches - Actually start Flash program

; memory write

MOVLW 55h ; Start of required write sequence: MOVWF PMCON2 ; Write 55h MOVLW 0AAh ; MOVWF PMCON2 ; Write AAh BSF PMCON1,WR ; Set WR bit to begin write NOP ; NOP instructions are forced as processor writes

; all the program memory write latches simultaneously

NOP ; to program memory.

; After NOPs, the processor ; stalls until the self-write process in complete

; after write processor continues with 3rd instruction BCF PMCON1,WREN ; Disable writes BSF INTCON,GIE ; Enable interrupts

Required

Sequence

EXAMPLE 10-3: WRITING TO FLASH PROGRAM MEMORY (16 WRITE LATCHES)

DS40001607C-page 88  2011-2014 Microchip Technology Inc.

PIC16(L)F1503

Start

Modify Operation

End

Modify Operation

Read Operation

(See Note 1)

An image of the entire row

read must be stored in RAM

Erase Operation

(See Note 2)

Modify Image

The words to be modified are

changed in the RAM image

Write Operation

Use RAM image

(See Note 3)

Rev. 10-000050A

7/30/2013

Note 1: See Figure 10-2.

2: See Figure 10-4.

3: See Figure 10-5.

10.3 Modifying Flash Program Memory

When modifying existing data in a program memory row, and data within that row must be preserved, it must first be read and saved in a RAM image. Program memory is modified using the following steps:

1. Load the starting address of the row to be modified.

2. Read the existing data from the row into a RAM image.

3. Modify the RAM image to contain the new data to be written into program memory.

4. Load the starting address of the row to be rewritten.

5. Erase the program memory row.

6. Load the write latches with data from the RAM image.

7. Initiate a programming operation.

FIGURE 10-7: FLASH PROGRAM

MEMORY MODIFY FLOWCHART

 2011-2014 Microchip Technology Inc. DS40001607C-page 89

PIC16(L)F1503

* This code block will read 1 word of program memory at the memory address: * PROG_ADDR_LO (must be 00h-08h) data will be returned in the variables; * PROG_DATA_HI, PROG_DATA_LO

BANKSEL PMADRL ; Select correct Bank MOVLW PROG_ADDR_LO ; MOVWF PMADRL ; Store LSB of address CLRF PMADRH ; Clear MSB of address

BSF PMCON1,CFGS ; Select Configuration Space BCF INTCON,GIE ; Disable interrupts BSF PMCON1,RD ; Initiate read NOP ; Executed (See Figure 10-2) NOP ; Ignored (See Figure 10-2) BSF INTCON,GIE ; Restore interrupts

MOVF PMDATL,W ; Get LSB of word MOVWF PROG_DATA_LO ; Store in user location MOVF PMDATH,W ; Get MSB of word MOVWF PROG_DATA_HI ; Store in user location

10.4 User ID, Device ID and Configuration Word Access

Instead of accessing program memory, the User ID’s, Device ID/Revision ID and Configuration Words can be accessed when CFGS = 1 in the PMCON1 register. This is the region that would be pointed to by PC<15> = 1, but not all addresses are accessible. Different access may exist for reads and writes. Refer to Tab le 1 0- 2.

When read access is initiated on an address outside the parameters listed in Tab le 1 0- 2, the PMDATH:PMDATL register pair is cleared, reading back ‘0’s.

TABLE 10-2: USER ID, DEVICE ID AND CONFIGURATION WORD ACCESS (CFGS = 1)

Address Function Read Access Write Access

8000h-8003h User IDs Yes Yes

8006h Device ID/Revision ID Yes No

8007h-8008h Configuration Words 1 and 2 Yes No

EXAMPLE 10-4: CONFIGURATION WORD AND DEVICE ID ACCESS

DS40001607C-page 90  2011-2014 Microchip Technology Inc.

10.5 Write Verify

Start

Verify Operation

This routine assumes that the last

rowofdatawrittenwasfroman

image saved on RAM. This image

will be used to verify the data

currently stored in Flash Program

Memory

Fail

Verify Operation

Last word ?

PMDAT =

RAM image ?

Read Operation

(See Note 1)

End

Verify Operation

Yes

Rev. 10-000051A

7/30/2013

Note 1: See Figure 10-2.

It is considered good programming practice to verify that program memory writes agree with the intended value. Since program memory is stored as a full page then the stored program memory contents are compared with the intended data stored in RAM after the last write is complete.

FIGURE 10-8: FLASH PROGRAM

MEMORY VERIFY FLOWCHART

PIC16(L)F1503

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PIC16(L)F1503

10.6 Register Definitions: Flash Program Memory Control

REGISTER 10-1: PMDATL: PROGRAM MEMORY DATA LOW BYTE REGISTER

R/W-x/u R/W-x/u R/W-x/u R/W-x/u R/W-x/u R/W-x/u R/W-x/u R/W-x/u

PMDAT<7:0>

bit 7 bit 0

Legend:

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

u = Bit is unchanged x = Bit is unknown -n/n = Value at POR and BOR/Value at all other Resets

‘1’ = Bit is set ‘0’ = Bit is cleared

bit 7-0 PMDAT<7:0>: Read/write value for Least Significant bits of program memory

REGISTER 10-2: PMDATH: PROGRAM MEMORY DATA HIGH BYTE REGISTER

U-0 U-0 R/W-x/u R/W-x/u R/W-x/u R/W-x/u R/W-x/u R/W-x/u

— — PMDAT<13:8>

bit 7 bit 0

Legend:

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

u = Bit is unchanged x = Bit is unknown -n/n = Value at POR and BOR/Value at all other Resets

‘1’ = Bit is set ‘0’ = Bit is cleared

bit 7-6 Unimplemented: Read as ‘0’

bit 5-0 PMDAT<13:8>: Read/write value for Most Significant bits of program memory

REGISTER 10-3: PMADRL: PROGRAM MEMORY ADDRESS LOW BYTE REGISTER

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

PMADR<7:0>

bit 7 bit 0

Legend:

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

u = Bit is unchanged x = Bit is unknown -n/n = Value at POR and BOR/Value at all other Resets

‘1’ = Bit is set ‘0’ = Bit is cleared

bit 7-0 PMADR<7:0>: Specifies the Least Significant bits for program memory address

REGISTER 10-4: PMADRH: PROGRAM MEMORY ADDRESS HIGH BYTE REGISTER

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

(1)

—

bit 7 bit 0

Legend:

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

u = Bit is unchanged x = Bit is unknown -n/n = Value at POR and BOR/Value at all other Resets

‘1’ = Bit is set ‘0’ = Bit is cleared

PMADR<14:8>

bit 7 Unimplemented: Read as ‘1’

bit 6-0 PMADR<14:8>: Specifies the Most Significant bits for program memory address

Note 1: Unimplemented, read as ‘1’.

DS40001607C-page 92  2011-2014 Microchip Technology Inc.

PIC16(L)F1503

REGISTER 10-5: PMCON1: PROGRAM MEMORY CONTROL 1 REGISTER

U-1 R/W-0/0 R/W-0/0 R/W/HC-0/0 R/W/HC-x/q

(1)

—

bit 7 bit 0

Legend:

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

S = Bit can only be set x = Bit is unknown -n/n = Value at POR and BOR/Value at all other Resets

‘1’ = Bit is set ‘0’ = Bit is cleared HC = Bit is cleared by hardware

bit 7 Unimplemented: Read as ‘1’

bit 6 CFGS: Configuration Select bit

bit 5 LWLO: Load Write Latches Only bit

bit 4 FREE: Program Flash Erase Enable bit

bit 3 WRERR: Program/Erase Error Flag bit

bit 2 WREN: Program/Erase Enable bit

bit 1 WR: Write Control bit

bit 0 RD: Read Control bit

Note 1: Unimplemented bit, read as ‘1’.

2: The WRERR bit is automatically set by hardware when a program memory write or erase operation is started (WR = 1). 3: The LWLO bit is ignored during a program memory erase operation (FREE = 1).

CFGS LWLO FREE WRERR WREN WR RD

1 = Access Configuration, User ID and Device ID Registers 0 = Access Flash program memory

(3)

1 = Only the addressed program memory write latch is loaded/updated on the next WR command 0 = The addressed program memory write latch is loaded/updated and a write of all program memory write latches

will be initiated on the next WR command

1 = Performs an erase operation on the next WR command (hardware cleared upon completion) 0 = Performs a write operation on the next WR command

1 = Condition indicates an improper program or erase sequence attempt or termination (bit is set automatically

on any set attempt (write ‘1’) of the WR bit).

0 = The program or erase operation completed normally.

1 = Allows program/erase cycles 0 = Inhibits programming/erasing of program Flash

1 = Initiates a program Flash program/erase operation.

The operation is self-timed and the bit is cleared by hardware once operation is complete. The WR bit can only be set (not cleared) in software.

0 = Program/erase operation to the Flash is complete and inactive.

1 = Initiates a program Flash read. Read takes one cycle. RD is cleared in hardware. The RD bit can only be set

(not cleared) in software.

0 = Does not initiate a program Flash read.

(2)

R/W-0/0 R/S/HC-0/0 R/S/HC-0/0

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PIC16(L)F1503

REGISTER 10-6: PMCON2: PROGRAM MEMORY CONTROL 2 REGISTER

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

Program Memory Control Register 2

bit 7 bit 0

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ S = Bit can only be set x = Bit is unknown -n/n = Value at POR and BOR/Value at all other Resets ‘1’ = Bit is set ‘0’ = Bit is cleared

bit 7-0 Flash Memory Unlock Pattern bits

To unlock writes, a 55h must be written first, followed by an AAh, before setting the WR bit of the PMCON1 register. The value written to this register is used to unlock the writes. There are specific timing requirements on these writes.

TABLE 10-3: SUMMARY OF REGISTERS ASSOCIATED WITH FLASH PROGRAM MEMORY

Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

INTCON GIE PEIE

PMCON1

PMCON2 Program Memory Control Register 2

PMADRL PMADRL<7:0>

PMADRH

PMDATL PMDATL<7:0>

PMDATH

Legend: — = unimplemented location, read as ‘0’. Shaded cells are not used by Flash program memory. Note 1: Unimplemented, read as ‘1’.

(1)

—

(1)

—

— —PMDATH<5:0>92

CFGS LWLO FREE WRERR WREN WR RD

TMR0IE INTE IOCIE TMR0IF INTF IOCIF

PMADRH<6:0> 92

TABLE 10-4: SUMMARY OF CONFIGURATION WORD WITH RESETS

Name Bits Bit -/7 Bit -/6 Bit 13/5 Bit 12/4 Bit 11/3 Bit 10/2 Bit 9/1 Bit 8/0

CONFIG1

CONFIG2

Legend: — = unimplemented location, read as ‘0’. Shaded cells are not used by Resets.

13:8

7:0 CP

13:8

7:0

— — — — CLKOUTEN BOREN<1:0> —

MCLRE PWRTE WDTE<1:0> — FOSC<1:0>

— — LV P DEBUG LPBOR BORV STVREN —

— — — — — —WRT<1:0>

Page

DS40001607C-page 94  2011-2014 Microchip Technology Inc.

PIC16(L)F1503

Write LATx Write PORTx

Data bus

Read PORTx

To digital peripherals

To analog peripherals

Data Register

TRISx

VSS

I/O pin

ANSELx

Read LATx

VDD

Rev. 10-000052A

7/30/2013

11.0 I/O PORTS

Each port has three standard registers for its operation. These registers are:

• TRISx registers (data direction)

• PORTx registers (reads the levels on the pins of the device)

• LATx registers (output latch)

Some ports may have one or more of the following additional registers. These registers are:

• ANSELx (analog select)

• WPUx (weak pull-up)

In general, when a peripheral is enabled on a port pin, that pin cannot be used as a general purpose output. However, the pin can still be read.

TABLE 11-1: PORT AVAILABILITY PER

DEVICE

Device

PORTB

PORTC

PORTA

PIC16(L)F1503 ●●

The Data Latch (LATx registers) is useful for read-modify-write operations on the value that the I/O pins are driving.

A write operation to the LATx register has the same effect as a write to the corresponding PORTx register. A read of the LATx register reads of the values held in the I/O PORT latches, while a read of the PORTx register reads the actual I/O pin value.

Ports that support analog inputs have an associated ANSELx register. When an ANSEL bit is set, the digital input buffer associated with that bit is disabled. Disabling the input buffer prevents analog signal levels on the pin between a logic high and low from causing excessive current in the logic input circuitry. A simplified model of a generic I/O port, without the interfaces to other peripherals, is shown in Figure 11-1.

FIGURE 11-1: GENERIC I/O PORT

OPERATION

 2011-2014 Microchip Technology Inc. DS40001607C-page 95

PIC16(L)F1503

11.1 Alternate Pin Function

The Alternate Pin Function Control (APFCON) register is used to steer specific peripheral input and output functions between different pins. The APFCON register is shown in Register 11-1. For this device family, the following functions can be moved between different pins.

•

•T1G

•CLC1

• NCO1

• SDOSEL

These bits have no effect on the values of any TRIS register. PORT and TRIS overrides will be routed to the correct pin. The unselected pin will be unaffected.

11.2 Register Definitions: Alternate Pin Function Control

REGISTER 11-1: APFCON: ALTERNATE PIN FUNCTION CONTROL REGISTER

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

— —

bit 7 bit 0

Legend:

SDOSEL SSSEL T1GSEL

—

CLC1SEL NCO1SEL

bit 7-6 Unimplemented: Read as ‘0’ bit 5 SDOSEL: Pin Selection bit

1 = SDO function is on RA4 0 = SDO function is on RC2

bit 4 SSSEL: Pin Selection bit

1 =SS 0 =SS

bit 3 T1GSEL: Pin Selection bit

1 = T1G function is on RA3 0 = T1G function is on RA4

bit 2 Unimplemented: Read as ‘0’ bit 1 CLC1SEL: Pin Selection bit

1 = CLC1 function is on RC5 0 = CLC1 function is on RA2

bit 0 NCO1SEL: Pin Selection bit

1 = NCO1 function is on RA4 0 = NCO1 function is on RC1

function is on RA3 function is on RC3

DS40001607C-page 96  2011-2014 Microchip Technology Inc.

PIC16(L)F1503

BANKSEL PORTA ; CLRF PORTA ;Init PORTA BANKSEL LATA ;Data Latch CLRF LATA ; BANKSEL ANSELA ; CLRF ANSELA ;digital I/O BANKSEL TRISA ; MOVLW B'00111000' ;Set RA<5:3> as inputs MOVWF TRISA ;and set RA<2:0> as

;outputs

11.3 PORTA Registers

11.3.1 DATA REGISTER

PORTA is a 6-bit wide, bidirectional port. The corresponding data direction register is TRISA (Register 11-3). Setting a TRISA bit (= 1) will make the corresponding PORTA pin an input (i.e., disable the output driver). Clearing a TRISA bit (= 0) will make the corresponding PORTA pin an output (i.e., enables output driver and puts the contents of the output latch on the selected pin). The exception is RA3, which is input-only and its TRIS bit will always read as ‘1’.

Example 11-1 shows how to initialize an I/O port.

Reading the PORTA register (Register 11-2) reads the status of the pins, whereas writing to it will write to the PORT latch. All write operations are read-modify-write operations. Therefore, a write to a port implies that the port pins are read, this value is modified and then written to the PORT data latch (LATA).

11.3.2 DIRECTION CONTROL

The TRISA register (Register 11-3) controls the PORTA pin output drivers, even when they are being used as analog inputs. The user should ensure the bits in the TRISA register are maintained set when using them as analog inputs. I/O pins configured as analog input always read ‘0’.

11.3.3 ANALOG CONTROL

The ANSELA register (Register 11-5) is used to configure the Input mode of an I/O pin to analog. Setting the appropriate ANSELA bit high will cause all digital reads on the pin to be read as ‘0’ and allow analog functions on the pin to operate correctly.

The state of the ANSELA bits has no effect on digital output functions. A pin with TRIS clear and ANSEL set will still operate as a digital output, but the Input mode will be analog. This can cause unexpected behavior when executing read-modify-write instructions on the affected port.

11.3.4 PORTA FUNCTIONS AND OUTPUT PRIORITIES

Each PORTA pin is multiplexed with other functions. The pins, their combined functions and their output priorities are shown in Table 11-2.

When multiple outputs are enabled, the actual pin control goes to the peripheral with the highest priority.

Analog input functions, such as ADC and comparator inputs, are not shown in the priority lists. These inputs are active when the I/O pin is set for Analog mode using the ANSELx registers. Digital output functions may control the pin when it is in Analog mode with the priority shown below in Table 11-2.

TABLE 11-2: PORTA OUTPUT PRIORITY

Pin Name Function Priority

RA0 ICSPDAT

RA1 RA1

RA2 DACOUT2

RA3 None

RA4 CLKOUT

RA5 RA5

Note 1: Priority listed from highest to lowest.

2: Default pin (see APFCON register). 3: Alternate pin (see APFCON register).

DACOUT1 RA0

CLC1 C1OUT PWM3 RA2

NCO1

(3)

SDO RA4

(1)

(2)

(3)

Note: The ANSELA bits default to the Analog

mode after Reset. To use any pins as digital general purpose or peripheral inputs, the corresponding ANSEL bits must be initialized to ‘0’ by user software.

EXAMPLE 11-1: INITIALIZING PORTA

 2011-2014 Microchip Technology Inc. DS40001607C-page 97

PIC16(L)F1503

11.4 Register Definitions: PORTA

REGISTER 11-2: PORTA: PORTA REGISTER

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

— — RA5 RA4 RA3 RA2 RA1 RA0

bit 7 bit 0

Legend:

bit 7-6 Unimplemented: Read as ‘0’ bit 5-0 RA<5:0>: PORTA I/O Value bits

1 = Port pin is > VIH 0 = Port pin is < VIL

Note 1: Writes to PORTA are actually written to corresponding LATA register. Reads from PORTA register is return

of actual I/O pin values.

(1)

REGISTER 11-3: TRISA: PORTA TRI-STATE REGISTER

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

— — TRISA5 TRISA4 —

bit 7 bit 0

Legend:

bit 7-6 Unimplemented: Read as ‘0’ bit 5-4 TRISA<5:4>: PORTA Tri-State Control bit

1 = PORTA pin configured as an input (tri-stated) 0 = PORTA pin configured as an output

bit 3 Unimplemented: Read as ‘1’ bit 2-0 TRISA<2:0>: PORTA Tri-State Control bit

1 = PORTA pin configured as an input (tri-stated) 0 = PORTA pin configured as an output

Note 1: Unimplemented, read as ‘1’.

(1)

TRISA2 TRISA1 TRISA0

DS40001607C-page 98  2011-2014 Microchip Technology Inc.

PIC16(L)F1503

REGISTER 11-4: LATA: PORTA DATA LATCH REGISTER

U-0 U-0 R/W-x/u R/W-x/u U-0 R/W-x/u R/W-x/u R/W-x/u

— —LATA5LATA4— L ATA2 LATA 1 LATA0

bit 7 bit 0

Legend:

bit 7-6 Unimplemented: Read as ‘0’ bit 5-4 LATA<5:4>: RA<5:4> Output Latch Value bits bit 3 Unimplemented: Read as ‘0’ bit 2-0 LATA<2:0>: RA<2:0> Output Latch Value bits

Note 1: Writes to PORTA are actually written to corresponding LATA register. Reads from PORTA register is return

of actual I/O pin values.

REGISTER 11-5: ANSELA: PORTA ANALOG SELECT REGISTER

(1)

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

— — — ANSA4 — ANSA2 ANSA1 ANSA0

bit 7 bit 0

Legend:

bit 7-5 Unimplemented: Read as ‘0’ bit 4 ANSA4: Analog Select between Analog or Digital Function on pins RA4, respectively

1 = Analog input. Pin is assigned as analog input 0 = Digital I/O. Pin is assigned to port or digital special function.

bit 3 Unimplemented: Read as ‘0’ bit 2-0 ANSA<2:0>: Analog Select between Analog or Digital Function on pins RA<2:0>, respectively

1 = Analog input. Pin is assigned as analog input 0 = Digital I/O. Pin is assigned to port or digital special function.

Note 1: When setting a pin to an analog input, the corresponding TRIS bit must be set to Input mode in order to

allow external control of the voltage on the pin.

(1)

. Digital input buffer disabled.

(1)

. Digital input buffer disabled.

 2011-2014 Microchip Technology Inc. DS40001607C-page 99

PIC16(L)F1503

REGISTER 11-6: WPUA: WEAK PULL-UP PORTA REGISTER

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

— — WPUA5 WPUA4 WPUA3 WPUA2 WPUA1 WPUA0

bit 7 bit 0

Legend:

bit 7-6 Unimplemented: Read as ‘0’ bit 5-0 WPUA<5:0>: Weak Pull-up Register bits

1 = Pull-up enabled 0 = Pull-up disabled

(3)

Note 1: Global WPUEN

bit of the OPTION_REG register must be cleared for individual pull-ups to be enabled.

2: The weak pull-up device is automatically disabled if the pin is configured as an output. 3: For the WPUA3 bit, when MCLRE = 1, weak pull-up is internally enabled, but not reported here.

TABLE 11-3: SUMMARY OF REGISTERS ASSOCIATED WITH PORTA

Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

ANSELA

APFCON

LATA

OPTION_REG

PORTA

TRISA

WPUA

Legend: x = unknown, u = unchanged, – = unimplemented locations read as ‘0’. Shaded cells are not used by PORTA. Note 1: Unimplemented, read as ‘1’.

— — —ANSA4 — ANSA2 ANSA1 ANSA0 99

— —

— —LATA5LATA4— LATA2 LATA1 LATA0 99

WPUEN INTEDG TMR0CS TMR0SE PSA PS<2:0> 139

— — RA5 RA4 RA3 RA2 RA1 RA0 98

— — TRISA5 TRISA4 —

— — WPUA5 WPUA4 WPUA3 WPUA2 WPUA1 WPUA0 100

SDOSEL SSSEL

T1GSEL

(1)

—

TRISA2 TRISA1 TRISA0 98

CLC1SEL NCO1SEL 96

TABLE 11-4: SUMMARY OF CONFIGURATION WORD WITH PORTA

Name Bits Bit -/7 Bit -/6 Bit 13/5 Bit 12/4 Bit 11/3 Bit 10/2 Bit 9/1 Bit 8/0

CONFIG1

Legend: — = unimplemented location, read as ‘0’. Shaded cells are not used by PORTA.

13:8

7:0

— — — —CLKOUTEN BOREN<1:0> —

CP MCLRE PWRTE WDTE<1:0>

— FOSC<1:0>

on Page

DS40001607C-page 100  2011-2014 Microchip Technology Inc.

Datasheet PIC16LF1503, PIC16F1503 Datasheet

Specifications and Main Features

Frequently Asked Questions

User Manual

14-Pin Flash, 8-Bit Microcontrollers

PIC12(L)F1501/PIC16(L)F150X FAMILY TYPES

PIN DIAGRAMS

PIN ALLOCATION TABLE

TABLE 1: 14-PIN ALLOCATION TABLE (PIC16(L)F1503)

TABLE OF CONTENTS

1.0 DEVICE OVERVIEW

TABLE 1-1: DEVICE PERIPHERAL SUMMARY

FIGURE 1-1: PIC16(L)F1503 BLOCK DIAGRAM

TABLE 1-2: PIC16(L)F1503 PINOUT DESCRIPTION

2.0 ENHANCED MID-RANGE CPU

FIGURE 2-1: CORE BLOCK DIAGRAM

2.1 Automatic Interrupt Context Saving

2.2 16-Level Stack with Overflow and Underflow

2.3 File Select Registers

2.4 Instruction Set

3.0 MEMORY ORGANIZATION

3.1 Program Memory Organization

TABLE 3-1: DEVICE SIZES AND ADDRESSES

EXAMPLE 3-1: RETLW INSTRUCTION

3.2 Data Memory Organization

TABLE 3-2: CORE REGISTERS

REGISTER 3-1: STATUS: STATUS REGISTER

TABLE 3-3: PIC16(L)F1503 MEMORY MAP

TABLE 3-3: PIC16(L)F1503 MEMORY MAP (CONTINUED)

TABLE 3-3: PIC16(L)F1503 MEMORY MAP (CONTINUED)

TABLE 3-3: PIC16(L)F1503 MEMORY MAP (CONTINUED)

TABLE 3-4: CORE FUNCTION REGISTERS SUMMARY

TABLE 3-5: SPECIAL FUNCTION REGISTER SUMMARY

3.3 PCL and PCLATH

3.4 Stack

FIGURE 3-4: ACCESSING THE STACK EXAMPLE 1

FIGURE 3-5: ACCESSING THE STACK EXAMPLE 2

FIGURE 3-6: ACCESSING THE STACK EXAMPLE 3

FIGURE 3-7: ACCESSING THE STACK EXAMPLE 4

3.5 Indirect Addressing

FIGURE 3-8: INDIRECT ADDRESSING

FIGURE 3-9: TRADITIONAL DATA MEMORY MAP

4.0 DEVICE CONFIGURATION

4.1 Configuration Words

4.2 Register Definitions: Configuration Words

REGISTER 4-1: CONFIG1: CONFIGURATION WORD 1

REGISTER 4-2: CONFIG2: CONFIGURATION WORD 2

4.3 Code Protection

4.4 Write Protection

4.5 User ID

4.6 Device ID and Revision ID

4.7 Register Definitions: Device ID

REGISTER 4-3: DEVID: DEVICE ID REGISTER

5.0 OSCILLATOR MODULE

5.1 Overview

FIGURE 5-1: SIMPLIFIED PIC® MCU CLOCK SOURCE BLOCK DIAGRAM

5.2 Clock Source Types

FIGURE 5-3: INTERNAL OSCILLATOR SWITCH TIMING

5.3 Clock Switching

TABLE 5-2: OSCILLATOR SWITCHING DELAYS

5.4 Register Definitions: Oscillator Control

REGISTER 5-1: OSCCON: OSCILLATOR CONTROL REGISTER

REGISTER 5-2: OSCSTAT: OSCILLATOR STATUS REGISTER

TABLE 5-3: SUMMARY OF REGISTERS ASSOCIATED WITH CLOCK SOURCES

TABLE 5-4: SUMMARY OF CONFIGURATION WORD WITH CLOCK SOURCES

6.0 RESETS

FIGURE 6-1: SIMPLIFIED BLOCK DIAGRAM OF ON-CHIP RESET CIRCUIT

6.1 Power-On Reset (POR)

6.2 Brown-Out Reset (BOR)

TABLE 6-1: BOR OPERATING MODES

FIGURE 6-2: BROWN-OUT SITUATIONS

6.3 Register Definitions: BOR Control

REGISTER 6-1: BORCON: BROWN-OUT RESET CONTROL REGISTER

6.4 Low-Power Brown-Out Reset (LPBOR)

6.5 MCLR

TABLE 6-2: MCLR CONFIGURATION

6.6 Watchdog Timer (WDT) Reset

6.7 RESET Instruction

6.8 Stack Overflow/Underflow Reset

6.9 Programming Mode Exit