Microchip Technology PIC16F87XA Manuel utilisateur

2003 Microchip Technology Inc. DS39582B

PIC16F87XA

Data Sheet

28/40/44-Pin Enhanced Flash

Microcontrollers

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Information contained in this publication regarding device

applications and the like is intended through suggestion only

and may be superseded by updates. It is your responsibility to

ensure that your application meets with your specifications.

No representation or warranty is given and no liability is

assumed by Microchip Technology Incorporated with respect

to the accuracy or use of such information, or infringement of

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property rights.

Trademarks

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

dsPIC, KEELOQ, MPLAB, PIC, PICmicro, PICSTART,

PRO MATE and PowerSmart are registered trademarks of

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countries.

AmpLab, FilterLab, microID, MXDEV, MXLAB, PICMASTER,

SEEVAL and The Embedded Control Solutions Company are

registered trademarks of Microchip Technology Incorporated

in the U.S.A.

Application Maestro, dsPICDEM, dsPICDEM.net, ECAN,

ECONOMONITOR, FanSense, FlexROM, fuzzyLAB,

In-Circuit Serial Programming, ICSP, ICEPIC, microPort,

Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM,

PICkit, PICDEM, PICDEM.net, PowerCal, PowerInfo,

PowerMate, PowerTool, rfLAB, rfPIC, Select Mode,

SmartSensor, SmartShunt, SmartTel and Total Endurance are

trademarks of Microchip Technology Incorporated in the

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Serialized Quick Turn Programming (SQTP) is a service mark

of Microchip Technology Incorporated in the U.S.A.

All other trademarks mentioned herein are property of their

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Printed on recycled paper.

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

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

• Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the

intended manner and under normal conditions.

• There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our

knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip's Data

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

• Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not

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Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our

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Microchip received QS-9000 quality system

certification for its worldwide headquarters,

design and wafer fabrication facilities in

Chandler and Tempe, Arizona in July 1999

and Mountain View, California in March 2002.

The Company’s quality system processes and

procedures are QS-9000 compliant for its

PICmicro®8-bit MCUs, KEELOQ®code hopping

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non-volatile memory and analog products. In

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PIC16F87XA

Devices Included in this Data Sheet:

High-Performance RISC CPU:

• Only 35 single-word instructions to learn

• All single-cycle instructions except for program

branches, which are two-cycle

• Operating speed: DC – 20 MHz clock input

DC – 200 ns instruction cycle

• Up to 8K x 14 words of Flash Program Memory,

Up to 368 x 8 bytes of Data Memory (RAM),

Up to 256 x 8 bytes of EEPROM Data Memory

• Pinout compatible to other 28-pin or 40/44-pin

PIC16CXXX and PIC16FXXX microcontrollers

Peripheral Features:

• Timer0: 8-bit timer/counter with 8-bit prescaler

• Timer1: 16-bit timer/counter with prescaler,

can be incremented during Sleep via external

crystal/clock

• Timer2: 8-bit timer/counter with 8-bit period

• Two Capture, Compare, PWM modules

- Capture is 16-bit, max. resolution is 12.5 ns

- Compare is 16-bit, max. resolution is 200 ns

- PWM max. resolution is 10-bit

• Synchronous Serial Port (SSP) with SPI™

(Master mode) and I2C™(Master/Slave)

• Universal Synchronous Asynchronous Receiver

Transmitter (USART/SCI) with 9-bit address

detection

• Parallel Slave Port (PSP) – 8 bits wide with

external RD, WR and CS controls (40/44-pin only)

• Brown-out detection circuitry for

Brown-out Reset (BOR)

Analog Features:

• 10-bit, up to 8-channel Analog-to-Digital

Converter (A/D)

• Brown-out Reset (BOR)

• Analog Comparator module with:

- Two analog comparators

- Programmable on-chip voltage reference

(VREF) module

- Programmable input multiplexing fromdevice

inputs and internal voltage reference

- Comparator outputs are externally accessible

Special Microcontroller Features:

• 100,000 erase/write cycle Enhanced Flash

program memory typical

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

memory typical

• Data EEPROM Retention > 40 years

• Self-reprogrammable under software control

• In-Circuit Serial Programming™ (ICSP™)

via two pins

• Single-supply 5V In-Circuit Serial Programming

• Watchdog Timer (WDT) with its own on-chip RC

oscillator for reliable operation

• Programmable code protection

• Power saving Sleep mode

• Selectable oscillator options

• In-Circuit Debug (ICD) via two pins

CMOS Technology:

• Low-power, high-speed Flash/EEPROM

technology

• Fully static design

• Wide operating voltage range (2.0V to 5.5V)

• Commercial and Industrial temperature ranges

• Low-power consumption

• PIC16F873A

• PIC16F874A •PIC16F876A

•PIC16F877A

Device

Program Memory Data

SRAM

(Bytes)

EEPROM

(Bytes) I/O 10-bit

A/D (ch) CCP

(PWM)

MSSP

USART Timers

8/16-bit Comparators

Bytes # Single Word

Instructions SPI Master

I2C

PIC16F873A 7.2K 4096 192 128 22 5 2 Yes Yes Yes 2/1 2

PIC16F874A 7.2K 4096 192 128 33 8 2 Yes Yes Yes 2/1 2

PIC16F876A 14.3K 8192 368 256 22 5 2 Yes Yes Yes 2/1 2

PIC16F877A 14.3K 8192 368 256 33 8 2 Yes Yes Yes 2/1 2

28/40/44-Pin Enhanced Flash Microcontrollers

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Pin Diagrams

PIC16F873A/876A

14 15

MCLR/VPP

RA0/AN0

RA1/AN1

RA2/AN2/VREF-/CVREF

RA3/AN3/VREF+

RA4/T0CKI/C1OUT

RA5/AN4/SS/C2OUT

VSS

OSC1/CLKI

OSC2/CLKO

RC0/T1OSO/T1CKI

RC1/T1OSI/CCP2

RC2/CCP1

RC3/SCK/SCL

RB7/PGD

RB6/PGC

RB5

RB4

RB3/PGM

RB2

RB1

RB0/INT

VDD

VSS

RC7/RX/DT

RC6/TX/CK

RC5/SDO

RC4/SDI/SDA

28-Pin PDIP, SOIC, SSOP

MCLR/VPP

RA2/AN2/VREF-/CVREF

RA3/AN3/VREF+

RA4/T0CKI/C1OUT

RA5/AN4/SS/C2OUT

VSS

OSC1/CLKI 15

21 RB3/PGM

VDD

VSS

RB0/INT

RC7/RX/DT

RC1/T1OSI/CCP2

RC2/CCP1

RC3/SCK/SCL

RC4/SDI/SDA

RC5/SDO

RC6/TX/CK 23

RA1/AN1

RA0/AN0

RB7/PGD

RB6/PGC

RB5

RB4

28-Pin QFN

PIC16F873A

PIC16F876A

RB2

RB1

RC0/T1OSO/T1CKI

OSC2/CLKO

PIC16F874A

RA3/AN3/VREF+

RA2/AN2/VREF-/CVREF

RA1/AN1

RA0/AN0

MCLR/VPP

RB3/PGM

RB7/PGD

RB6/PGC

RB5

RB4

NC RC6/TX/CK

RC5/SDO

RC4/SDI/SDA

RD3/PSP3

RD2/PSP2

RD1/PSP1

RD0/PSP0

RC3/SCK/SCL

RC2/CCP1

RC1/T1OSI/CCP2

RC0/T1OSO/T1CKI

OSC2/CLKO

OSC1/CLKI

VSS

VDD

RE2/CS/AN7

RE1/WR/AN6

RE0/RD/AN5

RA5/AN4/SS/C2OUT

RA4/T0CKI/C1OUT

RC7/RX/DT

RD4/PSP4

RD5/PSP5

RD6/PSP6

RD7/PSP7

VSS

VDD

RB0/INT

RB1

RB2

44-Pin QFN

PIC16F877A

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PIC16F87XA

Pin Diagrams (Continued)

RB7/PGD

RB6/PGC

RB5

RB4

RB3/PGM

RB2

RB1

RB0/INT

VDD

VSS

RD7/PSP7

RD6/PSP6

RD5/PSP5

RD4/PSP4

RC7/RX/DT

RC6/TX/CK

RC5/SDO

RC4/SDI/SDA

RD3/PSP3

RD2/PSP2

MCLR/VPP

RA0/AN0

RA1/AN1

RA2/AN2/VREF-/CVREF

RA3/AN3/VREF+

RA4/T0CKI/C1OUT

RA5/AN4/SS/C2OUT

RE0/RD/AN5

RE1/WR/AN6

RE2/CS/AN7

VDD

VSS

OSC1/CLKI

OSC2/CLKO

RC0/T1OSO/T1CKI

RC1/T1OSI/CCP2

RC2/CCP1

RC3/SCK/SCL

RD0/PSP0

RD1/PSP1

PIC16F874A/877A

40-Pin PDIP

PIC16F874A

RA4/T0CKI/C1OUT

RA5/AN4/SS/C2OUT

RE0/RD/AN5

OSC1/CLKI

OSC2/CLKO

RC0/T1OSO/T1CK1

RE1/WR/AN6

RE2/CS/AN7

VDD

VSS

RB3/PGM

RB2

RB1

RB0/INT

VDD

VSS

RD7/PSP7

RD6/PSP6

RD5/PSP5

RD4/PSP4

RA3/AN3/VREF+

RA2/AN2/VREF-/CVREF

RA1/AN1

RA0/AN0

MCLR/VPP

RB7/PGD

RB6/PGC

RB5

RB4

RC6/TX/CK

RC5/SDO

RC4/SDI/SDA

RD3/PSP3

RD2/PSP2

RD1/PSP1

RD0/PSP0

RC3/SCK/SCL

RC2/CCP1

RC1/T1OSI/CCP2

PIC16F874A

RA3/AN3/VREF+

RA2/AN2/VREF-/CVREF

RA1/AN1

RA0/AN0

MCLR/VPP

RB7/PGD

RB6/PGC

RB5

RB4

NC RC6/TX/CK

RC5/SDO

RC4/SDI/SDA

RD3/PSP3

RD2/PSP2

RD1/PSP1

RD0/PSP0

RC3/SCK/SCL

RC2/CCP1

RC1/T1OSI/CCP2

RC0/T1OSO/T1CKI

OSC2/CLKO

OSC1/CLKI

VSS

VDD

RE2/CS/AN7

RE1/WR/AN6

RE0/RD/AN5

RA5/AN4/SS/C2OUT

RA4/T0CKI/C1OUT

RC7/RX/DT

RD4/PSP4

RD5/PSP5

RD6/PSP6

RD7/PSP7

VSS

VDD

RB0/INT

RB1

RB2

RB3/PGM

44-Pin PLCC

44-Pin TQFP

PIC16F877A

RC7/RX/DT

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DS39582B-page 4 2003 Microchip Technology Inc.

Table of Contents

1.0 Device Overview......................................................................................................................................................................... 5

2.0 Memory Organization................................................................................................................................................................ 15

3.0 Data EEPROM and Flash Program Memory............................................................................................................................ 33

4.0 I/O Ports.................................................................................................................................................................................... 41

5.0 Timer0 Module.......................................................................................................................................................................... 53

6.0 Timer1 Module.......................................................................................................................................................................... 57

7.0 Timer2 Module.......................................................................................................................................................................... 61

8.0 Capture/Compare/PWM Modules............................................................................................................................................. 63

9.0 Master Synchronous Serial Port (MSSP) Module..................................................................................................................... 71

10.0 Addressable Universal Synchronous Asynchronous Receiver Transmitter (USART)............................................................ 111

11.0 Analog-to-Digital Converter (A/D) Module .............................................................................................................................. 127

12.0 Comparator Module................................................................................................................................................................ 135

13.0 Comparator Voltage Reference Module ................................................................................................................................. 141

14.0 Special Features of the CPU.................................................................................................................................................. 143

15.0 Instruction Set Summary......................................................................................................................................................... 159

16.0 Development Support............................................................................................................................................................. 167

17.0 Electrical Characteristics......................................................................................................................................................... 173

18.0 DC and AC Characteristics Graphs and Tables ..................................................................................................................... 197

19.0 Packaging Information............................................................................................................................................................ 209

Appendix A: Revision History............................................................................................................................................................ 219

Appendix B: Device Differences........................................................................................................................................................ 219

Appendix C:Conversion Considerations........................................................................................................................................... 220

Index ................................................................................................................................................................................................. 221

On-Line Support................................................................................................................................................................................ 229

Systems Information and Upgrade Hot Line..................................................................................................................................... 229

Reader Response............................................................................................................................................................................. 230

PIC16F87XA Product Identification System...................................................................................................................................... 231

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PIC16F87XA

1.0 DEVICE OVERVIEW

This document contains device specific information

about the following devices:

• PIC16F873A

• PIC16F874A

• PIC16F876A

• PIC16F877A

PIC16F873A/876A devices are available only in 28-pin

packages, while PIC16F874A/877A devices are avail-

able in 40-pin and 44-pin packages. All devices in the

PIC16F87XA family share common architecture with

the following differences:

• The PIC16F873A andPIC16F874A have one-half

of the total on-chip memory of the PIC16F876A

and PIC16F877A

• The 28-pin devices have three I/O ports, while the

40/44-pin devices have five

• The 28-pin devices have fourteen interrupts, while

the 40/44-pin devices have fifteen

• The 28-pin devices have five A/D input channels,

while the 40/44-pin devices have eight

• The Parallel Slave Port is implemented only on

the 40/44-pin devices

The available features are summarized in Table 1-1.

Block diagrams of the PIC16F873A/876A and

PIC16F874A/877A devices are provided in Figure 1-1

and Figure 1-2, respectively. The pinouts for these

device families are listed in Table 1-2 and Table 1-3.

Additional information may be found in the PICmicro®

Mid-Range Reference Manual (DS33023), which may

be obtained from your local Microchip Sales Represen-

tative or downloaded from the Microchip web site. The

Reference Manual should be considered a complemen-

tary document to this data sheet and is highly recom-

mended reading for a better understanding of the device

architecture and operation of the peripheral modules.

TABLE 1-1: PIC16F87XA DEVICE FEATURES

Key Features PIC16F873A PIC16F874A PIC16F876A PIC16F877A

Operating Frequency DC – 20 MHz DC – 20 MHz DC – 20 MHz DC – 20 MHz

Resets (and Delays) POR, BOR

(PWRT, OST) POR, BOR

(PWRT, OST)

Flash Program Memory

(14-bit words) 4K 4K 8K 8K

Data Memory (bytes) 192 192 368 368

EEPROM Data Memory (bytes) 128 128 256 256

Interrupts 14 15 14 15

I/O Ports Ports A, B, C Ports A, B, C, D, E Ports A, B, C Ports A, B, C, D, E

Timers 3333

Capture/Compare/PWMmodules2222

Serial Communications MSSP, USART MSSP, USART MSSP, USART MSSP, USART

Parallel Communications — PSP — PSP

10-bit Analog-to-Digital Module 5 input channels 8 input channels 5 input channels 8 input channels

AnalogComparators 2222

Instruction Set 35 Instructions 35 Instructions 35 Instructions 35 Instructions

Packages 28-pin PDIP

28-pin SOIC

28-pin SSOP

28-pin QFN

40-pin PDIP

44-pin PLCC

44-pin TQFP

44-pin QFN

28-pin PDIP

28-pin SOIC

28-pin SSOP

28-pin QFN

40-pin PDIP

44-pin PLCC

44-pin TQFP

44-pin QFN

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FIGURE 1-1: PIC16F873A/876A BLOCK DIAGRAM

Flash

13 Data Bus 8

Program

Bus

Instruction reg

Program Counter

8 Level Stack

(13-bit)

RAM

File

Registers

Direct Addr 7

RAM Addr(1) 9

Addr MUX

Indirect

Addr

FSR reg

Status reg

MUX

ALU

W reg

Power-up

Timer

Oscillator

Start-up Timer

Power-on

Reset

Watchdog

Timer

Instruction

Decode &

Control

Timing

Generation

OSC1/CLKI

OSC2/CLKO

MCLR VDD, VSS

PORTA

PORTB

PORTC

RA4/T0CKI/C1OUT

RA5/AN4/SS/C2OUT

RB0/INT

RC0/T1OSO/T1CKI

RC1/T1OSI/CCP2

RC2/CCP1

RC3/SCK/SCL

RC4/SDI/SDA

RC5/SDO

RC6/TX/CK

RC7/RX/DT

Brown-out

Reset

Note 1: Higher order bits are from the Status register.

USART

CCP1,2 Synchronous

10-bit A/D

Timer0 Timer1 Timer2

Serial Port

RA3/AN3/VREF+

RA2/AN2/VREF-/CVREF

RA1/AN1

RA0/AN0

Data EEPROM

RB1

RB2

RB3/PGM

RB4

RB5

RB6/PGC

RB7/PGD

In-Circuit

Debugger

Low-Voltage

Programming

Comparator Voltage

Reference

Device Program Flash Data Memory Data EEPROM

PIC16F873A 4K words 192 Bytes 128 Bytes

PIC16F876A 8K words 368 Bytes 256 Bytes

Program

Memory

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PIC16F87XA

FIGURE 1-2: PIC16F874A/877A BLOCK DIAGRAM

13 Data Bus 8

Program

Bus

Instruction reg

Program Counter

8 Level Stack

(13-bit)

RAM

File

Registers

Direct Addr 7

RAM Addr(1) 9

Addr MUX

Indirect

Addr

FSR reg

Status reg

MUX

ALU

W reg

Power-up

Timer

Oscillator

Start-up Timer

Power-on

Reset

Watchdog

Timer

Instruction

Decode &

Control

Timing

Generation

OSC1/CLKI

OSC2/CLKO

MCLR VDD, VSS

PORTA

PORTB

PORTC

PORTD

PORTE

RA4/T0CKI/C1OUT

RA5/AN4/SS/C2OUT

RC0/T1OSO/T1CKI

RC1/T1OSI/CCP2

RC2/CCP1

RC3/SCK/SCL

RC4/SDI/SDA

RC5/SDO

RC6/TX/CK

RC7/RX/DT

RE0/RD/AN5

RE1/WR/AN6

RE2/CS/AN7

Brown-out

Reset

Note 1: Higher order bits are from the Status register.

RA3/AN3/VREF+

RA2/AN2/VREF-/CVREF

RA1/AN1

RA0/AN0

Parallel

RB0/INT

RB1

RB2

RB3/PGM

RB4

RB5

RB6/PGC

RB7/PGD

In-Circuit

Debugger

Low-Voltage

Programming

RD0/PSP0

RD1/PSP1

RD2/PSP2

RD3/PSP3

RD4/PSP4

RD5/PSP5

RD6/PSP6

RD7/PSP7

USART

CCP1,2 Synchronous

10-bit A/D

Timer0 Timer1 Timer2

Serial Port

Data EEPROM Comparator Voltage

Reference

Device Program Flash Data Memory Data EEPROM

PIC16F874A 4K words 192 Bytes 128 Bytes

PIC16F877A 8K words 368 Bytes 256 Bytes

Flash

Program

Memory

Slave Port

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TABLE 1-2: PIC16F873A/876A PINOUT DESCRIPTION

Pin Name PDIP,SOIC,

SSOP Pin# QFN

Pin# I/O/P

Type Buffer

Type Description

OSC1/CLKI

OSC1

CLKI

96I

ST/CMOS(3) Oscillator crystal or external clock input.

Oscillator crystal input or external clock source input. ST

buffer when configured in RC mode; otherwise CMOS.

External clock source input. Always associated with pin

function OSC1 (see OSC1/CLKI, OSC2/CLKO pins).

OSC2/CLKO

OSC2

CLKO

10 7 O

— Oscillator crystal or clock output.

Oscillator crystal output. Connects to crystal or resonator

in Crystal Oscillator mode.

In RC mode, OSC2 pin outputs CLKO, which has 1/4 the

frequency of OSC1 and denotes the instruction cycle rate.

MCLR/VPP

MCLR

VPP

126

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

Master Clear (Reset) input. This pin is an active low Reset

to the device.

Programming voltage input.

PORTA is a bidirectional I/O port.

RA0/AN0

RA0

AN0

227

I/O

TTL Digital I/O.

Analog input 0.

RA1/AN1

RA1

AN1

328

I/O

TTL Digital I/O.

Analog input 1.

RA2/AN2/VREF-/

CVREF

RA2

AN2

VREF-

CVREF

I/O

TTL Digital I/O.

Analog input 2.

A/D reference voltage (Low) input.

Comparator VREF output.

RA3/AN3/VREF+

RA3

AN3

VREF+

I/O

TTL Digital I/O.

Analog input 3.

A/D reference voltage (High) input.

RA4/T0CKI/C1OUT

RA4

T0CKI

C1OUT

I/O

ST Digital I/O – Open-drain when configured as output.

Timer0 external clock input.

Comparator 1 output.

RA5/AN4/SS/C2OUT

RA5

AN4

C2OUT

I/O

TTL Digital I/O.

Analog input 4.

SPI slave select input.

Comparator 2 output.

Legend: I = input O = output I/O = input/output P = power

— = Not used TTL = TTL input ST = Schmitt Trigger input

Note 1: This buffer is a Schmitt Trigger input when configured as the external interrupt.

2: This buffer is a Schmitt Trigger input when used in Serial Programming mode.

3: This buffer is a Schmitt Trigger input when configured in RC Oscillator mode and a CMOS input otherwise.

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