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PIC16F627A/628A/648A

Data Sheet

Flash-Based, 8-Bit CMOS

Microcontrollers with nanoWatt Technology

Information contained in this publication regarding device

applications and the like is provided only for your convenience

and may be superseded by updates.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

ensure that your application meets with your specifications.

MICROCHIP MAKES NO REPRESENTATIONS OR

WARRANTIES OF ANY KIND WHETHER EXPRESS OR

IMPLIED, WRITTEN OR ORAL, STATUTORY OR

OTHERWISE, RELATED TO THE INFORMATION,

INCLUDING BUT NOT LIMITED TO ITS CONDITION,

QUALITY, PERFORMANCE, MERCHANTABILITY OR

FITNESS FOR PURPOSE. Microchip disclaims all liability

arising from this information and its use. Use of Microchip

devices in life support and/or safety applications is entirely at

the buyer’s risk, and the buyer agrees to defend, indemnify and

hold harmless Microchip from any and all damages, claims,

suits, or expenses resulting from such use. No licenses are

conveyed, implicitly or otherwise, under any Microchip

intellectual property rights.

Trademarks

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

EELOQ, KEELOQ logo, MPLAB, PIC, PICmicro, PICSTART,

rfPIC and UNI/O are registered trademarks of Microchip

Technology Incorporated in the U.S.A. and other countries.

FilterLab, Hampshire, HI-TECH C, Linear Active Thermistor,

MXDEV, MXLAB, SEEVAL and The Embedded Control

Solutions Company are registered trademarks of Microchip

Technology Incorporated in the U.S.A.

Analog-for-the-Digital Age, Application Maestro, CodeGuard,

dsPICDEM, dsPICDEM.net, dsPICworks, dsSPEAK, ECAN,

ECONOMONITOR, FanSense, HI-TIDE, In-Circuit Serial

Programming, ICSP, Mindi, MiWi, MPASM, MPLAB Certified

logo, MPLIB, MPLINK, mTouch, Octopus, Omniscient Code

Generation, PICC, PICC-18, PICDEM, PICDEM.net, PICkit,

PICtail, PIC

logo, REAL ICE, rfLAB, Select Mode, Total

Endurance, TSHARC, UniWinDriver, WiperLock and ZENA

are trademarks of Microchip Technology Incorporated in the

U.S.A. and other countries.

SQTP is a service mark of Microchip Technology Incorporated

in the U.S.A.

All other trademarks mentioned herein are property of their

respective companies.

Printed on recycled paper.

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

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

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

intended manner and under normal conditions.

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

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

Sheets. Most likely, the person doing so is engaged in theft of intellectual property.

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

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

mean that we are guaranteeing the product as “unbreakable.”

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

products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts

allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.

Microchip received ISO/TS-16949:2002 certification for its worldwide

headquarters, design and wafer fabrication facilities in Chandler and

Tempe, Arizona; Gresham, Oregon and design centers in California

and India. The Company’s quality system processes and procedures

are for its PIC

MCUs and dsPIC

DSCs, KEELOQ

code hopping

devices, Serial EEPROMs, microperipherals, nonvolatile memory and

analog products. In addition, Microchip’s quality system for the design

and manufacture of development systems is ISO 9001:2000 certified.

PIC16F627A/628A/648A

High-Performance RISC CPU:

• Operating speeds from DC – 20 MHz

• Interrupt capability

• 8-level deep hardware stack

• Direct, Indirect and Relative Addressing modes

• 35 single-word instructions:

- All instructions single cycle except branches

Special Microcontroller Features:

• Internal and external oscillator options:

- Precision internal 4 MHz oscillator factory

calibrated to ±1%

- Low-power internal 48 kHz oscillator

- External Oscillator support for crystals and

resonators

• Power-saving Sleep mode

• Programmable weak pull-ups on PORTB

• Multiplexed Master Clear/Input-pin

• Watchdog Timer with independent oscillator for

reliable operation

• Low-voltage programming

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

• Programmable code protection

• Brown-out Reset

• Power-on Reset

• Power-up Timer and Oscillator Start-up Timer

• Wide operating voltage range (2.0-5.5V)

• Industrial and extended temperature range

• High-Endurance Flash/EEPROM cell:

- 100,000 write Flash endurance

- 1,000,000 write EEPROM endurance

- 40 year data retention

Low-Power Features:

• Standby Current:

- 100 nA @ 2.0V, typical

• Operating Current:

-12μA @ 32 kHz, 2.0V, typical

-120μA @ 1 MHz, 2.0V, typical

• Watchdog Timer Current:

-1μA @ 2.0V, typical

• Timer1 Oscillator Current:

-1.2μA @ 32 kHz, 2.0V, typical

• Dual-speed Internal Oscillator:

- Run-time selectable between 4 MHz and

48 kHz

-4μs wake-up from Sleep, 3.0V, typical

Peripheral Features:

• 16 I/O pins with individual direction control

• High current sink/source for direct LED drive

• Analog comparator module with:

- Two analog comparators

- Programmable on-chip voltage reference

REF) module

- Selectable internal or external reference

- Comparator outputs are externally accessible

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

programmable prescaler

• Timer1: 16-bit timer/counter with external crystal/

clock capability

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

• Capture, Compare, PWM module:

- 16-bit Capture/Compare

-10-bit PWM

• Addressable Universal Synchronous/Asynchronous

Receiver/Transmitter USART/SCI

Device

Program

Memory

Data Memory

I/O

CCP

(PWM)

USART Comparators

Timers

8/16-bit

Flash

(words)

SRAM

(bytes)

EEPROM

(bytes)

PIC16F627A 1024 224 128 16 1 Y 2 2/1

PIC16F628A 2048 224 128 16 1 Y 2 2/1

PIC16F648A 4096 256 256 16 1 Y 2 2/1

18-pin Flash-Based, 8-Bit CMOS Microcontrollers

with nanoWatt Technology

PIC16F627A/628A/648A

Pin Diagrams

PDIP, SOIC

SSOP

27A/628A/648A

RA6/OSC2/CLKOUT

RA7/OSC1/CLKIN

VSS

VDD

RA1/AN1

RA0/AN0

RB6/T1OSO/T1CKI/PGC

RB7/T1OSI/PGD

RB1/RX/DT

RB2/TX/CK

RB3/CCP1

RB4/PGM

RB5

RA3/AN3/CMP1

RA4/T0CKI/CMP2

RA5/MCLR

/VPP

RB0/INT

RA2/AN2/V

REF

VSS

RB1/RX/DT

RB2/TX/CK

RB3/CCP1

RA3/AN3/CMP1

RA4/T0CKI/CMP2

RA5/MCLR

/VPP

RB0/INT

RA2/AN2/V

REF

RA6/OSC2/CLKOUT

RA7/OSC1/CLKIN

RA1/AN1

RA0/AN0

RB6/T1OSO/T1CKI/PGC

RB7/T1OSI/PGD

RB4/PGM

RB5

PIC16F627A/628A/648A

RA2/AN2/VREF

RA3/AN3/CMP1

RA4/T0CKI/CMP2

RA5/MCLR/VPP

VSS

RB0/INT

RB1/RX/DT

RB2/TX/CK

RB3/CCP1

RA1/AN1

RA0/AN0

RA7/OSC1/CLKIN

RA6/OSC2/CLKOUT

RB7/T1OSI/PGD

RB6/T1OSO/T1CKI/PGC

RB5

VDD

RB4/PGM

VSS

PIC16F627A/628A

PIC16F648A

28-Pin

QFN

118

PIC16F627A/628A/648A

Table of Contents

1.0 General Description ........................................................................................................................................................................ 7

2.0 PIC16F627A/628A/648A Device Varieties...................................................................................................................................... 9

3.0 Architectural Overview .................................................................................................................................................................. 11

4.0 Memory Organization .................................................................................................................................................................... 17

5.0 I/O Ports........................................................................................................................................................................................ 33

6.0 Timer0 Module .............................................................................................................................................................................. 47

7.0 Timer1 Module .............................................................................................................................................................................. 50

8.0 Timer2 Module .............................................................................................................................................................................. 54

9.0 Capture/Compare/PWM (CCP) Module........................................................................................................................................ 57

10.0 Comparator Module .................................................................................................................................................................... 63

11.0 Voltage Reference Module ......................................................................................................................................................... 69

12.0 Universal Synchronous Asynchronous Receiver Transmitter (USART) Module......................................................................... 73

13.0 Data EEPROM Memory .............................................................................................................................................................. 91

14.0 Special Features of the CPU ...................................................................................................................................................... 97

15.0 Instruction Set Summary........................................................................................................................................................... 117

16.0 Development Support ............................................................................................................................................................... 131

17.0 Electrical Specifications ............................................................................................................................................................ 135

18.0 DC and AC Characteristics Graphs and Tables ....................................................................................................................... 151

19.0 Packaging Information .............................................................................................................................................................. 163

Appendix A: Data Sheet Revision History......................................................................................................................................... 171

Appendix B: Device Differences ....................................................................................................................................................... 171

Appendix C: Device Migrations......................................................................................................................................................... 172

Appendix D: Migrating from other PIC

Devices .............................................................................................................................. 172

The Microchip Web Site .................................................................................................................................................................... 173

Customer Change Notification Service ............................................................................................................................................. 173

Customer Support ............................................................................................................................................................................. 173

Reader Response ............................................................................................................................................................................. 174

Product Identification System ........................................................................................................................................................... 179

TO OUR VALUED CUSTOMERS

It is our intention to provide our valued customers with the best documentation possible to ensure successful use of your Micro-

chip 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).