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PIC12F635

8/14-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

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PIC12F635/PIC16F636/639

WDA (Weak Pull-up/Pull-down PORTA)..................... 40

WDTCON (Watchdog Timer Control)........................ 126

WPUDA (Weak Pull-up/Pull-down Direction PORTA). 40

Reset................................................................................. 113

Revision History ................................................................ 187

S

Software Simulator (MPLAB SIM)..................................... 142

Software Simulator (MPLAB SIM30)................................. 142

Special Function Registers (SFR)....................................... 12

Maps

PIC12F635.......................................................... 13

PIC16F636/639................................................... 14

Summary

PIC12F635, Bank 0............................................. 15

PIC12F635, Bank 1............................................. 16

PIC12F635/PIC16F636/639, Bank 2 .................. 19

PIC16F636/639, Bank 0...................................... 17

PIC16F636/639, Bank 1...................................... 18

SPI Timing

Analog Front-End (AFE) for PIC16F639 ................... 171

Status Register

IRP Bit ......................................................................... 20

RP Bits ........................................................................ 20

T

Time-out Sequence........................................................... 116

Timer0 ................................................................................. 53

Associated Registers .................................................. 55

Interrupt....................................................................... 53

Operation .................................................................... 53

T0CKI .......................................................................... 54

Using with External Clock ........................................... 54

Timer0 and Timer1

External Clock Requirements ................................... 166

Timer1 ................................................................................. 57

Associated Registers .................................................. 60

Asynchronous Counter Mode ..................................... 60

Reading and Writing ........................................... 60

Interrupt....................................................................... 58

Modes of Operations................................................... 58

Operation During Sleep .............................................. 60

Oscillator ..................................................................... 60

Prescaler ..................................................................... 58

Timer1 Gate

Inverting Gate ..................................................... 58

Selecting Source........................................... 58, 67

Synchronizing C2OUT w/ Timer1 ....................... 67

TMR1H Register ......................................................... 57

TMR1L Register .......................................................... 57

Timing Diagrams

Brown-out Detect (BOD) ........................................... 165

Brown-out Detect Situations ..................................... 115

CLKOUT and I/O....................................................... 163

External Clock ........................................................... 162

Fail-Safe Clock Monitor (FSCM) ................................. 37

INT Pin Interrupt........................................................ 123

Reset, Watchdog Timer, Oscillator Start-up Timer and

Power-up Timer ................................................ 164

Single Comparator ...................................................... 62

Time-out Sequence on Power-up (Delayed MCLR) . 118

Time-out Sequence on Power-up (MCLR with VDD). 118

Timer0 and Timer1 External Clock ........................... 166

Timer1 Incrementing Edge.......................................... 58

Two-Speed Start-up .................................................... 36

Wake-up from Sleep through Interrupt...................... 128

Timing Parameter Symbology .......................................... 161

TRISA ................................................................................. 39

Two-Speed Clock Start-up Mode........................................ 35

U

Ultra Low-Power Wake-up.................................. 9, 10, 39, 43

V

Voltage Reference. See Comparator Voltage Reference

(CVREF).

W

Wake-up from Sleep ......................................................... 127

Wake-up Reset (WUR) ..................................................... 114

Wake-up using Interrupts.................................................. 127

Watchdog Timer (WDT).................................................... 125

Associated Registers ................................................ 126

Control ...................................................................... 125

Oscillator................................................................... 125

Specifications ........................................................... 165

WWW Address ................................................................. 185

WWW, On-Line Support ....................................................... 3

DS41232B-page 192

Preliminary

© 2005 Microchip Technology Inc.

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