PIC16F627-04I/P 데이터 시트보기 (PDF) - Microchip Technology

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PIC16F627-04I/P

FLASH-Based 8-Bit CMOS Microcontroller

Microchip Technology 

PIC16F62X

6.3 Timer0 Prescaler

An 8-bit counter is available as a prescaler for the

Timer0 module, or as a postscaler for the Watchdog

Timer. A prescaler assignment for the Timer0 module

means that there is no postscaler for the Watchdog

Timer, and vice-versa.

The PSA and PS2:PS0 bits (OPTION<3:0>) determine

the prescaler assignment and prescale ratio.

When assigned to the Timer0 module, all instructions

writing to the TMR0 register (e.g., CLRF 1,

MOVWF 1, BSF 1, x....etc.) will clear the pres-

caler. When assigned to WDT, a CLRWDT instruction

will clear the prescaler along with the Watchdog Timer.

The prescaler is not readable or writable.

FIGURE 6-1:

FOSC/4

BLOCK DIAGRAM OF THE TIMER0/WDT

Data Bus

T0CKI

Pin

T0SE

0

1

T0CS

1

0

PSA

SYNC

2

Cycles

8

TMR0 reg

Set Flag Bit T0IF

on Overflow

Watchdog

Timer

0

1

PSA

WDT Postscaler/

TMR0 Prescaler

8

8-to-1MUX

PS0 - PS2

WDT Enable bit

0

1

PSA

WDT

Timeout

Note 1: T0SE, T0CS, PSA, .PS0-PS2 are bits in the Option Register.

DS40300C-page 44

Preliminary

 2003 Microchip Technology Inc.

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