PIC16LF627A-I/ML 데이터 시트보기 (PDF) - Microchip Technology

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PIC16LF627A-I/ML

Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

Microchip Technology 

PIC16F627A/628A/648A

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 PS<2:0> 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 prescaler. 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

0

1

T0SE

T0CS

TMR1 Clock Source

1

0

PSA

SYNC

2

Cycles

8

TMR0 Reg

Set flag bit T0IF

on Overflow

Watchdog

Timer

WDT Enable bit

0

1

PSA

WDT Postscaler/

TMR0 Prescaler

8

8-to-1MUX

PS<2:0>

1

WDT

0

Time-out

PSA

Note: T0SE, T0CS, PSA., PS<2:0> are bits in the Option Register.

DS40044F-page 46

© 2007 Microchip Technology Inc.

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