PIC16C926-PT 查看數據表（PDF） - Microchip Technology

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PIC16C926-PT

64/68-Pin CMOS Microcontrollers with LCD Driver

Microchip Technology 

PIC16C925/926

5.3 Prescaler

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

Timer0 module, or as a postscaler for the Watchdog

Timer (Figure 5-6). For simplicity, this counter is being

referred to as “prescaler” throughout this data sheet.

Note that the prescaler may be used by either the

Timer0 module or the WDT, but not both. Thus, a pres-

caler assignment for the Timer0 module means that

there is no prescaler 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 prescaler count. When

assigned to WDT, a CLRWDT instruction will clear the

prescaler count along with the Watchdog Timer. The

prescaler is not readable or writable.

Note:

Writing to TMR0 when the prescaler is

assigned to Timer0, will clear the prescaler

count, but will not change the prescaler

assignment.

FIGURE 5-6:

BLOCK DIAGRAM OF THE TIMER0/WDT PRESCALER

CLKOUT (= FOSC/4)

RA4/T0CKI

pin

T0SE

0M

U

X

1

T0CS

1

M

0

U

X

PSA

SYNC

2

Cycles

Data Bus

8

TMR0 reg

Set Flag bit TMR0IF

on Overflow

Watchdog

Timer

WDT Enable bit

0

M

U

1X

PSA

8-bit Prescaler

8

8 - to - 1 MUX

0

1

MUX

WDT

Time-out

Note: T0CS, T0SE, PSA, PS2:PS0 are (OPTION<5:0>).

PS2:PS0

PSA

DS39544A-page 44

Preliminary

 2001 Microchip Technology Inc.

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