W78E052C 查看數據表（PDF） - Winbond

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W78E052C

8-BIT MICROCONTROLLER

Winbond 

W78E52C/W78E052C

PS2, PS1, PS0: Watch-dog prescaler timer select. Prescaler is selected when set PS2~0 as follows:

PS2 PS1 PS0

00 0

00 1

01 0

01 1

10 0

10 1

11 0

11 1

PRESCALER SELECT

2

4

8

16

32

64

128

256

The time-out period is obtained using the following equation:

1 × 214 × PRESCALER × 1000 × 12 mS

OSC

Before Watchdog time-out occurs, the program must clear the 14-bit timer by writing 1 to WDTC.6

(CLRW). After 1 is written to this bit, the 14-bit timer, prescaler and this bit will be reset on the next

instruction cycle. The Watchdog timer is cleared on reset.

W IDL

IDLE

OSC

1/12

ENW

EXTERNAL

RESET

PRESCALER

14-BIT TIMER

CLEAR

Watchdog Timer Block Diagram

CLRW

INTERNAL

RESET

-8-

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