UPD78323LP datasheet(40/86 Pages) NEC

tên linh kiện	UPD78323LP

Giải thích chi tiết về linh kiện	16/8-BIT SINGLE-CHIP MICROCONTROLLER

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µPD78323, 78324

3.10 WATCHDOG TIMER

The watchdog timer is used to prevent program overrun and deadlock. Normal operation of the program or system can

be confirmed by checking that no watchdog timer interrupt has been generated. Thus, an instruction to clear the watchdog

timer (timer start) is set into each program module.

If the watchdog timer clear instruction is not cleared within the time period set into the watchdog timer and the watchdog

timer overflows, a watchdog timer interrupt is generated, and a low level is generated to WDTO pin, thereby notifying of

an error in the program.

The watchdog timer can also be used to maintain the oscillation stabilizing time of the oscillator after the stop mode has

been released.

Figure 3-8 shows the watchdog timer configuration.

Figure 3-8. Watchdog Timer Configuration

fCLK/28

fCLK/210

fCLK/212

Watchdog Timer (8 Bits)

Clear

Timer (5 Bits)

Oscillation Stabilizing

Time Controller

INTWDT

WDTO

WDT CLR

WDT STOP

Overflow

UPD78323LP bảng dữ liệu(PDF) 40 Page - NEC