SMBP2501BPB datasheet(75/107 Pages) SONIX

75 / 107 page

SN8P2501B

8-Bit Micro-Controller

SONiX TECHNOLOGY CO., LTD

Page 75

Version 2.1

Watchdog timer application note is as following.



Before clearing watchdog timer, check I/O status and check RAM contents can improve system error.



Don’t clear watchdog timer in interrupt vector and interrupt service routine. That can improve main routine fail.



Clearing watchdog timer program is only at one part of the program. This way is the best structure to enhance the

watchdog timer function.



Example: An operation of watchdog timer is as following. To clear the watchdog timer counter in the top

of the main routine of the program.

Main:

…

; Check I/O.

…

; Check RAM

Err:

JMP $

; I/O or RAM error.

Program jump here and don’t

; clear watchdog. Wait watchdog timer overflow to reset IC.

Correct:

; I/O and RAM are correct. Clear watchdog timer and

; execute program.

MOV

A,#5AH

; Only one clearing watchdog timer of whole program.

B0MOV

WDTR,A

…

CALL

SUB1

CALL

SUB2

…

JMP

MAIN

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