hi,all

now,watchdog chip can buy anywhere,and it it is very effictive in our system.

but,in some application,the cost is very
key question,we must cut down the cost.
some time,i use software as watchdog.
for example:
...
org 000bh
ajmp timedog

org 0100h
main:...
...
reload time0,don't overflow the time0
orl pcon,#01h
ajmp main
=================
timedog:
....
reti

But some time,(if interferential pulse
is high).my system is dead!

anyone have a good solution(not use hardware),I am very interesting.


John cason