~ 47 ~
HOW TO USE WATCH-DOG TIMER
If you enable the watch-dog, the hardware timer will reboot your system if your software
encounters an unexpected error, or stops responding. The watch-dog timer period
(from enable to reset) was decided by the jumper setting of watch-dog time out period.
Please refer to the chapter on jumper settings and connectors. During the period of
enable to reset, you could still cancel reset by disabling the watch-dog.
EX.1: For DOS
Execute the
DEBUG.EXE
file under DOS, Then key-in
i443
. The system will reboot
automatically according to the time-out you set.
For example, if you want to Set
4 seconds
for the time-out, you should set
JP5 (4-8)
Enable
C:\DOS> DEBUG
-i443
Disable
C:\DOS>DEBUG
-i43
EX.2: For assembly Language
Enable :
:
:
MOV DX, 443H
IN AL, DX
:
:
Disable :
:
:
IN AL, 43H
:
:
APPENDIX A
