Appendixa. Watch-Dog Timer - Lanner electronics EM-9560 Series User Manual

Appendix A How to use watch-dog timer

APPENDIXA. Watch-Dog Timer

To use the watch-dog timer:
Step 1. Enable and re-trigger the Watchdog timer: Output port 443H
Step 2. Disable
EX.1: For DOS
EX.2: For assemble Language
48
Execute the DEBUG.EXE file under DOS, Then key-in O443. The system will reboot
automatically according to the time-out you set.
Enable
C:\DOS> DEBUG
O 443 0~F
Enable:
:
:
MOV DX, 443H
OUT DX, AL
:
:
Disable:
:
:
MOV DX, 441H
OUT DX, AL
:
: Output port 441H
Disable
C:\DOS> DEBUG
O 441 0~F
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