Appendix A How To Use Watch-Dog Timer - Lanner electronics TEM-370B Series Manual

APPENDIX A.
You can enable the watch-dog when your application software monitors an unexpected or
not responding, so then the timer generates a reset to reboot your system. During the
period of enable to reset, you could still cancel reset by disabling the watch-dog. Decide
the way you want to set the period for reset by selecting hardware or software watch-dog
(if both of them are available). For hardware setting period, select period by adjusting
jumper. For software setting period, normally hardware watch-dog timer is set to 16 sec.
period.
Software watch-dog using example
EX.1: For DOS
Enable
C:\DOS> DEBUG
-o443F
EX.2: For assemble Language
Enable
MOV DX, 443H
MOV AL, 0FH
OUT DX, AL
Note : "F" is the period setting of software watch-dog timer (normally "F" indicated 0 sec.).
0 to 9 and A to F are used for represent different period. Normally, the step is 2 sec. That
means "E" is 2, "D" is 4, "2" is 26, "1" is 28 and "0" is 30 seconds.
HOW TO USE WATCH-DOG TIMER
:
Disable
C:\DOS>DEBUG
-o441F
Disable :
MOV DX, 441H
MOV AL, 0FH
OUT DX, AL
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