AXIOMTEK tBOX320-852-FL Series, User Manual

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tBOX320-852-FL Series U
ser’s Manual
Watchdog Timer
83
APPENDIX A
WATCHDOG TIMER
What is Watchdog Timer
The integrated W atchdog Timer can be set up by programming.
There are 1~255 levels available. As long as the vaule of timer is
set, after enabling, the countdown of the value is starting. It
needs to reset or disable watchdog, otherwise auto-reset will be
running when the value is counted to 0.
How to Use the Watchdog Timer
A
ssembler
Sample Code
;Enable WDT:
mov dx,2Eh
mov al,87h ;Un-lock super I/O
out dx,al
out dx,al
;Select Logic device:
mov dx,2Eh
mov al,07h
out dx,al
mov dx,2Fh
mov al,08h
out dx,al
;Select W DT Function:
mov dx,2Eh
mov al,2Dh
out dx,al
mov dx,2Fh
mov al,20h
out dx,al