AXIOMTEK eBOX621-801-FL Series, Руководство пользователя

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eBOX621-801-FL Series U
ser’s Manual
Watchdog Timer
79
APPENDIX A
WATCHDOG TIMER
 What is Watchdog Timer
After the system stops working for a while, it can be auto -reset by the W atchdog Timer.
The integrated W atchdog Timer can be set up in the system reset mode by program.
The integrated W atchdog Timer can be set up by programming. There are 1~255 levels
available. As long as the value 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
 Timeout Value Range

1 to 255

Minute / Second
 Timeout Value Range
 Assembler 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
;Activate WDT:
mov dx,2Eh
Mov al,30h
out dx,al
mov dx,2Fh