American Megatrends PMB-901LF User Manual page 131

Appendix B Technical Summary
Example Steps
Enable watchdog timer and set timeout interval to 30 seconds.
;------ Enter to extended function mode ---------------------------------------------------
mov dx, 2eh
mov al, 87h
out dx, al
out dx, al
;------ Select Logical Device 8 of watchdog timer ---------------------------------------
mov al, 07h
out dx, al
inc dx
mov al, 08h
out dx, al
;------ Set second as counting unit ---------------------------------------------------------
dec dx
mov al, 0f5h
out dx, al
inc dx
in al, dx
and al, not 08h
out dx, al
;------ Set timeout interval as 30seconds and start counting -------------------------
dec dx
mov al, 0f6h
out dx, al
inc dx
mov al, 30
out dx, al
;------ Exit the extended function mode ---------------------------------------------------
dec dx
mov al, 0aah
out dx, al
Page: B-16
PMB-901LF USER
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