Protech Systems BU-2509 User Manual page 130

Example Program
Enable watchdog timer and set the time-out interval to 30 seconds.
; ------------------------- Enter to extended function mode ----------------------------
--- mov dx, 2eh
mov al, 87h
out dx, al
out dx, al
; ----------------------- Select Logical Device 7 of watchdog timer ------------------
--- mov al, 07h
out dx, al
inc dx
mov al, 07h
out dx, al
;---------------------------------Enable Watch dog feature ------------------------------
mov al, 030h
out dx, al
inc dx
mov al, 01h
out dx, al
;------------------------------- Enable Watch PME--------------------------------------------
dec dx
mov al, 0FAh
out dx, al
inc dx
in al, dx
and al, 51h
out dx, al
;-------------------------- Set second as counting unit --------------------------------------
dec dx
mov al, 0f5h
out dx, al
inc dx
in al, dx
and al, 30h
out dx, al
; ---------------- Set timeout interval as 30seconds and start counting -----------
--- dec dx
mov al, 0f6h
out dx, al
inc dx
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BU-2509 USER S MANUAL
Appendix A Technical Summary
Page: A-14