Pro-Tech BE-0986 - Page 117

Appendix A Technical Summary
BE-0986 SERIES USER MANUAL
Page: A-25
Code example for watch dog timer
Enable the watchdog timer and set the 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 7 of watchdog timer ---------------------
mov al, 07h
out dx, al
inc dx
mov al, 07h
out dx, al
;---------------------------------Enable Watch dog feature ------------------------------
dec dx
mov al, 30h
out dx, al
inc dx
mov al, 01h
out dx, al
; ---------------- Set timeout interval as 30seconds and start counting --------------
dec dx
mov al, F6h
out dx, al
inc dx
mov al, 1Eh
out dx, al
;------------------------------- Enable Watch PME--------------------------------------------
dec dx
mov al, FAh
out dx, al
inc dx
in al, dx
or al, 51h
out dx, al
;-------------------------- Set second as counting unit --------------------------------------
dec dx
mov al, F5h
out dx, al
inc dx
in al, dx
and al, DEh
out dx, al
;-------------------------- Start the watchdog timer --------------------------------------
or al, 20h
out dx, al
;---------------------------------Exit the extended function mode -------------------------
dec dx
mov al, AAh
out dx, al