protech SP-7145, User Manual

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Appendix B Technical Summary
SP-7145/7147 SERIES USER MANUAL Page: B-14
Code example for watchdog timer
Enable watchdog timer and set 30 sec. as timeout interval
;------ 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