Protech Systems PMB-881LF User Manual page 115

Appendix B Technical Summary
Example Program
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 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-10
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