National Instruments TPC-2012 Example 3: Enable the Mouse to Reset the Watchdog Timer

Appendix C Watchdog Timer Programming
TPC-2012 User Manual C-6 ni.com
Example 3: Enable the Mouse to Reset the Watchdog Timer
;-----------------------------------------------------------
Mov dx,2eh ; unlock W83627H
Mov al,87h
Out dx,al
Out dx,al
;-----------------------------------------------------------
Mov al,07h ; Select registers of watchdog timer
Out dx,al
Inc dx
Mov al,08h
Out dx,al
;-----------------------------------------------------------
Dec dx ; Enable the function of watchdog timer
Mov al,30h
Out dx,al
Inc dx
Mov al,01h
Out dx,al
;-----------------------------------------------------------
Dec dx ; Enable watchdog timer to be reset by mouse
Mov al,0f7h
Out dx,al
Inc dx
In al,dx
Or al,80h
Out dx,al
;-----------------------------------------------------------
Dec dx ; lock W83627HF
Mov al,0aah
Out dx,al