National-instruments Touch Panel Computer TPC-2012 Manuel d'utilisateur télécharger pdf (Page 33)

Appendix C Watchdog Timer Programming

Example 4: Enable the Keyboard to Reset the Watchdog Timer

;-----------------------------------------------------------

Mov dx,2eh ; unlock W83627H

Mov al,87h

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 strobed reset by keyboard

Mov al,0f7h

Out dx,al

Inc dx

In al,dx

Or al,40h

Out dx,al

;-----------------------------------------------------------

Dec dx ; lock W83627HF

Mov al,0aah

Out dx,al

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National-instruments Touch Panel Computer TPC-2012 Manuel d'utilisateur Page 33