Advantech AIMB-270 Manual do Utilizador descarregar pdf (Página 85)

73 AIMB-270 User Manual

Appendix A Programming the Watchdog Timer

A.1.3 Example Program

1. Enable watchdog timer and set 10 sec. as timeout interval

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

Mov dx,2eh ; Unlock W83627DHG-P

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 ; Set second as counting unit

Mov al,0f5h

Out dx,al

Inc dx

In al,dx

And al,not 08h

Out dx,al

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

Dec dx ; Set timeout interval as 10 seconds and start counting

Mov al,0f6h

Out dx,al

Inc dx

Mov al,10

Out dx,al

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

Dec dx ; Lock W83627DHG-P

Mov al,0aah

Out dx,al

2. Enable watchdog timer and set 5 minutes as timeout interval

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

Mov dx,2eh ; Unlock W83627DHG-P

Mov al,87h

Out dx,al

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