Advantech PCE-5130, User Manual

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73 PCE-5130 User Manual
Appendix A
P
rogramming
the
W
atchdog
Timer
;-----------------------------------------------------------
Dec dx
; Lock W83627HF
Mov al,0aah
Out dx,al
5. Generate a time-out signal without timer counting
;-----------------------------------------------------------
Mov dx,2eh ; Unlock W83627HF
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
; Generate a time-out signal
Mov al,0f7h
Out dx,al ;Write 1 to bit 5 of F7 register
Inc dx
In al,dx
Or al,20h
Out
dx,al
;-----------------------------------------------------------
Dec dx
; Lock W83627HF
Mov al,0aah
Out dx,al