Watchdog Timer Trigger; Watchdog Timer Disabled - FabiaTech FX5638 Series User Manual

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Mov al,28h
Out dx,al
;------------------------------------------
; Exit extended function mode
;------------------------------------------
Mov dx,2eh
Mov al,01h
Out dx,al

Watchdog Timer Trigger

After you enable the watchdog timer, your program must write the same factor as
enabling to the watchdog register at least once every time-out period to its
previous setting. You can change the time-out period by writing another timer
factor to the watchdog register at any time, and you must trigger the watchdog
before the new time-out period in next trigger.

Watchdog Timer Disabled

To disable the watchdog timer, simply write a 00H to the watchdog register.
;--------------------------------------------------------------------------------------------------------------
; Logical device 7, configuration registers Index 72h Bit 4
;--------------------------------------------------------------------------------------------------------------
Mov dx,2fh
Mov al,07h
Out dx,al
Mov dx,2eh
Mov al,72h
Out dx,al
Mov dx,2fh
And al,00h
Out dx,al
; Set timeout interval as 28seconds and start counting
; Select Logical Device 7 of watchdog timer
;Index 72h- Time-Out Value and Watchdog Register
;Set Bit4 to '0': Disabled Watchdog.
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