FabiaTech FX5638 Series, Руководство пользователя

Страница: 65 / 78

FabiaTech Corporation
Mov al,28h ; Set timeout interval as 28seconds and start counting
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 ; Select Logical Device 7 of watchdog timer
Out dx,al
Mov dx,2eh
Mov al,72h ;Index 72h- Time-Out Value and Watchdog Register
Out dx,al
Mov dx,2fh
And al,00h ;Set Bit4 to ’0’: Disabled Watchdog.
Out dx,al
61