Intel MB884 - Manual (Page 29)

INSTALLATIONS
MB884 User’s Manual 25
mov
al, 01h
mov cl, 30h
call Write_Reg ;watchdog enabled
call
Lock_Chip
ret
Enable_And_Set_Watchdog Endp
;[]===============================================
; Name
: Disable_Watchdog
; IN : None
; OUT
: None
;[]===============================================
Disable_Watchdog Proc
Near
call Unlock_Chip
mov
cl, 07h
mov al, 08h
call Write_Reg ;switch to LD8
xor
al, al
mov cl, 0F6h
call Write_Reg ;clear watchdog timer
xor
al, al
mov cl, 30h
call Write_Reg ;watchdog disabled
call
Lock_Chip
ret
Disable_Watchdog Endp
;[]===============================================
; Name
: Unlock_Chip
; IN : None
; OUT
: None
;[]===============================================
Unlock_Chip Proc
Near
Mov dx, 4Eh
mov al, 87h
out dx, al
out dx, al
ret
Unlock_Chip Endp
;[]================================================
; Name
: Lock_Chip
; IN : None
; OUT
: None