Watchdog Timer Configuration - IBT Technologies MB860 User Manual

Watchdog Timer Configuration

The WDT is used to generate a variety of output signals after a user
programmable count. The WDT is suitable for use in the prevention of
system lock-up, such as when software becomes trapped in a deadlock.
Under these sort of circumstances, the timer will count to zero and the
selected outputs will be driven. Under normal circumstance, the user
will restart the WDT at regular intervals before the timer counts to zero.
SAMPLE CODE:
This code and information is provided "as is" without warranty of any
kind, either expressed or implied, including but not limited to the
implied warranties of merchantability and/or fitness for a particular
purpose.
;[]================================================
; Name : Enable_And_Set_Watchdog
; IN : AL - 1sec ~ 255sec
; OUT : None
;[]================================================
Enable_And_Set_Watchdog Proc Near
push ax
call Unlock_Chip
mov cl, 2Bh
call Read_Reg
and al, NOT 10h
call Write_Reg
mov cl, 07h
mov al, 08h
call Write_Reg
mov cl, 0F5h
call Read_Reg
and al, NOT 08h
call Write_Reg
pop ax
mov cl, 0F6h
call Write_Reg
mov al, 01h
mov cl, 30h
call Write_Reg
call Lock_Chip
ret
Enable_And_Set_Watchdog Endp
;save time interval
;set GP24 as WDTO
;switch to LD8
;set count mode as second
;set watchdog timer
;watchdog enabled
MB860 User' s Manual
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