INSTALLATIONS
MB820 User’s Manual
25
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
;save
time
interval
call
Unlock_Chip
mov
cl,
2Bh
call
Read_Reg
and al, NOT 10h
call
Write_Reg
;set
GP24
as
WDTO
mov
cl,
07h
mov
al,
08h
call
Write_Reg
;switch
to
LD8
