Intel IB850 Manual De Usuario

 

 
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