CAPA831 Intel
®
Atom
TM
D2550/N2800/N2600 Processor 3.5” SBC
64
Watchdog Timer
Sample Program
Assembly sample code :
;Enable WDT:
mov dx,2Eh
mov
al,87
;Un-lock super I/O
out dx,al
out dx,al
;Select Logic device:
mov dx,2Eh
mov al,07h
out dx,al
mov dx,2Fh
mov al,08h
out dx,al
;Activate WDT:
mov dx,2Eh
mov al,30h
out dx,al
mov dx,2Fh
mov al,01h
out dx,al
;Set Second or Minute :
mov dx,2Eh
mov al,0F5h
out dx,al
mov dx,2Fh
mov al,Nh
;N=00h or 08h(see below
Note)
out dx,al
;Set base timer :
mov dx,2Eh
mov al,0F6h
out dx,al
mov dx,2Fh
mov al,Mh
;M=00h,01h,...FFh (hex),Value=0 to 255
out dx,al
;(see
below
Note)
;Disable WDT:
mov dx,2Eh
mov al,30h
out dx,al
mov dx,2Fh
mov
al,00h
;Can be disabled at any time
out dx,al
Note:
If N=00h, the time base is set to second.
M = time value
00: Time-out Disable
01: Time-out occurs after 1 second
02: Time-out occurs after 2 seconds
03: Time-out occurs after 3 seconds
.
.
FFh: Time-out occurs after 255 seconds
Summary of Contents for CAPA831
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Page 37: ...CAPA831 Intel AtomTM D2550 N2800 N2600 Processor 3 5 SBC 30 Hardware Description...
