A.3 Sample Program - AXIOMTEK PICO840 User Manual

PICO840/842 Pico-ITX Board

A.3 Sample Program

Assembly sample code :
;Enable WDT:
mov dx,2Eh
mov al,87
out dx,al
out dx,al
;Select Logic device:
mov dx,2Eh
mov al,07h
out dx,al
mov dx,2Fh
mov al,07h
out dx,al
;Enable WDT base address:
mov dx,2Eh
mov al,30h
out dx,al
mov dx,2Fh
mov al,01h
out dx,al
;Activate WDT:
mov dx,2Eh
mov al,0F0h
out dx,al
mov dx,2Fh
mov al,80h
out dx,al
;Set base timer :
mov dx,2Eh
mov al,0F6h
out dx,al
mov dx,2Fh
mov al,Mh
out dx,al
;Set Second or Minute :
mov dx,2Eh
mov al,0F5h
out dx,al
mov dx,2Fh
mov al,Nh
out dx,al
Note:
If N=71h, 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
60
;Un-lock super I/O
;M=00h,01h,...FFh (hex),Value=0 to 255
Note
;(see below
;N=71h or 79h(see below
)
Note
)
BIOS Flash Utility