Nexcom Peak 555A User Manual page 90

Peak 555A User's Guide
b. Select WDT timer setting (use port F2)
MOV AL, 06
MOV DX, 0F2
OUT DX, AL
c. Select WDT for NMI or reset (select NMI)
MOV DX, 70
MOV AL, 7D
OUT DX, AL
MOV DX, 71
IN AL, DX
OR AL, 10
MOV DX, 0F2
OUT DX, AL
MOV BL, AL
MOV DX, 70
MOV AL, 7D
OUT DX, AL
MOV DX, 71
MOV AL, BL
OUT DX, AL
d. Enable WDT
MOV DX, 70
MOV AL, 7D
OUT DX, AL
MOV DX, 71
IN AL, DX
OR AL, 08
MOV DX, 0F2
OUT DX, AL
MOV BL, AL
MOV DX, 70
MOV AL, 7D
OUT DX, AL
MOV DX, 71
MOV AL, BL
OUT DX, AL
Watch Dog Timer
; Setting WDT=1 sec.
A-5