Peak 550/PISA 550 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