DFI NP100-N16C - Manual (Page 141)

141
B
Watchdog Timer
Appendix B - Watchdog Timer
Watchdog Timer
The following parameters are references for setting the time interval of the
Watchdog Timer function. The system will regularly be “cleared” according to the
set time interval. If the system hangs or fails to function, it will also reset ac-
cording to the time interval so that your system will continue to operate.
.model small
.386
;-------------------
;Port defination
;-------------------
SuperIo_CFG_Port EQU
2Eh ;Super I/O Config port. (2Eh/4Eh)
SuperIo_DAT_Port EQU SuperIo_CFG_Port + 1
WDT_Counter EQU 10 ; 1 to 255 (Sec./Min), 0 means disabled
mSuperio_Enter_Config Macro
mov dx, SuperIo_CFG_Port
mov al, 87h
out dx, al
NEWIODELAY
out dx, al
endM
mSuperio_Exit_Config Macro
mov dx, SuperIo_CFG_Port
mov al, 0AAh
out dx, al
endM
mSuperio_GetSet_Reg Macro RegIndex, AndMask, OrValue
mov dx, SuperIo_CFG_Port
mov al, RegIndex
out dx, al
NEWIODELAY
mov dx, SuperIo_DAT_Port
in al, dx
NEWIODELAY
mov ah, al
and al, AndMask
or al, OrValue
out dx, al
NEWIODELAY
endM