DFI EC300 Series, User Manual

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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 defi nation
;-------------------
SuperIo_CFG_Port EQU
2Eh ;Super I/O Confi g port. (2Eh/4Eh)
SuperIo_DAT_Port EQU SuperIo_CF 1
WDT_Counter EQU 10 ; 1 to 255 (Sec./Min), 0 means disabled
mSuperio_Enter_Confi g Macro
mov dx, SuperIo_CFG_Port
mov al, 87h
out dx, al
NEWIODELAY
out
dx, al
endM
mSuperio_Exit_Confi g 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
mSuperio_Get_Reg Macro RegIndex
mov
dx, SuperIo_CFG_Port
mov al, RegIndex
out dx, al