Axiom SBC8156, User Manual

Page: 73 / 96

SBC8156 Pentium All-in-One CPU Card Series User’s Manual
Watchdog Timer
19
' * '
+,
)5:5)!
>
#$%
1. To enable the watchdog function, read I/O port 121H (e.g., “I
121”) under “debug” of MS-DOS environment. To disable the
function, place I/O port 120H under “debug” of MS-DOS
environment.
Reset Watchdog -Read I/O Port 121H
Disable Watchdog - Read I/O Port 120H
In system Run_Time, you still have to read I/O Port 121H to
reset the Watchdog timer.
If the system fails, the TSR should be stopped for the
Watchdog Reset to be activated.
2. Set the corresponding Watchdog option in the Integrated
Peripherals menu of the CMOS Setup utility. The available
Time-out Trigger options are 0.5, 1, 5, 10, 20, 50, 100, 150,
200, 250, 300, 350, 400, 450, 500 and 1000 sec(s).