AAEON PFM-541I User Manual
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P C / 1 0 4 C P U M o d u l e
P F M - 5 4 1 I
Appendix A Programming the Watchdog Timer A-2
A.1 Programming
PFM-541I utilizes SCH3114-NU chipset as its watchdog timer
controller.
The SCH311X WDT ( Watch Dog Timer ) has a programmable
time-out ranging from 1 to 255 minutes with one minute resolution,
or 1 to 255 second resolution. The unit of the WDT timeout value
are selected via bit[7] of the WDT_TIMEOUT register. The WDT
time-out value is set through the WDT_VAL Runtime register.
Setting The WDT_VAL register to 0x00 disables the WDT function
(this is its power on default).
Setting the WDT_VAL to any other non-zero value will cause the
WDT to reload and begin counting down from the value loaded.
When the WDT count value reaches zero the counter stops and
sets the Watchdog time-out status bit in the WDT_CTRL Runtime
register. Note: Regardless of the current state of the WDT, the WDT
time-out status bit can be directly set or cleared by the Host CPU.
The related register for configuring WDT is list as follows: