SBC82810 Pentium
®
M All-in-One Half-Size Board User’s Manual
Watchdog Timer
63
A p p e n d i x A
Watchdog Timer
Watchdog Features
The Watchdog Timer (WDT) supports the following features and
functions:
Selectable prescaler – approximately 1 MHz and approximately 1 KHz
33 MHz clock (30 ns clock ticks)
Multiple modes: WDT and free-running
z
Free-running mode:
One stage timer.
Toggles reset system after programmable time.
BIOS (Hance Rapid Item) can test this function, you can setup the
time from 1~1024 sec. System enable timer after boot.
z
WDT Mode:
Two stage timer:
1. First stage generates IRQ and SMI interrupt after programmable
time.
2. Second stage reset system or inverts the previous value.
Used only after first timeout occurs.
Status bit preserved in RTC well for possible error detection and
correction.Reset system when OUTPUT is enabled.
Timer may be disabled (default state) or locked (hard reset required to
disable WDT). WDT automatic reload of preload value when WDT
reload sequence is performed
