Aaeon PCM-6897/L, Manual

Page: 61 / 69

Compact Board P C M - 6 8 9 7 / L
Appendix A Programming the Watchdog Timer
A -4
This register is write only. Its values are not sticky; that is to say, a
hardware reset will automatically clear the bits, and does not require
the software to clear them.
Bit Description
7-2 Reserved
1 Returns to the Wait for Key state. This bit is used when the
configuration sequence is completed
0 Resets all logical devices and restores configuration registers
to their power-on states.
WatchDog Timer Control Register (Index=71h, Default=00h)
Bit Description
7 WDT is reset upon a CIR interrupt
6 WDT is reset upon a KBC (mouse) interrupt
5 WDT is reset upon a KBC (keyboard) interrupt
4 WDT is reset upon a read or a write to the Game Port base
address
3-2 Reserved
1 Force Time-out. This bit is self-clearing
0 WDT Status
1: WDT value reaches 0.
0: WDT value is not 0
WatchDog Timer Configuration Register (Index=72h,
Default=00h)
Bit Description
7 WDT Time-out value select
1: Second
0: Minute