Appendix A: Watchdog Timer - Nexcom NDiS B533 User Manual

Appendix A: Watchdog Timer

Appendix A: Watchdog Timer
NDiS B533 features a watchdog timer that resets the CPU or generates an
interrupt if the processor stops operating for any reason. This feature ensures
system reliability in industrial standalone or unmanned environments.
Watchdog Timer Control Register
(Index=71h, Default=00h)
Bit
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.
WDT Status
0 1: WDT value reaches 0.
0: WDT value is not 0.
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NDiS B533 User Manual