AXIOMTEK SBC87842, User Manual

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SBC87842 Single Board Computer
Watchdog Timer 47
Appendix A
Watchdog Timer
A.1 About Watchdog Timer
After the system stops working for a while, it can be auto-reset by the watchdog timer. The
integrated watchdog timer can be set up in the system reset mode by program.
A.2 How to Use Watchdog Timer
The following example enables configuration using debug tool.
Enable WDT

Enable configuration:
O 2E 87 ; Un-lock super I/O
O 2E 87

Select logic device:
O 2E 07
O 2F 08

WDT device enable:
O 2E 30
O 2F 01

Set timer unit:
O 2E F0
O 2F 00 ; (00: Sec; 08:Minute)

Set base timer:
O 2E F1
O 2F 0A ; Set reset time (where 0A (hex) = 10sec)
Disable WDT

Enable configuration:
O 2E 87 ; Un-lock super I/O
O 2E 87

Select logic device:
O 2E 07
O 2F 08

WDT device disable:
O 2E 30
O 2F 00