Appendix Awatchdog Timer; About Watchdog Timer; How To Use Watchdog Timer - AXIOMTEK ICO520 Series User Manual

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 a program.

How to Use Watchdog Timer

The following example shows how to enable configuration using a debug tool.
Step Description
1 Enter configuration mode
2 Select logic device
3 Set timer value
4 Clear WDT status
(optional)
5 Set time unit and start
WDT
Watchdog Timer
WATCHDOG TIMER
Sample code Note
O 2E 87 Un-lock super I/O
O 2E 87
O 2E 07 Select logic register
O 2F 07 Switch to WDT device
O 2E F6 Select logic register
O 2F 05 Timer value 0~255 (Sec/Min) (Ex: 5)
O 2E F5 Select logic register
O 2F 40
O 2E F5 Select logic register
O 2F M M = 28h (Minute) ,
M = 20h (Second)
ICO520 Series User's Manual
APPENDIX A
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