tBOX110-APL-TV U
ser’s Manual
Watchdog Timer
41
APPENDIX A
WATCHDOG TIMER
About Watchdog Timer
After the system stops working for a while, it will be auto-reset by the watchdog timer. The
integrated watchdog timer can be set up in the system reset mode by program.
How to Use Watchdog Timer
The following example enables configuration using a debug tool.
Enable WDT
Enable configuration:
O 2E 87 ; Un-lock super I/O
O 2E 87
Select logic device:
O 2E 07 ;
Select logic register
O 2F 07 ;
Switch to WDT device
Set timer value:
O 2E F6 ;
Select logic register
O 2F 05 ;
Timer value 0~255 (Sec/Min) (Ex:
5
)
Clear WDT status (optional)
:
O 2E F5 ;
O 2F 40
Set base timer:
O 2E F5
O 2F M ;
M = 28h (Minute)
M = 20h (Second)
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