Acnodes PC 8177 - Manual (Page 55)

APPENDIX A
WATCHDOG TIMER
About Watchdog Timer
After the sys tem 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.
How to Use Watchdog Timer
Start
Un-Lock WDT:
O 2E 87 ; Un-lock super I/O
O 2E 87 ; Un-lock super I/O
Select Logic device:
O 2E 07
O 2F 08
Activate WDT:
O 2E 30
O 2F 01
Set Second or Minute:
O 2E F5
O 2F N ; N=00 or 08 (See Note below)
Set base timer:
O 2E F6
O 2F M
; M=00,01,02, …FF(Hex) ,Value=0 to 255
WDT counting re-set timer:
O 2E F6
O 2F M
; M=00,01,02, …FF
;IF to disable W DT:
O 2E 30
O 2F 00 ; Can be disabled at any time
 Timeout Value Range
 1 to 255
 Minute / Second