AXIOMTEK SHB130 Series, User Manual

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SHB130 LGA1150 Full-size CPU Card
Watchdog Timer 53
Appendix A
Watchdog Timer
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.
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

Set Second or Minute:
O 2E F0
O 2F N ; N=00 or 08 (See Note below)

Set base timer:
O 2E F1
O 2F M ; M
=00,01,02,…FF(Hex) ,Value=0 to 255

WDT counting re-set timer:
O 2E F1
O 2F M
; M=00,01,02,…FF (See
Note below)

IF No re-set timer:
; WDT time-out, generate RESET
;IF to disable WDT:
O 2E 30
O 2F 00 ; Can be disabled at any time

Timeout Value Range
 1 to 255
 Minute / Second