User`s manual

PICO820 Series All-In-One PICO ITX Board User’s Manual
Watchdog Timer
65
APPENDIX A
WATCHDOG TIMER
Watchdog Timer Setting
(From Super I/O W83627HG-AW)
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.
Using the Watchdog Function
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 below table)

Set base timer :
O 2E F6
O 2F M=00,01,02,…FF(Hex) ,Value=0 to 255

; IF to disable WDT:
O 2E 30
O 2F 00 ; Can be disable at any time