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Appendix a watchdog timer, About watchdog timer, How to use watchdog timer – Acnodes PC 8177 User Manual

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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