AXIOMTEK IMB700, Руководство пользователя

Страница: 61 / 74

IMB700 LGA4189 ATX Motherboard
Watchdog Timer 55
Appendix A
Watchdog Timer
About Watchdog Timer
Software stability is a major issue in most applications. Some embedded systems are not
watched by humans for 24 hours. It is usually too slow to wait for someone to reboot when
computer hangs. The systems need to be able to reset automatically when things go wrong.
The watchdog timer gives us that solution.
The watchdog timer is a counter that triggers a system reset when it counts down to zero from
a preset value. The software starts the counter with an initial value and must reset it
periodically. If the counter ever reaches zero which means the software has crashed, the
system will reboot.
How to Use Watchdog Timer
Start

1. Enable configuration:
-
O 2E 87
-
O 2E 87

2. Select logic device:
-
O 2E 07
-
O 2F 07

3. Enable WDT:
-
O 2E 30
-
O 2F 01

4. Activate WDT:
-
O 2E F0
-
O 2F 80

5. Set base timer:
-
O 2E F6
-
O 2F 0A ; Set reset time. Ex: A->reset time=10sec

6. Set timer unit (second or minute):
-
O 2E F5
-
O 2F 71 ; Set timer unit.
; Ex: 1->timer unit=second, 9->timer unit=minute
⚫ Timeout Value Range
◼ 1 to 255
◼ Minute / Second