
2.4 Watchdog Timer Setting
The watchdog timer makes the systems auto-reset while it stop to work for a period.
The onboard watchdog timer can be setup as system reset or active NMI mode by
jumper JWDT.
Jumper: JWDT
Type: onboard 3-pin header
JWDT Watchdog Timer
1-2 Active NMI
2-3 Reset
Default setting
JWDT
1
2
3
Program Sample
Watchdog timer setup as system reset with 5 second of timeout
2E, 87
2E, 87
2E, 07
2F, 08 Logical Device 8
2E, 30 Activate
2F, 01
2E, F5 Set as Second*
2F, 00
2E, F6 Set as 5
2F, 05
* Minute: bit 3 = 0; Second: bit 3 = 1
FS-977 User’s Manual
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