FabiaTech FB2701, User Manual

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FabiaTech Corporation
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Watchdog Timer Setting
The watchdog timer is a circuit that may be used from your program software to
detect system crashes or hang-ups. The watchdog timer is automatically disabled
after reset.
Once you have enabled the watchdog timer, your program must trigger the
watchdog timer every time before it times out. After you trigger the watchdog timer, it
will be set to non-zero value to watchdog counter and start to count down again. If
your program fails to trigger the watchdog timer before time-out, it will generate a
reset pulse to reset the system.
The factor of the watchdog timer time-out constant is approximately 1 second. The
period for the watchdog timer time-out is between 1 to FFFF timer factors.
If you want to reset your system when watchdog times out, the following table listed
the relation of timer factors between time-out periods.
Time Factor
Time-Out Period
(Seconds)
Time-Out Period
(Minutes)
1 1 1
2 2 2
3 3 3
4 4 4
5 5 5
“ “ “
“ “ “
“ “ “
FFFF FFFF FFFF