Precautions When Using Watchdog Timer - Fujitsu F2MC-16LX Hardware Manual

CHAPTER 10 WATCHDOG TIMER
10.5

Precautions when Using Watchdog Timer

This section explains precautions when using watchdog timer.
Precautions when Using Watchdog Timer
Stopping watchdog timer
Once the watchdog time is activated, it cannot stop until power-on or a watchdog-external reset occurs.
Interval Time
Because the interval time uses carry-up signals from the timebase timer, as the count clock, clearing the
timebase timer may make the interval time of the watch dog timer longer than the preset period of time.
Selecting Interval Time
The interval time can be set when activating the watchdog timer. Data written after the activation of the
watchdog timer is ignored.
Precautions when creating program
When creating a program that clears the watchdog timer repeatedly in the main loop, the main loop
processing time including the interrupt processing must not exceed the minimum interval time of the
watchdog timer.
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