FUJITSU Semiconductor Controller MB89950/950A - Manual (Page 132)

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CHAPTER 6 WATCHDOG TIMER
6.5 Notes on Using Watchdog Timer
This section lists points to note when using the watchdog timer.
■ Notes on using watchdog timer
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Stopping watchdog timer
Once activated, the watchdog timer cannot stop until a reset generates.
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Clearing watchdog timer
Clearing the counter being used as a count clock of the watchdog timer (timebase timer or watch prescaler)
also simultaneously clears the watchdog timer counter.
The watchdog timer counter is cleared when entering sleep or stop mode.
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Notes on programming
When writing a program in which the watchdog timer is repeatedly cleared in the main loop, including
interrupt processing, it should be less than the minimum watchdog timer interval time.