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Why is it necessary to clear (RUN = 1) the watchdog timer in STOP mode?

Latest Updated:12/01/2011

Question:

The watchdog timer (WDT) stops in the STOP mode.
Why then is it necessary to clear (RUN = 1) the watchdog timer prior to entering the STOP mode?

Answer:

Because the watchdog timer may overflow immediately before entering the STOP mode.
If it does, the system cannot enter the STOP mode.
To avoid this problem, WDT is cleared prior to entering the STOP mode.
Suitable Products
V850 Family