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I tried to refresh independent watchdog timer, instead it reset. Why?

Latest Updated:05/27/2013

Question:

I tried to refresh the independent watchdog timer (IWDT), but instead it reset. Why?

Answer:

Make sure that the upper byte in the IWDTCR is 0x33.
If 0x33 is not written to the upper byte, the IWDT will not operate normally.

 

Suitable Products
RX62N, RX621
RX62T