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Hi,

Firstly I think it's fine with the calculation method, but in the actual applications, we always need to give this reset time a certain margin, ensure that even in the worst case (such as slow power supply rise time, noise interference, etc.), NRST can still maintain a low level duration (>29μs) to trigger a reset. Therefore, if there is no special requirement for reset time, leaving enough reset time can help improve system stability, which means recommend 315us rather than 31.5us that is closely to the requirements.

Best Regards,
Peter