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Question about NRST pin on STM32F051

Question asked by von_ahnen.michael on Jan 29, 2015
Latest reply on Jan 29, 2015 by waclawek.jan
We have a design were we are periodically going into stop mode, waking up on a RTC interrupt, running some code, then going back to stop mode.  Every time the processor wakes up, the NRST pin goes low for approximately low for 25 usec.  The pin is not being driven externally, so it appears to be responding to an internal reset.

What would cause this behavior?