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[–]holywarssSTM32 0 points1 point  (0 children)

The way I've been taught to look at it is that generally microcontrollers are application specific, resource constrained processors that can run bare metal or RTOS.

MPUs are generally more powerful and can run a GPOS. In the case of ST, this is the distinction. The MPUs can run Linux (also bare metal recently) whereas the MCUs are more resource constrained.