@DrAzzy - just a couple of pullup/pulldown resistors and an assortment of bypass capacitors. It also needs its 3.3V from somewhere and 0/1/2 clock sources depending on your needs. It seems quite resilient to things like missing capacitors and voltage range, but I've been reading up about bypass capacitors and grounding and it looks like there's plenty of other reasons for getting the capacitors right, it's not about getting the MCU to run.
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