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Should say... There is NO apparent damage to the chip!

Issue solved!.
Shame on me. I managed to short 3.3V to VIN. So, the voltage applied to MK64F512 was 5V. But it was not fried, and continued working; for quite a long time, indeed. AREF voltage was...

Good morning!

I wonder if applying a voltage above 3.3 V to an analog input has an undocumented [permanent] side effect.

I’m using Teensy 3.5 in a couple of projects.

One is an adaptation...