zlacker

>>1317+(OP)
Can someone explain why the EMI would cause a Bitflip and not always a high read? Why would a pulse invert the signal that’s read? Don’t the voltages effectively get added?

>>echoan+An1
Sign matters as well as magnitude. The pulse created will have both a positive and negative part - waveform sort of like --^v-- and so you can get either direction bit flip. It's not equivalent to connecting a battery to the pin; EMI's more like AC in that it goes both directions.