180MHz with "Faster" optimization. Teensyduino 1.53 with Arduino 1.8.13. As a side note, Paul's work and the Teensy community have enabled me to build prototypes amazingly quickly, and I am incredibly thankful for the...
Thanks everyone for reading along and for your suggestions. Here's one last update: I did a test with a brand new Teensy 3.6 and nothing physically connected to it (photo) other than the USB. Simply a 4K7 resistor...
I have done an extensive amount of testing, and have come to the surprising conclusion that the failure is indeed caused by the code -- not by an external voltage spike. I know, it sounds ridiculous, I thought so too,...