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Understood. But, over the frequency range I'm looking at, the readings are the same whether fed an analog signal or square waves. That saves me having to use a Schmitt trigger on the input but I could do that if necessary.

Thanks - did it, guess it worked.

New to this forum and Teensy. The goal, using Teensy 4.0, is a frequency counter that can read frequency up to 35 MHz with an accuracy to the nearest 100 Khz. It should be reasonably responsive to frequency changes as it's reading the frequency resulting from someone turning a knob on an...