Capturing timer value based on external interrupt , leveraging the 62.5nsec (16MHz) resolution) of the ATMEGA328 on the Arduino Uno

[jerive]

@blh64, indeed!!

I found the issue on Sunday. I misunderstood the datasheet and was enabling the comparator interrupt as well, when what I wanted was just to enable the Analog Comparator Input Capture (ACIC bit on ACSR). It was jumping to the (undefined) comparator interrupt vector.

Thank you!