Timer interrupt latency on the ATmega328

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How long does it take before an interrupt service routine is started on an ATmega328 after the actual trigger event?

The answer is: about 19-20 CPU clock cycles as you can see in the video.
  1. Uwe Zimmermann
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But, this is written in C. Doesn't the compiler output a few PUSH instructions at entry intro an interrupt? It would be very interesting to know what the actual latency is, for a naked interrupt. Also, it might be worth noting where the jitter comes from. I'm fairly certain that depending on whether the CPU is executing a 1, 2 or 3 cycle instruction at the time the interrupt occurs, the interrupt may be delayed - leading to exactly what we see here :) Very nice video, I like your channel!

SenseiTG
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Uwe, Thanks very much for the video like that or the previous one. When Arduino era came nobody really cares about that. Only the library os some kind and fast forward 😀 to not optimal success. I started to get to know about the problems you show using 8051 family and assembler of course.

tomaszrybicki