Situation: You want to include a timer interrupt service routine in an assembly language program for an AVR-based Arduino. The program will be written, assembled and uploaded using the Arduino IDE.

This project demonstrates an interrupt-based embedded system built using the Arduino Nano 33 IoT, a BH1750 light sensor, and a slide switch. The built-in LED is controlled through external ...

but instead I found such an thorough and well thought-through answer on StackExchange that I thought I had to point it out. So, t0 the question: What is AVR Arduino interrupt latency? And how can it ...