AVR-Chat

> In the book Excel by Example, it teaches you how to create a sheat
> to calculate the MCU cycles based on assembly file.
> This will be more acurate than using an Osciloscope, but not easier.

I agree in principle, but in practice, with non-trivial routines, it
becomes unwieldy to calculate every possibility. Much easier to scope
it, throw real data in, and measure min and max.  Besides, simulated
results are just that. Simulated.  You might miss a path, but the
running code won't.