You are right, I agree we don't understand each other very much.
I've just put a print routine in te ISR and set Sol01 to 30 and the printout counted "32" interrupts and "30" for a variable in the "Do...Loop" circle. (Int0= Falling)
Next I'll take a ATtiny 84 and will see how this chip will behave.
I thank you for the support so far and I'll give a message about the final outcome.
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