Hi

>> What is most probably causing your problem is contact noise

You were right. 

Putting 0.1uF capacitor in parallel with 100K resistor and connecting them
to the INT0 and the ground helped filtered that bounce out, as u suggested. 

Also thank you for the pointers to the datasheet form Microchip. 

I haven't put any counter(s) into the ISR routine, because I would first
need to add an LCD or something to see/read the value :)

Interrupt is now processed (almost) every time correctly. Unless I somehow
push that switch button "awkwardly" then it may get triggered twice (or at
least it looks like it was twice). 

There must be some better push switch than that (this is the current guy:
http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&sto
reId=10001&catalogId=10001&productId=106112 , JAMECO part #106112). 

I'll look for something more robust and hopefully less noisy. 

Thanks,
Robertino 


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