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@Jean-Philippe_Rey
In order to achieve a bidirectional protocol (PS/2 mouse), I have to simultaneously monitor a pin with a setWatch, and drive it (open drain with external pull-ups).
I set this pin LOW with digitalWrite(X,false), and HIGH with pinMode(X,'input') (External pullup drives it HIGH ).
What is happening with the previously declared setWatch on this pin? Does it remains active or is it discarded as soon as I drive this pin with digitalWrite?