Would connecting VCC to the TX pin be bad?

I'm using an Arduino Uno rev.3 and i started wondering . Would it be bad for the board to connect the 5V VCC pin to the serial TX output pin ( even over time ) ?

Yes of course it would, the TX pin will be in output mode during upload and any time Serial transmission happens, It will switch between 5v+ & GND, and when it is the latter state, there is 5v on the pin which is grounded, without any current limiting. The pin will burn instantly.

and that's bad . Thanks :+1:

Or logic HIGH and logic LOW as by definition/design 5V is the solid 5V rail and GND is the solid 0V without any pull-up or pull-down respectively?

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