Connecting Bidirectional Pins to a Power net

I prefer to leave unused pins unconnected (or maybe with a pad for future experimentation) and then make them outputs with a 0 value.

In reality the best solution depends on what your priorities and objectives are and what options your MCU offers you: are you looking for lowest power consumption, best EMI performance, future use of the pin, etc.

I found this post is quite thought provoking: microcontroller - Unused MCU pins, better to tie to GND or use software to prevent floating? - Electrical Engineering Stack Exchange

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