Hi folks! I’ve recently acquired an Arduino Micro and I’m confused by the number of I/O pins stated on the website (20 pins) vs. what I’m able to see in the schematics and pin-out diagram (24 pins). Are the MOSI, SS, MISO and SCK-pins not useable for digital I/O? Nothing in the datasheet hints in …

How many pins of the Arduino Micro are really useable as digital I/O pins?

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