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The function Serial.print() and it's siblings cuts all leading zeros. So 0b00001111 get's displayed as 1111 and 0b00000000 as 0. So you actually get what you expect. It's just printing different. Also, when reading PORTF, you actually read the output state of the pins, as you have set it before. If you want to read the real input level of the pins, you ...


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On all of the new boards I had tested (excluding the first one that I said worked), I had not burned the bootloader. Burning the bootloader made the timing normal! If anyone can tell me why that's the case, I'll accept your answer as the "correct" answer.


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Factor 8 in timing smells like wrong fuses. Perhaps you don't use an external oscillator, but the internal one?


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