Abstract
So far as the ATmega1284P (or any other ATmega used in Arduinos that I’m aware of) knows, there is no such thing as pin 1 (in the Cestino’s case.) It knows that pin only as Port B Bit 0. The digitalWrite() function essentially tells the ATmega to turn on specific bit of a port, and subsequent digitalWrite commands to other bits in that port will switch them off and on, one at a time.
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© 2016 James R. Strickland
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Strickland, J.R. (2016). 8 Bit Ports. In: Junk Box Arduino. Apress, Berkeley, CA. https://doi.org/10.1007/978-1-4842-1425-1_4
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DOI: https://doi.org/10.1007/978-1-4842-1425-1_4
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Publisher Name: Apress, Berkeley, CA
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