General-purpose input/output (GPIO)

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FidoKey rev. a - top view.jpg

A general-purpose input/output (GPIO) is an uncommitted digital signal pin on an integrated circuit or electronic circuit board which may be used as an input or output, or both, and is controllable by the user at runtime.

Looking at a STM32 MCU package we will notice a number of similarly named pins:

STM32F40xxx LQFP64 pinout.png

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