General-purpose input-output


General-purpose input-output (GPIO) is a generic pin on an integrated circuit or computer board whose behavior—including whether it is an input or output pin—is controllable by the user at run time.

General-purpose input-outputs is NOT Standardized and varies based on the platform or vendor.

General-purpose input-output pins have no predefined purpose, and go unused by default.

General-purpose input-output's idea is that sometimes a system integrator who is building a full system might need a handful of additional digital control lines—and having these available from a chip avoids having to arrange additional circuitry to provide them.

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