Editing General-purpose input/output (section)

==Implementation==
GPIO interfaces vary widely. In some cases, they are simple—a group of pins that can switch as a group to either input or output. In others, each pin can be set up to accept or source different logic voltages, with configurable drive strengths and [[Pull-up resistor|pull ups/downs]]. Input and output voltages are usually, but not always, limited to the supply voltage of the device with the GPIOs, and may be damaged by greater voltages.

A GPIO pin's state may be exposed to the software developer through one of a number of different interfaces, such as a [[memory-mapped I/O]] peripheral, or through dedicated IO port instructions. Some GPIOs have 5&nbsp;V tolerant inputs: even when the device has a low supply voltage (such as 2&nbsp;V), the device can accept 5&nbsp;V without damage.

A GPIO port is a group of GPIO pins (often 8 pins, but it may be fewer) arranged in a group and controlled as a group.

GPIO abilities may include:<ref name=":0" />
* GPIO pins can be configured to be input or output
* GPIO pins can be enabled/disabled
* Input values are readable (usually [[Binary number|high or low]])
* Output values are writable/readable
* Input values can often be used as [[interrupt|IRQs]] (usually for wakeup events)