Special input/output

Special input/output (Special I/O or SIO) are inputs and/or outputs of a microcontroller designated to perform specialized functions or have specialized features.^[1]

Specialized functions can include:

Hardware interrupts,
analog input or output
PWM output
Serial communication, such as UART, USART, SPI bus, or SerDes.
External reset
Switch debounce
Input pull-up (or -down) resistors
open collector output

Some kinds of special I/O functions can sometimes be emulated with general-purpose input/output and bit banging software.

See also

Atari SIO

References

↑ Special Microcontroller Functions, retrieved 29 October 2011

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