Serial Peripheral Interface

<communications, hardware> (SPI) A serial interface in which a master device supplies clock pulses to exchanges data serially with a slave over two data wires (Master-Slave and Slave-Master).

This term probably originated with Motorola in about 1979 with their first all-in-one microcontroller.

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serialise serialize serial line Serial Line Internet Protocol Serial Line IP	SPI	serial port Serial Presence Detect serial processing Serial Storage Architecture serve