Serial Peripheral Interface: Difference between revisions

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'''Serial Peripheral Interface''' ('''SPI''') is a <!--DO NOT ITALICIZE; CONSIDERED ANGLICIZED-->[[de facto standard]] (with many [[#Variations|variants]]) for [[Comparison of synchronous and asynchronous signalling|synchronous]] [[serial communication]], used primarily in [[embedded systems]] for short-distance [[wired communication]] between [[integrated circuits]].

SPI follows a [[master–slave (technology)|master–slave architecture]],<ref name=":0">{{Cite web |last=Stoicescu |first=Alin |date=2018 |title=Getting Started with SPI |url=https://ww1.microchip.com/downloads/en/Appnotes/TB3215-Getting-Started-with-SPI-90003215A.pdf |url-status=live |website=[[Microchip]]}}</ref> where a master device [[Signaling (telecommunications)|orchestrates communication]] with one or more slave devices by driving the [[clock signal|clock]] and [[chip select]] signals. Some devices support changing master and slave roles on the fly.

[[Motorola]]'s original specification (from the early 1980s) uses four [[logic signal]]s, aka lines or wires, to support [[full duplex]] communication. It is sometimes called a ''four-wire'' [[serial bus]] to contrast with [[Serial Peripheral Interface#Three-wire|three-wire]] variants which are [[half duplex]], and with the ''two-wire'' [[I²C]] and [[1-Wire]] serial buses.