Serial Peripheral Interface: Difference between revisions

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'''Serial Peripheral Interface''' ('''SPI''') is a [[de facto standard|''de facto'' standard]] (with many [[#StandardsVariations|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 uses a [[master–slave (technology)|master–slave architecture]], described here with the terms "main" and "sub",{{NoteTag|The {{slink||Alternative terminology}} section gives more details on proposed alternative terminology. See [[Talk:Serial Peripheral Interface#Terminology|the talk page]] for an ongoing discussion.}} <ref name=":0">{{Cite web |last=Dhaker |first=Piyu |date=2018 |title=Introduction to SPI Interface |url=https://www.analog.com/en/analog-dialogue/articles/introduction-to-spi-interface.html |url-status=live |archive-url=https://web.archive.org/web/20230525152752/https://www.analog.com/en/analog-dialogue/articles/introduction-to-spi-interface.html |archive-date=2023-05-25 |access-date=2023-07-21 |website=[[Analog Dialogue]]}}</ref> where one{{NoteTag|For any given transaction, only one device is the main. However, some devices support changing main and sub roles on the fly. Most microcontrollers can easily reconfigure their SPI's role, and some Atmel and Silabs devices can change roles depending on an external pin.}} main device [[Signaling (telecommunications)|orchestrates communication]] with some number of peripheral (sub) devices by driving the [[clock signal]] and [[chip select]] signal(s).