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=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> called ''main–sub'' herein, {{NoteTag|Using main and sub maintains the same initial letters to remain in sync with the line names. For example MISO could be expanded as "main in, sub out"}} {{NoteTag|The {{slink||Alternative terminology}} section gives more details on proposed alternativealternatives terminology. See(see [[Talk:Serial Peripheral Interface#Terminology|the talk page]] for andiscussion). ongoingThis discussionarticle uses "main" and "sub" to maintain the "MOSI" and "MISO" pin abbreviations.}} 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 one or more sub (peripheral) devices by driving the [[clock signal|clock]] and [[chip select]] signals.

[[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.