![]() SPI may be accurately described as a synchronous serial interface, but it is different from the Synchronous Serial Interface (SSI) protocol. Typical applications include interfacing microcontrollers with peripheral chips for Secure Digital cards, liquid crystal displays, analog-to-digital and digital-to-analog converters, flash and EEPROM memory, and various communication chips. It is sometimes called a four-wire serial bus to contrast with three-wire variants which are half duplex, and with the two-wire I☬ and 1-Wire serial buses. Motorola's original specification uses four wires to perform full duplex communication. SPI uses a main–subnode (master/slave) architecture, where one main device orchestrates communication by providing the clock signal and chip select signal(s) which control any number of subservient peripherals. ![]() ![]() Serial Peripheral Interface ( SPI) is a de facto standard (with many variants) for synchronous serial communication, used primarily in embedded systems for short-distance wired communication between integrated circuits. This article may need to be rewritten to comply with Wikipedia's quality standards, as it reads like a guide or textbook.
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