It is sometimes is 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. The original specification uses four wires to perform full duplex communication. SPI uses a main–subnode architecture, where one main device orchestrates communication by providing the clock signal and chip select signal(s) which control any number of subservient peripherals. Motorola developed the interface in the mid-1980s, which has become a de facto standard with many variants.
Serial Peripheral Interface ( SPI) is a synchronous serial communication specification used primarily in embedded systems for short-distance wired communication between chips ( electronic devices). 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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