SSI Protocol employs and provides only a single channel. The SPI may be accurately described as a synchronous serial interface, but it is different from the (SSI) protocol, which is also a four-wire synchronous serial communication protocol. Sometimes SPI is called a four-wire serial bus, contrasting with, and serial buses. Multiple slave devices are supported through selection with individual (SS) lines. The master device originates the for reading and writing. SPI devices communicate in mode using a architecture with a single master. The interface was developed by in the mid 1980s and has become a. In telecommunications, RS-232, Recommended Standard 232 is a standard introduced in 1960 for serial communication transmission of data.
Single Master to Single Slave: basic SPI bus example.
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