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Getting to know the SPI bus' structure, operation

Posted: 19 Oct 2009     Print Version  Bookmark and Share

Keywords:SPI bus  serial data link  data transfer 

The SPI bus is a synchronous serial data link operating in full-duplex mode. It is used to exchange data between a single master and one or multiple slaves. Its simple implementation uses only four signal lines for data and control.

SPI data rates are commonly in the range of 1 to 70 MHz and byte lengths can range from 8- and 12-bits to multiples of these values.

Data transfers always consist of a data exchange. While the master is sending data to the slave, the slave sends data to the master. For this reason, the master's internal shift registers and slave are set-up in a ring formation.

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