OperationĮach transaction begins with the master selecting a slave using the SS line. For a bus configuration where n slaves are connected to a master, (3 + n) pins will be required on the master. The SCLK, MOSI, and MISO lines are shared between all slaves. So, if n slaves are connected to a master in an SPI bus configuration, n SS pins are required on the master. The SS line is used by the master to select the slave that it wishes to communicate with.
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