Typical bus speeds are in the 50 MHz range. There is no standard set of speeds defined for the SPI protocol. The slave has no means of implementing/enforcing flow control and is expected to process all the data that it receives. The master controls the clock, so it can potentially use that to implement some form of flow control, but it is rarely done. There is no possibility for flow control in this protocol. In case either the master or the slave has no data to send, they can send 0 s. In each clock cycle, the master sends 1 bit to the slave, and the slave sends 1 bit to the master. The master then proceeds to operate the SCLK at a frequency less than or equal to the maximum frequency supported by the slave (typical speeds are in the MHz range). 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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