![]() Slave Select/Chip Select (SS/CS) – the connection used by the master device to inform the slave device that it will send or request data.Serial Clock (SCLK) – the line that carries the clock pulse generated by the master device.Master In Slave Out (MISO) – the connection for the slave device to send data back to the master device.Master Out Slave In (MOSI) – the connection for the master device to send data to the slave device.Each master and slave device has the following pins: The SPI bus refers to the wires that connect the master device to the slave devices. There can be one or more slave devices in an SPI network. The slave device receives commands from the master device, and sends data back to the master device. There is only one master device in an SPI network. The master device sends data to, and receives data from slave devices. ![]() Parts of an SPI NetworkĪn SPI network consists of a master device and one or more slave devices connected on a bus. It should only be used for communication between devices that are less than 10 meters apart. SPI communication isn’t good for transmitting data over long distances. SPI is a type of synchronous serial communication, which means that data transfer is timed with clock pulses. SPI is an acronym for Serial Parallel Interface.
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