SPI communication is previously explained in other microcontrollers: SPI is synchronous serial communication means the clock is required for communication purposes. That is a master can send data to a slave and a slave can send data to the master simultaneously. SPI has a full-duplex connection, which means that the data is sent and received simultaneously. SPI interface was found by Motorola in 1970. SPI (Serial Peripheral Interface) is a serial communication protocol.
