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SPI TFTs and Quad SPI TFTs (Serial Peripheral Interface) is a synchronous serial data transfer protocol named by Motorola, . Here two or more serial devices are connected to each other in full-duplex mode. The devices connected to each other are either Master or Slave. In a SPI link there could as many Masters and Slaves as required, but it’s very rare to find more than one Master in a SPI link.
The Master device is the one which initiates the connection and controls it. Once the connection is initiated, then the Master and one or more Slave(s) can transmit and/or receive data. As mentioned earlier, this is a full-duplex connection, which means that Master can send data to Slave(s) and the Slave(s) can also send the data to the Master at the same time.
SPI technology is used in our EVE2 series of display powered by the FTDI FT812 and FT813 EVE2 processor.