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About This Manual. This document describes the features, architecture and registers associated with the serial peripheral interface (SPI) module. This document specifies the Serial Peripheral Interface (SPI) that is used in the SCA61T, SCA100T,. SCA103T, SCA1000, and SCA1020 –series sensors. THE SPI SPI signals include the standard Serial Clock (SCLK), Master In Slave Out (MISO), Master Out. Slave In (MOSI), bidirectional Serial Data (SDAT), and Slave SPI is a synchronous protocol that allows a master device to initiate communication discussed later and can be found in detail in the device data sheet. The SPI is a synchronous serial interface in which data in an 8-bit byte can be shifted in and/or out one bit at a time. It can be used to.Must read and understand the data sheet. SPI flow control… The SPI spec allows for different clock frequencies and different clock polarities. 01234567.