31.1 Overview

The Serial Peripheral Interface (SPI) is one of the available modes in the Serial Communication Interface (SERCOM).

The SPI uses the SERCOM transmitter and receiver configured as shown in the Block Diagram (see Full-Duplex SPI Host Client Interconnection in the Block Diagram from Related Links). Each side, host and client, depicts a separate SPI containing a Shift register, a transmit buffer and a two-level receive buffer. In addition, the SPI host uses the SERCOM baud-rate generator, while the SPI Client can use the SERCOM address match logic. Labels in capital letters are synchronous to PBx_CLK and accessible by the CPU, while labels in lowercase letters are synchronous to the SCK clock.