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When a character is to be transmitted the SPI module signals the DMA via the XEVT signal. The DMA controller then transfers the data from the source buffer into the SPI transmit data register (SPIDAT1). When a character is received, the SPI module signals the DMA via the REVT signal. The DMA controller then reads the data from the SPI receive buffer register (SPIBUF) and transfers it to a destination buffer for ready access.
