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Support for 3-, 4- or 6-pin SPI interface – 3-pin mode uses spi_dout as inout/spi_din not used – 4-pin mode for dual read uses spi_dout as in/spi_din as in – 6-pin mode uses spi_dout as in/spi_din as in/spi_qdin0 as in/spi_qdin1 as in
