SPIXFC_FIFO SPI XiP Master Controller FIFO. 0x400BC000 0 0x1000 registers TX_8 SPI TX FIFO 8-Bit Write 0x00 8 uint8_t TX_16 SPI TX FIFO 16-Bit Write TX_8 0x00 16 uint16_t TX_32 SPI TX FIFO 32-Bit Write TX_8 0x00 32 uint32_t RX_8 SPI RX FIFO 8-Bit Access 0x04 8 uint8_t RX_16 SPI RX FIFO 16-Bit Access RX_8 0x04 16 uint16_t RX_32 SPI RX FIFO 32-Bit Access RX_8 0x04 32 uint32_t