FIFO configuration register.
| RXFIFO_WM_THRHD | The water mark threshold of rx FIFO in nonfifo access mode. When reg_reg_fifo_prt_en is 1 and rx FIFO counter is bigger than reg_rxfifo_wm_thrhd[4:0], reg_rxfifo_wm_int_raw bit will be valid. |
| TXFIFO_WM_THRHD | The water mark threshold of tx FIFO in nonfifo access mode. When reg_reg_fifo_prt_en is 1 and tx FIFO counter is smaller than reg_txfifo_wm_thrhd[4:0], reg_txfifo_wm_int_raw bit will be valid. |
| NONFIFO_EN | Set this bit to enable APB nonfifo access. |
| FIFO_ADDR_CFG_EN | When this bit is set to 1, the byte received after the I2C address byte represents the offset address in the I2C Slave RAM. |
| RX_FIFO_RST | Set this bit to reset rx-fifo. |
| TX_FIFO_RST | Set this bit to reset tx-fifo. |
| FIFO_PRT_EN | The control enable bit of FIFO pointer in non-fifo access mode. This bit controls the valid bits and the interrupts of tx/rx_fifo overflow, underflow, full and empty. |