Configuration register 0
| PARITY | This register is used to configure the parity check mode. |
| PARITY_EN | Set this bit to enable uart parity check. |
| BIT_NUM | This register is used to set the length of data. |
| STOP_BIT_NUM | This register is used to set the length of stop bit. |
| TXD_BRK | Set this bit to enbale transmitter to send NULL when the process of sending data is done. |
| LOOPBACK | Set this bit to enable uart loopback test mode. |
| TX_FLOW_EN | Set this bit to enable flow control function for transmitter. |
| RXD_INV | Set this bit to inverse the level value of uart rxd signal. |
| TXD_INV | Set this bit to inverse the level value of uart txd signal. |
| DIS_RX_DAT_OVF | Disable UART Rx data overflow detect. |
| ERR_WR_MASK | 1’h1: Receiver stops storing data into FIFO when data is wrong. 1’h0: Receiver stores the data even if the received data is wrong. |
| MEM_CLK_EN | UART memory clock gate enable signal. |
| SW_RTS | This register is used to configure the software rts signal which is used in software flow control. |
| RXFIFO_RST | Set this bit to reset the uart receive-FIFO. |
| TXFIFO_RST | Set this bit to reset the uart transmit-FIFO. |