Status register
| PE | Parity error |
| FE | Framing error |
| NF | Noise detected flag |
| ORE | Overrun error |
| IDLE | IDLE line detected |
| RXNE | Read data register not empty |
| TC | Transmission complete |
| TXE | Transmit data register empty |
| LBD | LIN break detection flag |
| CTS | CTS flag |