Status register
| PERR | Parity error |
| FERR | Framing error |
| NERR | Noise error |
| ROERR | Receiver overflow error |
| IDLEF | IDLE flag |
| RDBF | Receive data buffer full |
| TDC | Transmit data complete |
| TDBE | Transmit data buffer empty |
| BFF | Break frame flag |
| CTSCF | CTS change flag |
| RTODF | Receiver time out detection flag |
| OCCUPY | Receiver occupied flag |
| CMDF | Character match detect flag |
| LPWUF | Low power wakeup flag |
| TXON | Transmitter enabled flag |
| RXON | Receiver enabled flag |