Serial Control Register
| TXE | Data transmission enable bit |
| RXE | Data reception enable bit |
| TBIE | Transmit bus idle interrupt enable bit |
| TIE | Transmit interrupt enable bit |
| RIE | Received interrupt enable bit |
| LBR | LIN Break Field setting bit (valid in master mode only) |
| MS | Master/Slave function select bit |
| UPCL | Programmable clear bit |