USART Control A
| SWRST | Software Reset  |  
| ENABLE | Enable  |  
| MODE | Operating Mode  |  
| RUNSTDBY | Run during Standby  |  
| IBON | Immediate Buffer Overflow Notification  |  
| TXINV | Transmit Data Invert  |  
| RXINV | Receive Data Invert  |  
| SAMPR | Sample  |  
| TXPO | Transmit Data Pinout  |  
| RXPO | Receive Data Pinout  |  
| SAMPA | Sample Adjustment  |  
| FORM | Frame Format  |  
| CMODE | Communication Mode  |  
| CPOL | Clock Polarity  |  
| DORD | Data Order  |