Interrupt Enable Register
| RXRDY | RXRDY Interrupt Enable |
| TXRDY | TXRDY Interrupt Enable |
| RXBRK | Receiver Break Interrupt Enable |
| ENDRX | End of Receive Buffer Interrupt Enable (available in all USART modes of operation) |
| ENDTX | End of Transmit Buffer Interrupt Enable (available in all USART modes of operation) |
| OVRE | Overrun Error Interrupt Enable |
| FRAME | Framing Error Interrupt Enable |
| PARE | Parity Error Interrupt Enable |
| TIMEOUT | Time-out Interrupt Enable |
| TXEMPTY | TXEMPTY Interrupt Enable |
| ITER | Max number of Repetitions Reached Interrupt Enable |
| TXBUFE | Transmit Buffer Empty Interrupt Enable (available in all USART modes of operation) |
| RXBUFF | Receive Buffer Full Interrupt Enable (available in all USART modes of operation) |
| NACK | Non Acknowledge Interrupt Enable |
| RIIC | Ring Indicator Input Change Enable |
| DSRIC | Data Set Ready Input Change Enable |
| DCDIC | Data Carrier Detect Input Change Interrupt Enable |
| CTSIC | Clear to Send Input Change Interrupt Enable |
| MANE | Manchester Error Interrupt Enable |