Interrupt Enable Register
| TXRDY | Transmit Ready Interrupt Enable |
| TXEMPTY | Transmit Empty Interrupt Enable |
| ENDTX | End of Transmission Interrupt Enable |
| TXBUFE | |
| RXRDY | Receive Ready Interrupt Enable |
| OVRUN | Receive Overrun Interrupt Enable |
| ENDRX | End of Reception Interrupt Enable |
| RXBUFF | |
| CP0 | Compare 0 Interrupt Enable |
| CP1 | Compare 1 Interrupt Enable |
| TXSYN | Tx Sync Interrupt Enable |
| RXSYN | Rx Sync Interrupt Enable |