Interrupt Enable Register
| RXRDY | RXRDY Interrupt Enable |
| TXRDY | TXRDY Interrupt Enable |
| ENDRX | End of Receive Buffer Interrupt Enable |
| ENDTX | End of Transmit Buffer Interrupt Enable |
| OVRE | Overrun Error Interrupt Enable |
| TXEMPTY | TXEMPTY Interrupt Enable |
| UNRE | SPI Underrun Error Interrupt Enable |
| TXBUFE | Transmit Buffer Empty Interrupt Enable |
| RXBUFF | Receive Buffer Full Interrupt Enable |