Channel A Mode Register
| TXRDY | Channel Transmit Ready Interrupt Enable |
| TXEMPTY | Channel Transmit Empty Interrupt Enable |
| UNRUN | Transmit Underrun Interrupt Enable |
| RXRDY | Channel Receive Ready Interrupt Enable |
| OVRUN | Receive Overrun Interrupt Enable |
| ENDTX | End of Transmission for Channel A Interrupt Enable |
| TXBUFE | Transmit Buffer Empty for Channel A Interrupt Enable |
| ENDRX | End of Reception for Channel A Interrupt Enable |
| RXBUFF | Receive Buffer Full for Channel A Interrupt Enable |
| SIZE | Channel A Data Size |
| CEM | Channel A Endian Mode |
| CEN | Channel A Enable |
| PDCEN | Peripheral Data Controller Channel Enable |