Status Register
| CMDRDY | Command Ready |
| RXRDY | Receiver Ready |
| TXRDY | Transmit Ready |
| BLKE | Data Block Ended |
| DTIP | Data Transfer in Progress |
| NOTBUSY | MCI Not Busy |
| ENDRX | End of RX Buffer |
| ENDTX | End of TX Buffer |
| RXBUFF | RX Buffer Full |
| TXBUFE | TX Buffer Empty |
| RINDE | Response Index Error |
| RDIRE | Response Direction Error |
| RCRCE | Response CRC Error |
| RENDE | Response End Bit Error |
| RTOE | Response Time-out Error |
| DCRCE | Data CRC Error |
| DTOE | Data Time-out Error |
| OVRE | Overrun |
| UNRE | Underrun |