Interrupt Disable Register
| RDRF | Receive Data Register Full Interrupt Disable |
| TDRE | SPI Transmit Data Register Empty Interrupt Disable |
| MODF | Mode Fault Error Interrupt Disable |
| OVRES | Overrun Error Interrupt Disable |
| ENDRX | End of Receive Buffer Interrupt Disable |
| ENDTX | End of Transmit Buffer Interrupt Disable |
| RXBUFF | Receive Buffer Full Interrupt Disable |
| TXBUFE | Transmit Buffer Empty Interrupt Disable |
| NSSR | NSS Rising Interrupt Disable |
| TXEMPTY | Transmission Registers Empty Disable |