Interrupt Mask Register
| MB0 | Mailbox 0 Interrupt Mask |
| MB1 | Mailbox 1 Interrupt Mask |
| MB2 | Mailbox 2 Interrupt Mask |
| MB3 | Mailbox 3 Interrupt Mask |
| MB4 | Mailbox 4 Interrupt Mask |
| MB5 | Mailbox 5 Interrupt Mask |
| MB6 | Mailbox 6 Interrupt Mask |
| MB7 | Mailbox 7 Interrupt Mask |
| ERRA | Error Active Mode Interrupt Mask |
| WARN | Warning Limit Interrupt Mask |
| ERRP | Error Passive Mode Interrupt Mask |
| BOFF | Bus Off Mode Interrupt Mask |
| SLEEP | Sleep Interrupt Mask |
| WAKEUP | Wakeup Interrupt Mask |
| TOVF | Timer Overflow Interrupt Mask |
| TSTP | Timestamp Interrupt Mask |
| CERR | CRC Error Interrupt Mask |
| SERR | Stuffing Error Interrupt Mask |
| AERR | Acknowledgment Error Interrupt Mask |
| FERR | Form Error Interrupt Mask |
| BERR | Bit Error Interrupt Mask |