Main control register
| FZEN | Freeze mode enable |
| DZEN | Doze mode enable |
| MMSSR | Multiple message sending sequence rule |
| MDRSEL | Message discarding rule select when overflow |
| PRSFEN | Prohibit retransmission when sending fails enable |
| AEDEN | Automatic exit doze mode enable |
| AEBOEN | Automatic exit bus-off enable |
| TTCEN | Time triggered communication mode enable |
| SPRST | Software partial reset |
| PTD | Prohibit transmission when debug |