Command Register
| TX_REQ | Set the bit to 1 to allow the driving nodes start transmission. |
| ABORT_TX | Set the bit to 1 to cancel a pending transmission request. |
| RELEASE_BUF | Set the bit to 1 to release the RX buffer. |
| CLR_OVERRUN | Set the bit to 1 to clear the data overrun status bit. |
| SELF_RX_REQ | Self reception request command. Set the bit to 1 to allow a message be transmitted and received simultaneously. |