EID=0, SID=0, RTR=0, IDE=0
Mailbox Register
| EID | Extended ID 0 (0): Corresponding EID[17:0] bits are 0 1 (1): Corresponding EID[17:0] bits are 1 |
| SID | Standard ID 0 (0): Corresponding SID[10:0] bits are 0 1 (1): Corresponding SID[10:0] bits are 1 |
| Reserved | This bit is read as 0. The write value should be 0. |
| RTR | Remote Transmission Request 0 (0): Data frame 1 (1): Remote frame |
| IDE | ID Extension 0 (0): Standard ID 1 (1): Extended ID |