Controller area network (bxCAN) RM0351
1590/1830 DocID024597 Rev 5
Receive mailbox
When a message has been received, it is available to the software in the FIFO output
mailbox. Once the software has handled the message (e.g. read it) the software must
release the FIFO output mailbox by means of the RFOM bit in the CAN_RFR register to
make the next incoming message available. The filter match index is stored in the MFMI
field of the CAN_RDTxR register. The 16-bit time stamp value is stored in the TIME[15:0]
field of CAN_RDTxR.
Figure 512. CAN error state diagram
Table 297. Transmit mailbox mapping
Offset to transmit mailbox base address Register name
0CAN_TIxR
4 CAN_TDTxR
8CAN_TDLxR
12 CAN_TDHxR
Table 298. Receive mailbox mapping
Offset to receive mailbox base
address (bytes)
Register name
0CAN_RIxR
4 CAN_RDTxR
8 CAN_RDLxR
12 CAN_RDHxR
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