Controller area network (bxCAN) RM0090
679/1422 Doc ID 018909 Rev 4
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 234. CAN error state diagram
Table 100. Transmit mailbox mapping
Offset to transmit mailbox base address Register name
0CAN_TIxR
4 CAN_TDTxR
8CAN_TDLxR
12 CAN_TDHxR
Table 101. Receive mailbox mapping
Offset to receive mailbox base
address (bytes)
Register name
0CAN_RIxR
4 CAN_RDTxR
8CAN_RDLxR
12 CAN_RDHxR
ERROR PASSIVE
When TEC or REC > 127
When TEC and REC < 128,
ERROR ACTIVE
BUS OFF
When TEC > 255When 128 * 11 recessive bits occur:
ai15903
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