ST STM32F423 Reference Manual page 1121

RM0430
CAN receive FIFO mailbox data length control and time stamp register
(CAN_RDTxR) (x = 0..1)
Address offsets: 0x1B4, 0x1C4
Reset value: 0xXXXX XXXX
All RX registers are write protected.
31 30 29
r r r
15 14 13
r r r
Bits 31:16 TIME[15:0]
Bits 15:8 FMI[7:0]
Bits 7:4 Reserved, must be kept at reset value.
Bits 3:0 DLC[3:0]
28 27 26 25
r r r r
12 11 10 9
FMI[7:0]
r r r r
:
Message time stamp
This field contains the 16-bit timer value captured at the SOF detection.
:
Filter match index
This register contains the index of the filter the message stored in the mailbox passed
through. For more details on identifier filtering refer to
page 1096 - Filter Match Index paragraph.
:
Data length code
This field defines the number of data bytes a data frame contains (0 to 8). It is 0 in the case
of a remote frame request.
24 23 22
TIME[15:0]
r r r
8 7 6
Res. Res.
r
RM0430 Rev 8
Controller area network (bxCAN)
21 20 19 18
r r r r
5 4 3 2
Res. Res. DLC[3:0]
r r
Section 32.7.4: Identifier filtering on
17 16
r r
1 0
r r
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