Controller area network (bxCAN) RM0008
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Mailbox data low register (CAN_TDLxR) (x=0..2)
All bits of this register are write protected when the mailbox is not in empty state.
Address offsets: 0x188, 0x198, 0x1A8
Reset value: 0xXX where X is undefined
Bits 31:16 TIME[15:0]: Message Time Stamp
This field contains the 16-bit timer value captured at the SOF transmission.
Bits 15:9 Reserved
Bit 8 TGT: Transmit Global Time
This bit is active only when the hardware is in the Time Trigger Communication mode, TTCM bit of
the CAN_MCR register is set.
0: Time stamp TIME[15:0] is not sent.
1: Time stamp TIME[15:0] value is sent in the last two data bytes of the 8-byte message: TIME[7:0]
in data byte 6 and TIME[15:8] in data byte 7, replacing the data written in CAN_TDHxR[31:16]
register (DATA6[7:0] and DATA7[7:0]). DLC must be programmed as 8 in order these two bytes to
be sent over the CAN bus.
Bits 7:4 Reserved
Bits 3:0 DLC[3:0]: Data Length Code
This field defines the number of data bytes a data frame contains or a remote frame request.
A message can contain from 0 to 8 data bytes, depending on the value in the DLC field.
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
DATA3[7:0] DATA2[7:0]
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw
1514131211109876543210
DATA1[7:0] DATA0[7:0]
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw
Bits 31:24 DATA3[7:0]: Data Byte 3
Data byte 3 of the message.
Bits 23:16 DATA2[7:0]: Data Byte 2
Data byte 2 of the message.
Bits 15:8 DATA1[7:0]: Data Byte 1
Data byte 1 of the message.
Bits 7:0 DATA0[7:0]: Data Byte 0
Data byte 0 of the message.
A message can contain from 0 to 8 data bytes and starts with byte 0.
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