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Controller area network (bxCAN)
RM0008
CAN mailbox data length control and time stamp register (CAN_TDTxR)
(x=0..2)
All bits of this register are write protected when the mailbox is not in empty state.
Address offsets: 0x184, 0x194, 0x1A4
Reset value: undefined
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
TIME[15:0]
rw
15
rw
14
rw
13
rw
12
rw
11
rw
10
rw
9
rw
8
rw
7
rw
6
rw
5
rw
4
rw
3
rw
2
rw
1
rw
0
Reserved
TGT
Reserved
DLC[3:0]
rw
rw
rw
rw
rw
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 7 and TIME[15:8] in data byte 6, 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.
574/995
Doc ID 13902 Rev 9
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