ST STM32F40 Series Reference Manual page 697

Controller area network (bxCAN)
CAN 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: 0xXXXX XXXX
31 30 29
rw rw rw
15 14 13
rw rw rw
Bits 31:24 DATA3[7:0]
Bits 23:16 DATA2[7:0]
Bits 15:8 DATA1[7:0]
Bits 7:0 DATA0[7:0]
CAN mailbox data high register (CAN_TDHxR) (x=0..2)
All bits of this register are write protected when the mailbox is not in empty state.
Address offsets: 0x18C, 0x19C, 0x1AC
Reset value: 0xXXXX XXXX
31 30 29
rw rw rw
15 14 13
rw rw rw
697/1422
28 27 26 25
DATA3[7:0]
rw rw rw rw
12 11 10 9
DATA1[7:0]
rw rw rw rw
:
Data byte 3
Data byte 3 of the message.
:
Data byte 2
Data byte 2 of the message.
:
Data byte 1
Data byte 1 of the message.
:
Data byte 0
Data byte 0 of the message.
A message can contain from 0 to 8 data bytes and starts with byte 0.
28 27 26 25
DATA7[7:0]
rw rw rw rw
12 11 10 9
DATA5[7:0]
rw rw rw rw
Doc ID 018909 Rev 4
24 23 22 21
rw rw rw rw
8 7 6 5
rw rw rw rw
24 23 22 21
rw rw rw rw
8 7 6 5
rw rw rw rw
20 19 18 17
DATA2[7:0]
rw rw rw rw
4 3 2 1
DATA0[7:0]
rw rw rw rw
20 19 18 17
DATA6[7:0]
rw rw rw rw
4 3 2 1
DATA4[7:0]
rw rw rw rw
RM0090
16
rw
0
rw
16
rw
0
rw