RM0008
Controller area network (bxCAN)
CAN TX mailbox identifier register (CAN_TIxR) (x=0..2)
Address offsets: 0x180, 0x190, 0x1A0
Reset value: undefined (except bit 0, TXRQ = 0)
Note:
1
2
All TX registers are write protected when the mailbox is pending transmission (TMEx reset).
This register also implements the TX request control (bit 0) - reset value 0.
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
STID[10:0]/EXID[28:18]
EXID[17:13]
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
EXID[12:0]
IDE
RTR
TXRQ
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
Bits 31:21 STID[10:0]/EXID[28:18] : Standard identifier or extended identifier
The standard identifier or the MSBs of the extended identifier (depending on the IDE bit
value).
Bit 20:3 EXID[17:0] : Extended identifier
The LSBs of the extended identifier.
Bit 2 IDE : Identifier extension
This bit defines the identifier type of message in the mailbox.
0: Standard identifier.
1: Extended identifier.
Bit 1 RTR : Remote transmission request
0: Data frame
1: Remote frame
Bit 0 TXRQ : Transmit mailbox request
Set by software to request the transmission for the corresponding mailbox.
Cleared by hardware when the mailbox becomes empty.
Doc ID 13902 Rev 9
573/995
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