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ST ST32M103 Series - Page 317

ST ST32M103 Series
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UM0306 Controller area network (bxCAN)
317/519
Rx FIFO mailbox identifier register (CAN_RIxR) (x=0..1)
Address Offsets: 1B0h, 1C0h
Reset Value: xxh
Note: All RX registers are write protected.
Bits 15:8
DATA5[7:0]: Data Byte 5
Data byte 5 of the message.
Bits 7:0
DATA4[7:0]: Data Byte 4
Data byte 4 of the message.
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
STID[10:0] EXID[17:13]
rrrrrrrrrrrrrrrr
1514131211109876543210
EXID[12:0] IDE RTR Res.
rrrrrrrrrrrrrrr
Bits 31:21
STID[10:0]: Standard Identifier
The standard part of the identifier.
Bits 20:3
EXID[17:0]: Extended Identifier
The extended part of the identifier.
Bit 2
IDE: Extended Identifier
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 Reserved
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