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RM0008
Controller area network (bxCAN)
Bits 6:4 LEC[2:0] : Last error code
This field is set by hardware and holds a code which indicates the error condition of the last
error detected on the CAN bus. If a message has been transferred (reception or
transmission) without error, this field will be cleared to ‘0’.
Code 7 is unused and may be written by the hardware to check for an update
000: No Error
001: Stuff Error
010: Form Error
011: Acknowledgment Error
100: Bit recessive Error
101: Bit dominant Error
110: CRC Error
111: Set by software
Bit 3
Reserved, forced by hardware to 0.
Bit 2 BOFF : Bus-off flag
This bit is set by hardware when it enters the bus-off state. The bus-off state is entered on
TEC overflow, greater than 255, refer to Section 22.7.6 on page 558 .
Bit 1 EPVF : Error passive flag
This bit is set by hardware when the Error Passive limit has been reached (Receive Error
Counter or Transmit Error Counter>127).
Bit 0 EWGF : Error warning flag
This bit is set by hardware when the warning limit has been reached
(Receive Error Counter or Transmit Error Counter ? 96).
CAN bit timing register (CAN_BTR)
Address offset: 0x1C
Reset value: 0x0123 0000
Note:
This register can only be accessed by the software when the CAN hardware is in
initialization mode.
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
SILM
LBKM
SJW[1:0]
Res.
TS2[2:0]
TS1[3:0]
Reserved
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
BRP[9:0]
Reserved
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
Bit 31 SILM : Silent mode (debug)
0: Normal operation
1: Silent Mode
Bit 30 LBKM : Loop back mode (debug)
0: Loop Back Mode disabled
1: Loop Back Mode enabled
Bits 29:26
Reserved, forced by hardware to 0.
Doc ID 13902 Rev 9
571/995
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