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Controller area network (bxCAN)
RM0008
●
The error and status change interrupt can be generated by the following events:
–
–
–
Error condition, for more details on error conditions please refer to the CAN Error
Status register (CAN_ESR).
Wakeup condition, SOF monitored on the CAN Rx signal.
Entry into Sleep mode.
22.9
22.9.1
22.9.2
CAN registers
Register access protection
Erroneous access to certain configuration registers can cause the hardware to temporarily
disturb the whole CAN network. Therefore the CAN_BTR register can be modified by
software only while the CAN hardware is in initialization mode.
Although the transmission of incorrect data will not cause problems at the CAN network
level, it can severely disturb the application. A transmit mailbox can be only modified by
software while it is in empty state, refer to Figure 198: Transmit mailbox states .
The filter values can be modified either deactivating the associated filter banks or by setting
the FINIT bit. Moreover, the modification of the filter configuration (scale, mode and FIFO
assignment) in CAN_FMxR, CAN_FSxR and CAN_FFAR registers can only be done when
the filter initialization mode is set (FINIT=1) in the CAN_FMR register.
CAN control and status registers
Refer to Section 1.1 on page 37 for a list of abbreviations used in register descriptions.
CAN master control register (CAN_MCR)
Address offset: 0x00
Reset value: 0x0001 0002
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
DBF
Reserved
rw
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
RESET
TTCM
ABOM
AWUM
NART
RFLM
TXFP
SLEEP
INRQ
Reserved
rs
rw
rw
rw
rw
rw
rw
rw
rw
Bits 31:17
Reserved, forced by hardware to 0.
Bit 16 DBF: Debug freeze
0: CAN working during debug
1: CAN reception/transmission frozen during debug. Reception FIFOs can still be
accessed/controlled normally.
Bit 15 RESET: bxCAN software master reset
0: Normal operation.
1: Force a master reset of the bxCAN -> Sleep mode activated after reset (FMP bits and
CAN_MCR register are initialized to the reset values). This bit is automatically reset to 0.
562/995
Doc ID 13902 Rev 9
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