ST STM32F412 Reference Manual page 943

RM0402
31 30 29
Res. Res. Res.
15 14 13
RESET Res. Res.
rs
Bits 31:17 Reserved, must be kept at reset value.
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.
Bits 14:8 Reserved, must be kept at reset value.
Bit 7 TTCM: Time triggered communication mode
0: Time Triggered Communication mode disabled.
1: Time Triggered Communication mode enabled
Note: For more information on Time Triggered Communication mode, refer to
Bit 6 ABOM: Automatic bus-off management
This bit controls the behavior of the CAN hardware on leaving the Bus-Off state.
0: The Bus-Off state is left on software request, once 128 occurrences of 11 recessive bits
have been monitored and the software has first set and cleared the INRQ bit of the
CAN_MCR register.
1: The Bus-Off state is left automatically by hardware once 128 occurrences of 11 recessive
bits have been monitored.
For detailed information on the Bus-Off state refer to
Bit 5 AWUM
This bit controls the behavior of the CAN hardware on message reception during Sleep
mode.
0: The Sleep mode is left on software request by clearing the SLEEP bit of the CAN_MCR
register.
1: The Sleep mode is left automatically by hardware on CAN message detection.
The SLEEP bit of the CAN_MCR register and the SLAK bit of the CAN_MSR register are
cleared by hardware.
Bit 4 NART
0: The CAN hardware automatically retransmits the message until it has been successfully
transmitted according to the CAN standard.
1: A message is transmitted only once, independently of the transmission result (successful,
error or arbitration lost).
28 27 26 25
Res. Res. Res. Res.
12 11 10 9
Res. Res. Res. Res.
Time triggered communication
:
Automatic wakeup mode
:
No automatic retransmission
24 23 22
Res. Res. Res.
8 7 6
Res. TTCM ABOM AWUM
rw rw
mode.
RM0402 Rev 6
Controller area network (bxCAN)
21 20 19 18
Res. Res. Res. Res.
5 4 3 2
NART RFLM TXFP
rw rw rw rw
Section 28.7.6: Error management.
17 16
Res. DBF
rw
1 0
SLEEP INRQ
rw rw
Section 28.7.2:
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