Controller area network (bxCAN) UM0306
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● 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).
– Wake-up condition, SOF monitored on the CAN Rx signal.
– Entry into SLEEP mode.
14.7 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 124: Transmit mailbox states.
The filters 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.
14.8 CAN register description
Refer to Section 1.1 on page 23 for a list of abbreviations used in register descriptions.
14.8.1 Control and status registers
CAN master control register (CAN_MCR)
Address Offset: 00h
Reset value: 00010002h
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Reserved
1514131211109876543210
Reserved TTCM ABOM AWUM NART RFLM TXFP SLEEP INRQ
rw rw rw rw rw rw rw rw
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Reserved DBF
rw
1514131211109876543210
RE
SET
Reserved TTCM ABOM AWUM NART RFLM TXFP SLEEP INRQ
rs rw rw rw rw rw rw rw rw
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