Controller area network (bxCAN) RM0008
647/1128 DocID13902 Rev 15
Figure 221. CAN network topology
24.3.1 CAN 2.0B active core
The bxCAN module handles the transmission and the reception of CAN messages fully
autonomously. Standard identifiers (11-bit) and extended identifiers (29-bit) are fully
supported by hardware.
24.3.2 Control, status and configuration registers
The application uses these registers to:
• Configure CAN parameters, e.g. baud rate
• Request transmissions
• Handle receptions
• Manage interrupts
• Get diagnostic information
24.3.3 Tx mailboxes
Three transmit mailboxes are provided to the software for setting up messages. The
transmission Scheduler decides which mailbox has to be transmitted first.
24.3.4 Acceptance filters
The bxCAN provides 28 scalable/configurable identifier filter banks for selecting the
incoming messages the software needs and discarding the others. In other devices there
are 14 scalable/configurable identifier filter banks.
Receive FIFO
Two receive FIFOs are used by hardware to store the incoming messages. Three complete
messages can be stored in each FIFO. The FIFOs are managed completely by hardware.
CAN node 1
CAN node 2
CAN node n
CAN
CAN
High Low
CAN
CAN
Rx
Tx
CAN
Transceiver
CAN
Controller
MCU
CAN Bus
Application
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