Controller area network (bxCAN) UM0306
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14 Controller area network (bxCAN)
14.1 Introduction
The Basic Extended CAN peripheral, named bxCAN, interfaces the CAN network. It
supports the CAN protocols version 2.0A and B. It has been designed to manage a high
number of incoming messages efficiently with a minimum CPU load. It also meets the
priority requirements for transmit messages.
For safety-critical applications, the CAN controller provides all hardware functions for
supporting the CAN Time Triggered Communication option.
14.2 Main features
● Supports CAN protocol version 2.0 A, B Active
● Bit rates up to 1 Mbit/s
● Supports the Time Triggered Communication option
Transmission
● Three transmit mailboxes
● Configurable transmit priority
● Time Stamp on SOF transmission
Reception
● Two receive FIFOs with three stages
● 14 scalable filter banks/CAN cell - shared between CAN cells
● Identifier list feature
● Configurable FIFO overrun
● Time Stamp on SOF reception
Time Triggered Communication Option
● Disable automatic retransmission mode
● 16-bit free running timer
● Configurable timer resolution
● Time Stamp sent in last two data bytes
Management
● Maskable interrupts
● Software-efficient mailbox mapping at a unique address space
14.3 General description
In today’s CAN applications, the number of nodes in a network is increasing and often
several networks are linked together via gateways. Typically the number of messages in the
system (and thus to be handled by each node) has significantly increased. In addition to the
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