RM0090 Controller area network (bxCAN)
Doc ID 018909 Rev 4 664/1422
24 Controller area network (bxCAN)
This section applies to the whole STM32F4xx family devices, unless otherwise specified.
24.1 bxCAN 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.
24.2 bxCAN 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
● Scalable filter banks:
– 28 filter banks shared between CAN1 and CAN2
● Identifier list feature
● Configurable FIFO overrun
● Time Stamp on SOF reception
Time-triggered communication option
● Disable automatic retransmission mode
● 16-bit free running timer
● Time Stamp sent in last two data bytes
Management
● Maskable interrupts
● Software-efficient mailbox mapping at a unique address space
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