Controller area network (bxCAN) RM0008
645/1128 DocID13902 Rev 15
24 Controller area network (bxCAN)
Low-density devices are STM32F101xx, STM32F102xx and STM32F103xx
microcontrollers where the Flash memory density ranges between 16 and 32 Kbytes.
Medium-density devices are STM32F101xx, STM32F102xx and STM32F103xx
microcontrollers where the Flash memory density ranges between 64 and 128 Kbytes.
High-density devices are STM32F101xx and STM32F103xx microcontrollers where the
Flash memory density ranges between 256 and 512 Kbytes.
XL-density devices are STM32F101xx and STM32F103xx microcontrollers where the
Flash memory density ranges between 768 Kbytes and 1 Mbyte.
Connectivity line devices are STM32F105xx and STM32F107xx microcontrollers.
This section applies to the connectivity line and STM32F103xx performance line only.
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 in connectivity line devices
– 14 filter banks in other STM32F10xxx devices
• Identifier list feature
• Configurable FIFO overrun
• Time Stamp on SOF reception
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