Controller Area Network (Bxcan); Introduction; Main Features - ST STM32F101 Series Reference Manual

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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
Note: The USB and CAN share a dedicated 512-byte SRAM memory for data transmission and
reception, and so they cannot be used concurrently (the shared SRAM is accessed through
CAN and USB exclusively). The USB and CAN can be used in the same application but not
at the same time.
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