ST72561AR7-Auto datasheet(216/324 Pages) STMICROELECTRONICS

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beCAN controller (beCAN)

ST72561-Auto

216/324

Doc ID 12370 Rev 8

beCAN controller (beCAN)

The beCAN controller (Basic Enhanced CAN), interfaces the CAN network and supports the

CAN protocol version 2.0A and B. It has been designed to manage high number of incoming

messages efficiently with a minimum CPU load. It also meets the priority requirements for

transmit messages.

17.1

Main features

●

Supports CAN protocol version 2.0 A, B Active

●

Bit rates up to 1Mbit/s

Transmission

●

2 transmit mailboxes

●

Configurable transmit priority

Reception

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1 receive FIFO with three stages

●

6 scalable filter banks

●

Identifier list feature

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Configurable FIFO overrun

Management

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Maskable interrupts

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Software-efficient mailbox mapping at a unique address space

17.2

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

application messages, network management and diagnostic messages have been

introduced.

●

An enhanced filtering mechanism is required to handle each type of message.

Furthermore, application tasks require more CPU time, therefore real-time constraints

caused by message reception have to be reduced.

●

A receive FIFO scheme allows the CPU to be dedicated to application tasks for a long

time period without losing messages.

The standard HLP (Higher Layer Protocol) based on standard CAN drivers requires an

efficient interface to the CAN controller.

●

All mailboxes and registers are organized in 16-byte pages mapped at the same

address and selected via a page select register.

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