ST72561 datasheet(172/262 Pages) STMICROELECTRONICS

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ST72561

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10.9 beCAN CONTROLLER (beCAN)

The beCAN controller (Basic Enhanced CAN), in-

terfaces the CAN network and supports the CAN

protocol version 2.0A and B. It has been designed

to manage high number of incoming messages ef-

ficiently with a minimum CPU load. It also meets

the priority requirements for transmit messages.

10.9.1 Main Features

Supports CAN protocol version 2.0 A, B Active

Bit rates up to 1Mbit/s

Transmission

Two transmit mailboxes

Configurable transmit priority

Reception

One receive FIFO with three stages

Six scalable filter banks

Identifier list feature

Configurable FIFO overrun

Management

Maskable interrupts

Software-efficient mailbox mapping at a unique

address space

10.9.2 General Description

In today’s CAN applications, the number of nodes

in a network is increasing and often several net-

works are linked together via gateways. Typically

the number of messages in the system (and thus

to be handled by each node) has significantly in-

creased. 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 pe-

riod without losing messages.

The standard HLP (Higher Layer Protocol) based

on standard CAN drivers requires an efficient in-

terface to the CAN controller.

– All mailboxes and registers are organized in 16-

byte pages mapped at the same address and se-

lected via a page select register.

Figure 94. CAN Network Topology

CAN

High

Low

CAN

Transceiver

CAN

Controller

ST9 MCU

CAN Bus

Application

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