STR720 datasheet(202/401 Pages) STMICROELECTRONICS

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STR720 - CONTROLLER AREA NETWORK (CAN)

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18 CONTROLLER AREA NETWORK (CAN)

18.1 Introduction

The CAN Peripheral consists of the CAN Core, Message RAM, Message Handler, Control

Registers and Module Interface (Refer to Figure 29).

The CAN Core performs communication according to the CAN protocol version 2.0 part A and

B. The bit rate can be programmed to values up to 1MBit/s. For the connection to the physical

layer, additional transceiver hardware is required.

For communication on a CAN network, individual Message Objects are configured. The

Message Objects and Identifier Masks for acceptance filtering of received messages are

stored in the Message RAM.

All functions concerning the handling of messages are implemented in the Message Handler.

These functions include acceptance filtering, the transfer of messages between the CAN Core

and the Message RAM, and the handling of transmission requests as well as the generation

of the module interrupt.

The register set of the CAN Peripheral can be accessed directly by the CPU through the

module interface. These registers are used to control/configure the CAN Core and the

Message Handler and to access the Message RAM.

18.2 Main Features

•

Supports CAN protocol version 2.0 part A and B.

•

Bit rates up to 1 MBit/s.

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32 Message Objects.

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Each Message Object has its own identifier mask.

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Programmable FIFO mode (concatenation of Message Objects).

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Maskable interrupt.

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Disabled Automatic Re-transmission mode for Time Triggered CAN applications.

•

Programmable loop-back mode for self-test operation.

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8-bit non-multiplex Motorola HC08 compatible module interface.

•

Two 16-bit module interfaces to the AMBA APB bus.

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