Infineon 82C900 Istruzioni per l'installazione e il funzionamento

lication Note, V 1.0, Feb. 2004

82C900

Standalone TwinCAN Controller

Microcontrollers

AP29002

Never stop thinking.

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82C900

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Edition 2004-02-01

Published by

Infineon Technologies AG

81726 München, Germany

LEGAL DISCLAIMER

THE INFORMATION GIVEN IN THIS APPLICATION NOTE IS GIVEN AS A HINT FOR THE

IMPLEMENTATION OF THE INFINEONTECHNOLOGIES COMPONENT ONLY AND SHALL NOT BE

REGARDED AS ANY DESCRIPTION ORWARRANTY OF A CERTAIN FUNCTIONALITY, CONDITION OR

QUALITY OF THE INFINEON TECHNOLOGIES COMPONENT. THE RECIPIENT OF THISAPPLICATION

NOTE MUST VERIFY ANY FUNCTIONDESCRIBED HEREIN IN THE REAL APPLICATION. INFINEON

TECHNOLOGIES HEREBY DISCLAIMS ANY AND ALL WARRANTIES AND LIABILITIES OF ANY KIND

(INCLUDING WITHOUT LIMITATION WARRANTIES OF NON-INFRINGEMENT OF INTELLECTUAL

PROPERTY RIGHTS OF ANY THIRD PARTY) WITH RESPECT TO ANY AND ALL INFORMATION GIVEN

IN THIS APPLICATION NOTE.

Information

For further information on technology, delivery terms and conditionsand prices please contact your nearest

Infineon Technologies Office (www.infineon.com).

Warnings

Due to technical requirements components may contain dangerous substances. For information on the types

in question please contact your nearest Infineon Technologies Office.

Infineon Technologies Components may only be used in life-support devicesor systems with the express

written approval of Infineon Technologies, if a failure of such components can reasonably be expected to

cause the failure of that life-support device or system, or to affectthe safety or effectiveness of that device or

system. Life support devicesor systems are intended to be implanted in the human body, or to support

and/or maintain and sustain and/or protect humanlife. If they fail, it is reasonable to assume that the health

of the useror other persons may be endangered.

AP29002

Standalone TwinCAN Controller

Table of Contents

Application Note 3 V 1.0, 2004-02

Table of Contents Page

1 Product Overview.......................................................................................... 2

2 CAN protocol overview.................................................................................. 2

3 Using special features of the 82C900 ........................................................... 2

3.1 Using the 82C900 with SSC interface ........................................................... 2

3.2 Using the parallel interface of the 82C900 .................................................... 2

3.3 Hardware Gateway functionality.................................................................... 2

3.4 Normal Gateway Mode.................................................................................. 2

3.5 Shared Gateway ........................................................................................... 2

3.6 Stand Alone mode......................................................................................... 2

3.7 SPI Master Mode .......................................................................................... 2

3.8 Configuration via CAN-Bus ........................................................................... 2

3.9 Using the parallel port as general purpose I/O.............................................. 2

3.10 The FIFO-capability of the 82C900 ............................................................... 2

3.11 Using the FIFO-buffering in a gateway application........................................ 2

3.12 Power Saving Modes .................................................................................... 2

AP29002

Standalone TwinCAN Controller

Product Overview

Application Note 4 V 1.0, 2004-02

1Product Overview

The TwinCAN module in the 82C900 permits the connection and autonomous handling

of two independent CAN buses. It supports the maximum CAN baud rate of 1M baud

and complies with CAN protocol version 2.0B (active).

The full-CAN module has 32 message objects, which can be independently assigned

to one of the two buses. The scalable FIFO mechanism for reception and transmission

greatly improves the real-time behavior of the system. The device provides built-in

automatic gateway functionality for data exchange between both CAN buses,

minimizing the CPU's message handling load. The gateway feature can also be used

for automatic reply to received messages.

The powerful interrupt structure permits application-specific interrupt generation. The

enhanced acceptance filtering dedicates one acceptance mask to each message

object. In addition, a 16-bit frame count/time-stamp is implemented for each message

object. The 82C900's analyzing mode, during which no dominant bits are sent, makes

it ideal for diagnostic applications.

Figure 1 82C900 Architectural Overview

AP29002

Standalone TwinCAN Controller

Product Overview

Application Note 5 V 1.0, 2004-02

The Infineon 82C900 comes with many useful features, such as:

•Handles two independent CAN buses autonomously

•32 message objects can be independently assigned to one of the two buses

•Complies with CAN protocol version 2.0B (active)

•Baud rate up to 1Mbaud

•Scalable FIFO mechanism

•Built-in automatic gateway functionality

•Remote frame monitoring

•One acceptance filtering mask per message object

•16 bit frame count/time-stamp per message object

•Analyzing mode

•Parallel and serial interface

•Can be configured via external serial EEPROM

•Clock output pin

•Power saving features

•28-pin P-DSO package

•Temperature range -40° to +125° C

The Standalone TwinCAN device provides two interface channels for communication

with a host microcontroller: a multiplexed address/data bus and a synchronous serial

channel (SSC). The SSC may also be used to read out the initial TwinCAN register

configuration from a serial EEPROM without requiring a host microcontroller. A Sleep

Mode and a Power-Down Mode can be activated in order to minimize power

consumption. The device's clock can be controlled by CAN messages.

AP29002

Standalone TwinCAN Controller

CAN protocol overview

Application Note 6 V 1.0, 2004-02

2CAN protocol overview

CAN is an asynchronous serial bus system with one logical bus line. A CAN bus

consists of two or more nodes. The number of nodes on the bus may be changed

dynamically without disturbing the communication of other nodes. This allows easy

connection and disconnection of bus nodes (e.g. node for software upgrade, bus

monitoring…).

The bus logic corresponds to a “wired-AND” mechanism, recessive bits are overwritten

by dominants bits. As long as no bus node is sending a dominant bit, the bus line is in

the recessive state, but a dominant bit from any node generates the dominant Bus

State.

The maximum bus speed is 1Mbaud, which can be achieved with a bus length of up to

40m. At least 30 nodes may be connected without additional equipment.

Figure 2 Structure of a Standard data Frame generated by a CAN node

AP29002

Standalone TwinCAN Controller

CAN protocol overview

Application Note 7 V 1.0, 2004-02

In this kind of frame, the identifier field has a length up to 11 bits giving 2048 message

identifiers. But “extended CAN” specifications allow a 29 bits identifier field giving 536

Million messages identifiers. In this application note, only “standard CAN” will be used

but C167CR and CS also support “extended CAN” specifications.

For bus arbitration, Carrier Sense Multiple Access / Collision Detection with Non-

Destructive Arbitration is used. It means that if a node wants to transmit a message, it

checks first that the bus is in the idle state (“Carrier Sense”). If this is the case the node

becomes the bus master and sends its message. If many nodes start their

transmission at the same time (“Multiple Access”) collision is avoided by bit wise

arbitration (Collision Detection with Non-Dest’ructive Arbitration).

Each node sends the bits of its message identifier and monitors the bus level. A node

which sends a recessive identifier bit but reads back a dominant one loses bus

arbitration and switches to receive mode.

The CAN protocol allows a high data integrity with several means for error checking

and can detect:

•Cyclic Redundancy Check (CRC) Errors

•Acknowledge Errors

•Form Errors

•Bit Errors

•Stuff Errors

AP29002

Standalone TwinCAN Controller

Using special features of the 82C900

Application Note 8 V 1.0, 2004-02

3Using special features of the 82C900

The following chapter contains descriptions and example applications to all the

important features of the 82C900. The examples are all developed using the 82C900

Starter Kit, Dave 2.1 and the Keil-compiler. The examples that require a host interface

use the C167CR Starter Kit. The clock frequency of the crystal on the 82C900 Starter

Kit is 24 MHz.

3.1 Using the 82C900 with SSC interface

The SSC interface provides an economical way to connect the 82C900 to a

microcontroller. The SSC interface is developed by Infineon and is 100% SPI

compatible. Basically there are only 5 port pins necessary for communication via SSC

(plus one for each interrupt you want to use). The default baud rate of the SSC

interface on the 82C900 is 100 KBaud. But it can work with a speed up to 6.25 MBaud

in slave- and 12.5 MBaud in master mode.

Figure 3 Important connections for the SSC-Data transfer. For RDY and SLS,

any available Port of the microcontroller can be used.

82C900

CTRL3

CTRL2

CTRL1

CTRL0

24MHz

22pF 22pF

MODE0

MODE1

RDY

µC

PX.X

PX.Y

SCLK

MTSR

MRST

100K

RDY

/SLS

SCLK

MTSR

MRST

AP29002

Standalone TwinCAN Controller

Using special features of the 82C900

Application Note 9 V 1.0, 2004-02

An example using the SSC Slave mode of the 82C900 was implemented using the

82C900 evaluation board and an Infineon C167CR as the host microcontroller. The

82C900 evaluation board was connected directly to the Phytec KitCON167 evaluation

board for the C167CR.

Note: Please note that this example can also be implemented on many other Infineon

Microcontrollers, such as the C161PI. If you want to use the Phytec C161O

KitCon board, the board needs to be connected with wires because P3.4 of the

KitCon board is used for other functions. So another port pin has to be used for

the /RDY signal. But if wires are used noise can be a problem, if the wires are to

long or the connectors are not good enough.

The jumper configurations on the 82C900 starterkit are shown in Table 1.

Table 1 Jumper settings for SSC-Slave-Mode

JP10 1-2 connected: SLS on CTRL0

JP32 Open (MODE0 = ‘1’)

JP33 Close (MODE1 = ‘0’)

JP38 All open

JP39 3-7 closed,

1-2 depending which interrupts are used

8 open

JP40 All open

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