MICROCONTROLLER BASED DIGITAL CODE LOCK S.BHAGEERATH REDDY 07N71A0410

CAN PROTOCOL IMPLEMENTATION FOR DATACOMMUNICATION

B.KISHORE KUMAR 07N71A0428 PROJECT OBJECTIVEDesign and develop microcontroller based communication system

Build a high secure way of data communication.

CHARACTERISTICS OF CANROBERT BOSCHMainly used for automotive & automobile applicationsMulti master protocolMessage oriented transmissionHighly securable protocolReduces wiring costHighly reliableDifferent range of bit rates..

INTRODUCTION OF THE PROJECT :Communication as the primary aspectSecurity of the level of communicationCan be utilized in various different types of communications.An access control system that allows only authorized persons to access the received data.

BLOCK DIAGRAM

CAN TransceiverMCP2551CAN CONTROLLERAT89S52LCDCAN TransceiverMCP2551CAN CONTROLLERAT89S52PCCANHCANLCAN PROTOCOL COMMUNICATION

MICROCONTROLLER Compatible with MCS-51 Products8K Bytes of In-System Reprogrammable Flash MemoryFully Static Operation: 0 Hz to 33 MHzThree-level Program Memory Lock256 x 8-bit Internal RAM32 Programmable I/O LinesThree 16-bit Timer/CountersEight Interrupt SourcesProgrammable Serial ChannelLow-power Idle and Power-down Modes4.0V to 5.5V Operating Range

AT89S52 PIN CONFIGURATION

BLOCK DIAGRAM OF REGULATED POWER SUPPLY

MAX 232FEATURES:Operates With Single 5-V Power SupplyTwo Drivers and Two Receivers30-V Input LevelsLow Supply Current . . . 8 mA Typical

RS 232 Devices which use serial cables for their communication are split into two categories. These are DCE and DTE. 1. A "Space" (logic 0) will be between +3 and +25 Volts. 2. A "Mark" (Logic 1) will be between -3 and -25 Volts. 3. The region between +3 and -3 volts is undefined.

MAX 232 interfacing RS 232 AND 89S52

MCP 2515Features18-pin package Simple SPI interface to any MCU One-shot mode ensures message transmission is attempted only once Data byte filtering Start-of-Frame (SOF) output Low-power CMOS Technology.

PIN DIAGRAM OF MCP2515

MCP 2551FeaturesSlope control input Supports 1 Mb/s operation Implements ISO-11898 standard physical layer requirements Suitable for 12V and 24V systems Externally-controlled slope for reduced RFI emissions Permanent dominant detect Low current standby operation High noise immunity due to differential bus implementation

LCD

16

SCHEMATIC DIAGRAM KEIL VISIONVision3 is an IDE (Integrated Development Environment) that helps you write, compile, and debug embedded programs. It encapsulates the following components:A project manager.A make facility.Tool configuration.Editor.A powerful debuggerSAMPLE CODE org 00h back: mov P1,#55h acall delay mov P1,#0AAh lcall delay sjmp backdelay: mov r5,#30h again: djnz r5,again ret end

APPLICATIONSMulti-master broadcast serial busBit ratesMessage basedprotocolFlexCANCANopenLocal Interconnect NetworkFlex RayGMLANSocketcanOSEK

CAN milestones

1983: Start of the Bosch internal project to develop an in-vehicle network 1986: Official introduction of CAN protocol 1987: First CAN controller chips from Intel and Philips Semiconductors 1991: Boschs CAN specification 2.0 published 1991: CAN Kingdom CAN-based higher-layer protocol introduced by Kvaser .1992: CAN in Automation (CiA) international users and manufacturers group established 1992: CAN Application Layer (CAL) protocol published by CiA 1992: First cars from Mercedes-Benz used CAN network 1993: ISO 11898 standard published 1994: 1st international CAN Conference (iCC) organized by CiA 1994: DeviceNet protocol introduction by Allen-Bradley 1995: ISO 11898 amendment (extended frame format) published 1995: CANopen protocol published by CiA 2000: Development of the time-triggered communication protocol for CAN (TTCAN)

CONCLUSION The project CAN PROTOCOL IMPLEMENTATION FOR DATACOMMUNICATION has been successfully designed and tested. CAN protocol implementation has many advantages and it can be used in various important functions such as data communication in a very secured manner and is also very useful in private messages and also used in variousgovernment applications

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