seminar embedded lknow

7/31/2019 SEMINAR Embedded Lknow

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SEMINAR

ONEMBEDDED SYSTEMS


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About CETPA InfoTech

CETPA InfoTech Pvt. Ltd., a Indian MultinationalISO 9001 : 2008 Certified company working inthe field of Software & Embedded Development .CETPA is COMPUTER EDUCATION ANDTECHNOLOGY PROMOTION ASSOCIATION.

CETPA is a group of professionals who areworking for the promotion of technology .

It gives Summer/ Industrial Training Program inEmbedded System, Advance Embedded System,MATLAB, ANSYS, AutoCAD, C & C++,ANDROID.


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Overview

Introduction to Embedded Systems

Applications of Embedded Systems

8051 Micro-controller

Addressing Modes of 8051 Micro-controller Micro-controller (8051) Interfacing

Advantages of Embedded Systems

Conclusion


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Introduction to Embedded Systems

Definition: An Embedded System is one that hascomputer hardware with software embedded in it asone of its important components.

SOFTWARE PROGRAM

#include #use delay (clock=20000000)#byte PORTB=6main(){set_tris_b(0);portb=255; //decimaldelay_ms(1000);portb=0x55; //hexadecimaldelay_ms(1000);portb=0b10101010; //binary

delay_ms(500);}

Its software embeds inROM (Read OnlyMemory). It does not needsecondary memories as in

a computer

HARDWARE


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Embedded system employs a combination ofsoftware & hardware to perform a specific

function. Embedded systems are generally based on

Micro-Processor, Micro-Controller .

Television, Radio, CD player, Robots, Microwave

Oven, Security systems, Printers, Wirelessphones are examples of Embedded Systems.


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Embedded SystemGeneral Block Diagram


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Embedded systems Applications

a) Biomedical Instrumentation ECGRecorder, Imaging systems, patient monitorsystem.

b) Communication systems Pagers, cellularphones, Network routers, fax , Satellites.

c) Computer peripheralsPrinter, scanner,keyboards, displays, modems, hard disk drives,

CD-ROM drives .


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d) Industrial Instrumentation Process

controller, DC motor controller, robotic systems

e) Aerospace : Navigation systems, automaticlanding systems, flight attitude controls,

RADAR, SONAR, space exploration (e.g. TheMars Pathfinder)


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A THINKING ROBOT EQUIPPED WITHSOPHISTICATED LASER EYES AND AUTOMATEDPROGRAMMING REACTED TO UNPLANNEDEVENTS ON THE SURFACE OF MARS

SOJOURNER ROVER


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8051 Micro-controller

A microcontroller is a single silicon chip withmemory and Input/Output peripherals on it.Hence a microcontroller is also popularly knownas a single chip computer. Normally, a single

microcomputer has the following features :

Arithmetic and logic unit

Memory for storing program

EEPROM for nonvolatile data storage

RAM for storing variables and special functionregisters

Input/output ports


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Timers and counters

A/D converter

Circuits for reset, power up, serial programming,debugging

Instruction decoder and a timing and control unit

Serial communication port

It is like a single chip computers that is oftenembedded into other systems to function as

processing/controlling unit.

Fig. 8051 Micro-controller


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Block Diagram of Micro-controller

CPU RAM ROM

I/OPort

Timer SerialCOMPort

A Single Chip

Popular Micro-controllers are:

Intel- 8048, 8051,80186,80188

Motorola-MC14500,68HC05, 683xx

PIC-16F876A, Z8 (Zilog)


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Features of 8051Micro-controller

FEATURE QUANTITY

ROM 4K bytes

RAM 128 bytes

Timer 2

I/O pins 32

Serial port 1

Interruptsources

6


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Addressing Modes of 8051

Micro-controller

Immediate Addressing Mode

Register Addressing Mode

Direct Addressing Mode

Indirect Addressing Mode

Indexed Addressing Mode


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Immediate Addressing Mode :Instructions using #; e.g. : MOV A, #n

MOV Rr,#n

Register Addressing Mode:Registers A and R0 to R7;e.g. : MOV A ,Rr

MOV Rr , A

Direct Addressing Mode:All 128 bytes (00h to 7Fh) of RAM and SFRs (80to FFh) may be accessed directly. e.g. :

MOV A,ADD MOV ADD,A MOV Rr , ADD MOV ADD , #n MOV ADD1,ADD2


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Indirect Addressing Mode

Registers R0 or R1 used as data pointers (00h to 7Fh)

@ symbol is used

MOV @Rp,#n

MOV @Rp,ADD

MOV @Rp,A

MOV ADD,@Rp MOV A,@Rp

Indexed Addressing Mode

The MOVC instruction is used along with DPTR (DataPointer) and the Accumulator; A

MOVC A,@A+DPTR


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Micro-controller Interfacing

The following interfacing can be done withmicro-controller (8051):

1) LEDs

2) LCD3) Seven Segment and many more


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Features

80C51 Central Processing Unit.

5 V Operating voltages from 0 MHz to 40 MHz.

16/32/64 KB of on-chip Flash user code memorywith ISP (Flash programmer).

Supports 12-clock (default) or 6-clock modeselection via software or ISP.

SPI (Serial Peripheral Interface) and enhancedUART.

Four 8-bit I/O ports with three high-current Port1 pins.

Three 16-bit timers/counters.


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LEDs Interfacing

A light-emitting diode (LED) is asemiconductor light source. LEDs are used asindicator lamps in many devices, and areincreasingly used for lighting.


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The LED is based on the semiconductor diode.

When a diode is forward biased, electrons areable to recombine with holes within the device,releasing energy in the form of photons. This

effect is called electroluminescence

The LEDs in a 7 segment display may beconnected in common anode or in common-

cathode configuration.


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LED Interfacing with 8051


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LCD Interfacing


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LCD Interfacing with 8051


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Seven Segment Interfacing

Seven-segment displays contains thearrangement of the LEDs in Eight (8) passion,and a Dot (.) with a common electrode, lead(Anode or Cathode).


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Types of Seven Segment

Common Cathode (CC)All the 8 anode legs uses only one cathode, whichis common.

Common Anode (CA)The common leg for the entire cathode is ofAnode type.


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Advantages of EmbeddedSystems

Low cost

Compact

Speed High reliability

Rugged


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Conclusion

Embedded systems have virtually entered everysphere of our life and in the field of Electronics.

The possibilities in this field are only limited by

the imagination.

Many of the embedded systems are managed byhuman controllers or by man machine interface

for example a cell phone, a TV screen or a PCinterface. It is this MMI that often represents themost costly investment in the systemsdevelopment, in terms of both time and money.


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ANY QUERIES ????


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THANKS

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