Embedded Syatem

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A PRESENTATION ON on


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NEED

OF EMBEDDED SYSTEM An embedded system is a special-purpose computer systemdesigned to perform one or a few dedicated functions often withreal-time computing constraints. It is usually embedded as partof a complete device including hardware and mechanical parts.

In contrast, a general-purpose computer, such as a personalcomputer, can do many different tasks depending onprogramming. Embedded systems control many of the commondevices in use today.

Since the embedded system is dedicated to specific tasks, design

engineers can optimize it, reducing the size and cost of theproduct, or increasing the reliability and performance. .


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HISTORY

When computers came into the market in the 1940s,they were all Embedded Systems. However, they werenever regarded as Embedded Systems because, firstly,

they were regarded as computers; and secondly,because they were too large and uncouth to beformally termed as Embedded Systems.


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An embedded system is a computersystem designed to perform one or a few dedicatedoften with real-time computing constraints.

It is embedded as part of a complete device oftenincluding hardware and software parts.

SoftwareHardware

Interface


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Designed to do a specific task. Simplified system hardware. Less costly. In the form of small computerized parts in larger

devices. Required limited computer hardware resources. Little memory and small keyboard or screen .


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Communications Automotive automatic braking Military applications Missile

guidance systems Industrial applications Robotics


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8/24Traffic LightDVD player

Digital clockMoving message display


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CPU General-PurposeMicro-

processor

RAM ROM I/O Port TimerSerialCOM

Port

Data Bus

Address Bus

General Purpose Microprocessor System

CPU for Computers No RAM, ROM, I/O on CPU chip itself Example--Intel s x86: 8086,8088,80386,80486, Pentium

Many chips on mother board

General-purpose microprocessor


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RAM ROM

I/O PortTimerSerialCOMPort

Microcontroller

CPU

A smaller computer. On-chip RAM, ROM, I/O ports... Example:- Motorola s 6811, Intel s 8051 and PIC

16X

A single chip

Microcontroller


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Microprocessor CPU is stand-alone, RAM, ROM,

I/O, timer are separate designer can decide on the

amount of ROM, RAM and I/O

ports. expensive general-purpose Ex. 8085,8086 mp, Motorola

6800, Intel s 8086, etc.

Microcontroller CPU, RAM, ROM, I/O and timer are

all on a single chip fix amount of on-chip ROM, RAM,

I/O ports

for applications in which cost, powerand space are critical single-purpose Ex. 8051, PIC mc, Motorola MC s,

Phillips, etc.

Microprocessor v/s Microcontroller


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The 8051 is the first microcontroller of the MCS-51family introduced by Intel Corporation at the end of the1970s.

The 8051 family characteristics: o 4K Bytes ROM o 128 Bytes RAM o two timer/counters (16 bit) o A serial port o 32 input/output port o Interrupt controller


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1234567891011121314151617181920

4039383736353433323130292827262524232221

P1.0P1.1P1.2P1.3P1.4P1.5P1.6P1.7RST

(RXD)P3.0(TXD)P3.1

(T0)P3.4(T1)P3.5

XTAL2XTAL1

GND

(INT0)P3.2(INT1)P3.3

(RD)P3.7(WR)P3.6

VccP0.0(AD0)P0.1(AD1)P0.2(AD2)P0.3(AD3)P0.4(AD4)P0.5(AD5)P0.6(AD6)P0.7(AD7)EA/VPP

ALE/PROGPSENP2.7(A15)P2.6(A14)P2.5(A13)P2.4(A12)P2.3(A11)P2.2(A10)P2.1(A9)P2.0(A8)

8051 IC

8051


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Vcc(+5volt) Pin - 40

Ground(0 volt) Pin-20

Pin Description


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Pin Description

Port 0 from Pin-39 to pin-32

Used to excess both data & address

Dual functional


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Pin Description

Port 1 from Pin-1 to pin-8

Used as I/O port


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Pin Description

Port 2 from

Pin-21 to pin-28

Used to excess address & as I/O port


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Pin Description

Port 3 fromPin-10 to Pin-17

P3.0 RXDP3.1 TXD P3.2 IN T0

P3.3 IN T1P3.4 T0

P3.5 T1 P3.6 WRP3.7 RD


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Smart card

ATM

Health card

Robotics


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A different type of compiler is used for compiling inprogrammable data terminal. This software follow the steps below:

1. Create a project to select the 8051 Device and thetool settings.

2. Create source files in C or Assembly. 3. Build your application with the Project manager. 4. Correct errors in source files.

5. Test linked application


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PROTEUS SOFTWARE

Proteus simulates the circuit and the output can bechecked..

January 26, 2014


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FLASH MAGICFlash magic is used to burn the microcontroller whichmeans to save hex file in microcontroller

January 26, 2014


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THA NK YOU !!!!!. ......

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Embedded Syatem