Embedded System Basics - Introduction.ppt

EMBEDDED SYSTEM BASICS AND
APPLICATIONS

TOPICS TO BE DISCUSSED
• System
• Embedded System
• Components
• Classifications
• Processors
• Other Hardware
• Software
• Applications
2

3
INTRODUCTION
What is a system?
A system: is a way of working, organizing or doing one
or many tasks according to a fixed plan, program or set
of rules.
A system: is also an arrangement in which all its units
assemble and work together according to the plan or
program.

SYSTEM EXAMPLES
WATCH
It is a time display SYSTEM
Parts:
Hardware, Needles, Battery, Dial, Chassis and Strap
Rules
1. All needles move clockwise only
2. A thin needle rotates every second
3. A long needle rotates every minute
4. A short needle rotates every hour
5. All needles return to the original position after 12 hours
4

5
WASHING MACHINE
It is an automatic clothes washing SYSTEM
Parts:
Status display panel, Switches & Dials, Motor, Power supply &
control unit, Inner water level sensor and solenoid valve.
Rules
1. Wash by spinning
2. Rinse
3. Drying
4. Wash over by blinking
5. Each step display the process stage
6. In case interruption, execute only the remaining
SYSTEM EXAMPLES

6
EMBEDDED SYSTEM
Definition: An Embedded System is one that has computer hardware
with software embedded in it as one of its important components.
SOFTWARE PROGRAM
#include <16f876a.h>
#use delay (clock=20000000)
#byte PORTB=6
main()
{
set_tris_b(0);
portb=255; //decimal
delay_ms(1000);
portb=0x55; //hexadecimal
delay_ms(1000);
portb=0b10101010; //binary
delay_ms(500);
}
Its software embeds in ROM (Read Only Memory). It does not
need secondary memories as in a computer
HARDWARE

COMPUTER HARDWARE
7
A Microprocessor
A Large Memory
(Primary and Secondary)
(RAM, ROM and caches)
Input Units
(Keyboard, Mouse, Scanner, etc.)
Output Units
(Monitor, printer, etc.)
Networking Units
(Ethernet Card, Drivers, etc.)
I/O Units
(Modem, Fax cum Modem, etc.)

COMPONENTS OF EMBEDDED SYSTEM
• It has Hardware
Processor, Timers, Interrupt controller, I/O Devices, Memories,
Ports, etc.
• It has main Application Software
may perform concurrently the series of tasks or multiple tasks.
• It has Real Time Operating System (RTOS)
It defines the way the system work, which supervise the
application software. It sets the rules during the execution of the
application. A small scale embedded sys may not need an RTOS.
8

EMBEDDED SYSTEM CONSTRAINTS
An embedded system is software designed to keep in view
three constraints:
• System memory
• Processor speed
• Limit of the power dissipation
When running the system continuously in cycles of wait for
events, run, stop and wakeup.
10

What makes embedded systems different?
•Real-time operation
•Size
•Cost
•Time
11
•Safety
•Energy
•Security
•Reliability

CLASSIFICATIONS OF EMBEDDED SYSTEM
1. Small Scale Embedded System
2. Medium Scale Embedded System
3. Sophisticated Embedded System
12

SMALL SCALE EMBEDDED SYSTEM
• Single 8 bit or 16bit Microcontroller.
• Little hardware and software complexity.
• They May even be battery operated.
• Usually “C” is used for developing these system.
• The need to limit power dissipation when system is running continuously.
Programming tools:
Editor, Assembler and Cross Assembler
13

MEDIUM SCALE EMBEDDED SYSTEM
• Single or few 16 or 32 bit microcontrollers or Digital Signal
Processors (DSP) or Reduced Instructions Set Computers (RISC).
• Both hardware and software complexity.
Programming tools:
RTOS, Source code Engineering Tool, Simulator, Debugger and
Integrated Development Environment (IDE).
14

SOPHISTICATED EMBEDDED SYSTEM
• Enormous hardware and software complexity
• Which may need scalable processor or configurable processor and
programming logic arrays.
• Constrained by the processing speed available in their hardware units.
Programming Tools:
For these systems may not be readily available at a reasonable cost or
may not be available at all. A compiler or retargetable compiler might
have to be developed for this.
15

PROCESSOR
• A Processor is the heart of the Embedded System.
• For an embedded system designer knowledge of microprocessor
and microcontroller is a must.
Two Essential Units: Operations
Control Unit (CU), Fetch
Execution Unit (EU) Execute
16

VARIOUS PROCESSOR
1. General Purpose Processor (GPP)
Microprocessor
Microcontroller
Embedded Processor
Digital signal Processor
2. Application Specific System Processor (ASSP)
3. Multi Processor System using GPPs
17

MICROPROCESSOR
• A microprocessor is a single chip semi conductor device also
which is a computer on chip, but not a complete computer.
• Its CPU contains an ALU, a program counter, a stack pointer,
some working register, a clock timing circuit and interrupt
circuit on a single chip.
• To make complete micro computer, one must add memory
usually ROM and RAM, memory decoder, an oscillator and a
number of serial and parallel ports.
18

HISTORY OF MICROPROCESSOR
1st Generation (4 bit processors)
4004 and 4040 4 bit in early 1970 by Intel (Integrated Electronics)
2nd Generation (8 bit processors)
8008 and 8080 8 bit in 1974 Intel with +5 V Input supply 8080  8085 8 bit
3rd Generation (16 bit processors)
8086 16 bit. Same as 8086, the 8088 introduced 8088 has only 8 bit data bus
(This made it easier to interface to the common 8 bit peripheral devices available
at the time)
Followed by:
The 80186 & 80286 (16 bit processor), the 80386 & 80486 (a 32 bit processor),
leading to the Pentium range of microprocessors (64 bit processors) available
today. The 80x86 and Pentium processors have all been designed for use in
personal computer type applications and have large memory maps.
19

VARIOUS MICROPROCESSORS
Intel
4004, 4040
8080, 8085
8086, 8088,
80186, 80188
80286, 80386
x86-64
Motorola
6800
6809
68000
G3, G4, G5
Zilog
Z80, Z180, eZ80
Z8, eZ8
and others
20

MICROCONTROLLER
• A microcontroller is a functional computer system-on-a-chip.
It contains a processor, memory, and programmable
input/output peripherals.
• Microcontrollers include an integrated CPU, memory (a small
amount of RAM, program memory, or both) and peripherals
capable of input and output.
21

VARIOUS MICROCONTROLLERS
INTEL
8031,8032,8051,8052,8751,8752
PIC
8-bit PIC16, PIC18,
16-bit DSPIC33 / PIC24,
PIC16C7x
Motorola
MC68HC11
22

MICROPROCESSOR Vs MICROCONTROLLER
MICROPROCESSOR MICROCONTROLLER
The functional blocks are ALU,
registers, timing & control units
It includes functional blocks of
microprocessors & in addition has
timer, parallel i/o, RAM, EPROM, ADC &
DAC
Bit handling instruction is less, One
or two type only
Many type of bit handling instruction
Rapid movements of code and data
between external memory & MP
Rapid movements of code and data
within MC
It is used for designing general
purpose digital computers system
They are used for designing application
specific dedicated systems
23

EMBEDDED PROCESSOR
• Special microprocessors & microcontrollers often called,
Embedded processors.
• An embedded processor is used when fast processing fast
context-switching & atomic ALU operations are needed.
Examples : ARM 7, INTEL i960, AMD 29050.
24

DIGITAL SIGNAL PROCESSOR
• DSP as a GPP is a single chip VLSI unit.
• It includes the computational capabilities of microprocessor and
multiply & accumulate units (MAC).
• DSP has large number of applications such as image processing,
audio, video & telecommunication processing systems.
• It is used when signal processing functions are to be processed fast.
Examples : TMS320Cxx, SHARC, Motorola 5600xx
25

APPLICATION SPECIFIC SYSTEM PROCESSOR (ASSP)
• ASSP is dedicated to specific tasks and provides a faster
solution.
• An ASSP is used as an additional processing unit for
running the application in place of using embedded
software.
Examples : IIM7100, W3100A
26

MULTI PROCESSOR SYSTEM USING GPPs
• Multiple processors are used when a single processor does
not meet the needs of different task.
• The operations of all the processors are synchronized to
obtain an optimum performance.
27

Moore’s Law
• Moore's law describes a long-term trend in the history of
computing hardware.
• Since the invention of the integrated circuit in 1958, the number
of transistors that can be placed inexpensively on an integrated
circuit has increased exponentially, doubling approximately every
two years.
• The trend was first observed by Intel co-founder Gordon E.
Moore in 1965.
• Almost every measure of the capabilities of digital electronic
devices is linked to Moore's law: processing speed, memory
capacity, etc.
28

OTHER HARDWARE
• Power Source
• Clock Oscillator
• Real Time Clock (RTC)
• Reset Circuit, Power-up Reset
and watchdog timer Reset
• Memory
• I/O Ports, I/O Buses
• Interrupt Handler
• DAC and ADC
• LCD and LED Display
• Keypad/Keyboard
30

SOFTWARE
SIMULATOR
Masm
31
SOFTWARE
C
C++
Dot Net
COMPILER
RIDE
KEIL

•Household appliances:
Microwave ovens, Television, DVD
Players & Recorders
•Audio players
•Integrated systems in aircrafts and
missiles
•Cellular telephones
•Electric and Electronic Motor controllers
•Engine controllers in automobiles
•Calculators
• Medical equipments
•Videogames
•Digital musical instruments, etc.
APPLICATIONS
32

Embedded System Basics - Introduction.ppt

Recommended

More Related Content

Similar to Embedded System Basics - Introduction.ppt (20)

More from alaakaraja1 (6)

Recently uploaded (20)

Embedded System Basics - Introduction.ppt

Editor's Notes