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How Data Flows in a Computer System

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					How Data Flows in a Computer
          System
    The Central Processing Unit
            Lesson Objectives
Know – how data flows around a computer system

 Understand – the function of the CPU


 Do draw blocks diagrams of how data flows
 around a computers system and a block drawing of
 the CPU
                     Data Flow
Data flows around the computer via the form of electrical
impulses called bits. A computer can only recognise ‘0’ and
‘1’( Binary Code). We will look at this in our next lesson.
All data flows in and out of the Central Processing Unit.


Lets take a closer look
  YOU MUST LEARN THIS:




           BACKING STORE:
             HARD DISK



            CENTRAL
 INPUT                      OUTPUT
           PROCESSING
DEVICE                      DEVICE
              UNIT


           MAIN MEMORY:
                RAM
          How the CPU works

The Central Processing Unit (CPU) of a
computer is the main processor which
operates the computer - ie it carries out
the instructions of the program being run.
The CPU has three main parts...
    •The A.L.U. (Arithmetic and Logic
    Unit) which performs all the
    calculations.
    •The Control Unit - which controls
    the flow of data round the computer by
    sending out control signals.
    •Memory - which is used to store
    data.
Basic Diagram of the CPU
    CU- Control Unit
    ALU- Arithmetic and
    Logic Unit
    Memory
                 Today's Task
•Draw a diagram and explain how data flows around a
computer system
•Draw a diagram of the CPU and explain what each
component is used for
•Find out the correct meanings for RAM and ROM

				
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posted:8/29/2011
language:English
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