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Central Processing Unit _CPU_

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									Central Processing
         Unit (CPU)
Central Processing Unit (CPU)
   ‘Brain’ of the computer
   Performs the change of data into information
   Accepts data from any input device, changes
    this data according to instructions given by
    the user and send the result to an output
    device
Explains how computers process data (input- raw text, numbers)
into information (output)
Central Processing Unit (CPU)
   Consists of the
         Control Unit
         Arithmetic Logic Unit (ALU)
         Registers
Control Unit
   Directs and coordinates the entire hardware
    system
   Organises the flow of data in a computer
   Similar to traffic lights controlling the flow of
    traffic
   It interprets each instruction given by a
    program and gives appropriate action to be
    carried out
     Arithmetic Logic Unit (ALU)
   Performs data calculations including addition,
    subtraction, division and multiplication
   Performs comparisons on data items
Registers
   Temporary storage area for small amounts of
    data or instructions before and after
    processing.
   Some of the different registers are:
        Accumulator Register – stores data to be processed
        Buffer Register – stores data coming from or being
         sent to primary storage, e.g printing a document
        Address Register – stores location of data in primary
         storage
        Instruction Register – stores the address if the next
         instruction to be processed
Microprocessor
   A central processing unit contained on one
    integrated circuit
   If the processor is built onto a single
    microchip it is called a microprocessor
   Used in PC’s, cameras, DVD players etc.
Development of CPU speeds
   Moore's Law - the number of transistors per
    integrated circuit doubles about once every
    two years, while the price of the chip remains
    the same.
    Development of CPU speeds
   Intel's graph showing growth in the number of transistors over the
    past 35 years
Development of CPU speeds
Central Processing Unit (CPU)
Questions:
1. Describe the role of the CPU.

2. List and explain the three parts of the CPU

3. What is a microprocessor and where are
   they used?

								
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