CENTRAL PROCESSING UNIT

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CENTRAL PROCESSING UNIT
The Bapatla Collage of Arts and Since
B. Mohini Devi
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INTRODUCTION

• In the last chapter we saw why a storage system
  is required in a computer.
• We also saw the need to have several levels of
  storage.
• In this chapter we will describe the Central
  Pricessing Unit (CPU) which is the brain of the
  computer, how it works and how it cooperates with
  other units of a computer.

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THE STRUCTURE OF A CENTRAL PROCESSING UNIT

• A block diagram of acomputer is given
• The main purpose of a cpu is to retrieve
  instuctions from memory , interpret them and
  carry out the operations soesified in the
  instructions

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SPECIFICATION OF CPU

• The variety of instuctions it is designed to
  interpret and execute.

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INTERCONNECTION OF CPU WITH MEMORY AND I/O UNIT

• We saw that instruction to be executed by a CPU
  are retrieved from the main memory interpreted by
  it and executed.

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EMBEDDED PROCESSORS

• So far we have discussed whst are known as
  genaral purpose processors.
• Genarl purpose processors are used in PCs and
  other computers utilized in day-to-day data
  processing jobs such as calculation of payrolls,
  word processing , bus reservation, etc.

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MICROCONTROLLERS

• Microcontrollers are programmed to cycle through
  a set of states based on the occurrence of some
  events

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