CENTRAL PROCESSING UNIT
INTRODUCTION
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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.
THE STRUCTURE OF A CENTRAL
PROCESSING UNIT
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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
SPECIFICATION OF CPU
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The variety of instuctions it is designed to
interpret and execute.
INTERCONNECTION OF CPU WITH MEMORY
AND I/O UNIT
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We saw that instruction to be executed by a
CPU are retrieved from the main memory
interpreted by it and executed.
EMBEDDED PROCESSORS
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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.
MICROCONTROLLERS
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Microcontrollers are programmed to cycle
through a set of states based on the occurrence
of some events