1. Objective
On completion of this period, you would be able
to learn:
Functional Blocks of CPU.
http://improvec.blogspot.in/ 1

2. Recap
 What is a computer?
It is an electronic device which processes the
computer’s data.
 Functional units of computer.
Input unit, memory unit, CPU, output unit.
http://improvec.blogspot.in/ 2

3. Prerequisites
 What are parts of the computer?
Input unit ,memory unit, CPU, output unit.
 What is CPU?
Central Processing Unit.
http://improvec.blogspot.in/ 3

4. CPU
(Central processing unit)
http://improvec.blogspot.in/ 4

5. CPU
 CPU is the heart and brain of the computer.
 It receives data as input.
 It processes the data according to the
instructions.
 And gives results as output.
http://improvec.blogspot.in/ 5

6. CPU (contd)
 Its primary function is to execute programs.
 Beside executing programs,
the CPU also controls the operation of all other
components such as memory, input and output
devices.
http://improvec.blogspot.in/ 6

7. CPU (contd)
 Under its control , programs and data are stored
in the memory
 And it displays the data on the CRT screen or
prints on the printer.
 The CPU of a small computer is called
microprocessor.
http://improvec.blogspot.in/ 7

8. CPU (contd...)
 The CPU of a large computer contains a number
of microprocessors and other ICs on one or
more circuit boards.
http://improvec.blogspot.in/ 8

9. Functional Block of CPU
 ALU (Arithmetic & Logical Unit)
 Timing & Control unit
 Registers
http://improvec.blogspot.in/ 9

10. Blocks of CPU:
Fig 1 http://improvec.blogspot.in/ 10

11. CPU (Central processing unit) :
ALU (Arithmetic Logic Unit) :
 It performs two types of operations
1. Arithmetic Operations
2. Logical operations.
http://improvec.blogspot.in/ 11

12. Arithmetic operations
1. Addition(+)
2. Subtraction(-)
3. Multiplication(*)
4. Division(/)
Logical operations:
AND OR
NOT EXCLUSIVE OR
http://improvec.blogspot.in/ 12

13. Timing & Control unit
Acts as the brain of a computer
It controls the operations of a CPU
Synchronizes the operations of various
devices
Generates timing signals such that
coordination among devices take place
http://improvec.blogspot.in/ 13

14. CPU
Fig 2 http://improvec.blogspot.in/ 14