computer literacy

1. INTRODUCTION TO
COMPUTER APPLICATIONS -KBCL111
THE CPU
• It is made up of the Control Unit
(CU) and the Arithmetic/ Logic Unit
COMPUTER FUNCTIONS

2. CPU FUNCTIONS
• Secondary storage: The CPU stores data and programs
• Output: Makes processed information available

3. The Control Unit (CU)
CU fetches an instruction from the memory and puts it into a
register
CU decodes the instruction and determines the memory
location of the data required
Execution
CU moves the data from memory to registers in the ALU
ALU is given control and executes the instruction
Control returns to the CU
CU stores the result of the operation in memory or in a
register

4. The Control Unit (CU)
• Is part of the hardware that is in-charge
• Directs the computer system to execute stored program
instructions
• Communicates with other parts of the hardware
• Fetches an instruction from memory and puts it into a
register.
• Decodes the instruction and determines the memory
loaction of the data required.

5. CU functions contd...
Execution
• moves the data memory to registers in the

6. Arithmetic/Logic Unit (ALU)
• Performs arithmetic operations e.g. Addition,
subtraction,multiplication and division.
• Performs logical operations i.e.evaluates conditions,
makes comparisons, can compare numbers, letters and
special characters