The document introduces computer applications and describes the functions of the CPU and its components. The CPU is made up of the control unit and arithmetic/logic unit. The control unit fetches instructions from memory, decodes them to determine the required data location, moves data between memory and registers, and directs the ALU to perform operations before storing results. The ALU performs arithmetic and logical operations on data.

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