1.1.1 Structure and function of the processor

Question 1

What is the function of the ALU?

Answer 1

• Completes all of the arthimatical and logical operations
• Arithmatic operations include: addition, subtraction and floating point number.
• Logical operations include boolean logic operations such as: AND, OR, NOT, and XOR.

Question 2

What is the function of the Control Unit.

Answer 2

• Directs operations of the CPU:
• Controlling and coordinating the activities of the CPU
• Managing the flow of data between the CPU and other devices
• Accepting the next instruction
• Decoding instruction
• Storing the resulting data in memory

Question 3

What are registers?

Answer 3

• Small memory cells that operate at a very high speed
• Temporarily store data
• All airthmetic,logical and shift operations occur in these

Question 4

What is the PC?

Answer 4

• Program Counter
• Holds the address of the next instruction to be executed.