1.1.1. Structure and function of the processor

What does the Arithmetic and Logic unit do?

• completes all the arithmetical and logical operations.
• holds the address of the next instruction.
• Holds the address of a location that is to be read from or written to.
• Temporarily stores the data that has just been read from or the data needs to be written.

What is the Control Unit?

• A part of the processor which directs operations inside the CPU.
• Small memory cells that operate at high speeds
• holds the address of the next instruction.
• Holds the address of a location that is to be read from or written to.
• Temporarily stores the data that has just been read from or the data needs to be written.

What are registers?

• Small memory cells that operate at high speeds
• A part of the processor which directs operations inside the CPU.
• holds the address of the next instruction.
• Holds the address of a location that is to be read from or written to.
• Temporarily stores the data that has just been read from or the data needs to be written.

Where do all the arithmetic, logic, or shift operations occur?

• They occur in registers
• PC
• MAR
• MDR

What does the Program Counter (PC) do?

• holds the address of the next instruction.
• Holds the address of a location that is to be read from or written to.
• Temporarily stores the data that has just been read from or the data needs to be written.
• Small memory cells that operate at high speeds
• A part of the processor which directs operations inside the CPU.

In which register do all calculations take place?

• The Accumulator.

• Cache

• PC

• MAR

• MDR

What does the Memory Address Register do?

• Holds the address of a location that is to be read from or written to.
• Temporarily stores the data that has just been read from or the data needs to be written.
• Small memory cells that operate at high speeds
• A part of the processor which directs operations inside the CPU.
• holds the address of the next instruction.

What does the Memory Data Register do?

• Temporarily stores the data that has just been read from or the data needs to be written.
• Small memory cells that operate at high speeds
• A part of the processor which directs operations inside the CPU.
• holds the address of the next instruction.
• Holds the address of a location that is to be read from or written to.

What does the Current Instruction Register do?

• Holds the current instruction divided up into opcode and operand.
• Small memory cells that operate at high speeds
• A part of the processor which directs operations inside the CPU.
• holds the address of the next instruction.
• Holds the address of a location that is to be read from or written to.

What is a Bus?

• A set of parallel wires connecting two or more components together.
• A bidirectional bus used to transport data and instructions between components
• The bi-directional bus used to transmit control signals between internal and external components
• Used to transmit the memory address specifying where data is to be sent from or retrieved from.