Learn: The Control Unit - Controlling the CPU

Welcome!You've already learned about the CPU's role, the fetch-decode-execute cycle, and how registers work. Today, we'll build on that by exploring the Control Unit, which directs the CPU's operations.

What is the Control Unit?The Control Unit (CU) is a key component of the CPU. It manages and coordinates all the activities happening inside the CPU. It ensures instructions are carried out in the correct order and directs the flow of data between the CPU and other parts of the computer.

How Does It Work?The CU fetches instructions from memory and decodes them. It then sends signals to the appropriate components, such as the Arithmetic Logic Unit (ALU) or registers, to execute the instructions. This process ensures that each step of the fetch-decode-execute cycle runs smoothly.

Control SignalsThe CU generates control signals to communicate with different parts of the CPU. These signals ensure that data flows correctly and components like the registers and ALU perform their tasks at the right time.

Interaction with RegistersThe Control Unit works closely with registers like the Program Counter (PC) and Memory Address Register (MAR). It uses these components to locate and manage instructions stored in memory.

Review Time!Great work! You've learned about the role of the Control Unit, its interactions with other CPU components, and how it uses control signals. Let's test your understanding with a few questions.