Learn: The ALU - Arithmetic vs Logic

Welcome!You've already learned about the CPU's role, the fetch-decode-execute cycle, and how registers help manage instructions. Today, we'll focus on the ALU (Arithmetic Logic Unit) and its role in processing data.

What is the ALU?The Arithmetic Logic Unit (ALU) is part of the CPU that performs calculations and logical operations. It handles tasks like addition, subtraction, and comparisons (e.g., greater than, equal to). This allows the computer to make decisions and process data.

Arithmetic OperationsThe ALU performs arithmetic operations like addition, subtraction, multiplication, and division. For example, if the computer needs to calculate 5 + 3, the ALU handles this task.

Logical OperationsThe ALU also performs logical operations. These include comparisons (e.g., is one number greater than another?) and decisions based on conditions (e.g., 'If this is true, do X'). Logical operations are essential for decision-making in programs.

Inputs and OutputsThe ALU takes inputs from registers, processes them using arithmetic or logical operations, and then outputs the results to registers. These results can be used in the next steps of the fetch-decode-execute cycle.

Review Time!Great work! You've learned about what the ALU does, its arithmetic and logical operations, and how it processes data. Let's test your understanding with a few questions.