Learn: The ALU - Arithmetic vs Logic

Welcome!You've already learned about why the CPU is essential, the fetch-decode-execute cycle, and the role of registers. Now, let's dive deeper into one of the CPU components: the ALU (Arithmetic Logic Unit) and explore its functions.

What is the ALU?The Arithmetic Logic Unit is a key part of the CPU. It performs arithmetic operations like addition and subtraction, and logical operations like AND, OR, and NOT. Without the ALU, the CPU wouldn't be able to process numbers or make decisions.

Arithmetic OperationsArithmetic operations include calculations such as addition, subtraction, multiplication, and division. For example, when software needs to calculate 5 + 3, the ALU handles this task.

Logical OperationsLogical operations help the CPU make decisions based on conditions. The ALU processes operations like AND (both conditions true), OR (either condition true), and NOT (reverses a condition). These are used in programming and comparison tasks.

How Does the ALU Work?The ALU receives instructions from the Control Unit, along with the required data stored in registers. It then performs the operation (arithmetic or logical) and sends the result back to the registers for further processing or output.

Review Time!Great work! You've learned about the ALU, its arithmetic and logical operations, and how it interacts with other CPU components. Now let's test your understanding with a few questions.