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 delve deeper into the Arithmetic Logic Unit (ALU), an important part of the CPU!

What is the ALU?The Arithmetic Logic Unit (ALU) is a key component of the CPU. It performs all the arithmetic (e.g., addition, subtraction) and logical (e.g., comparisons, AND/OR/NOT) operations needed for processing instructions. This makes it essential for executing tasks in any computer system.

Why is the ALU important?The ALU handles the calculations and decision-making processes inside the CPU. Without the ALU, the CPU wouldn't be able to perform computations or make logical decisions, such as comparing numbers or evaluating conditions.

Arithmetic OperationsThe ALU handles mathematical calculations like addition, subtraction, multiplication, and division. For example, when you add two numbers in a calculator, the ALU performs this operation.

Logical OperationsLogical operations involve making decisions based on conditions. Examples include AND, OR, and NOT. These operations help the computer decide what to do next during processing.

How does the ALU work?The ALU receives data from the registers in the CPU and processes it using arithmetic or logical operations. For example, it might add two values from the Accumulator and store the result back in the register.

Examples of Arithmetic and Logic OperationsThe ALU might add two numbers, such as 5 + 3 = 8, or compare two values, such as 5 > 3, and return true. These operations are combined during the fetch-decode-execute cycle to complete tasks.

Review Time!Great work! You've learned about the Arithmetic Logic Unit (ALU), its role, and the types of operations it performs. Let's test your understanding with a few questions.