Learn: Programme Counter

Welcome!Today we are learning about the Programme Counter, an important component of the CPU. Let's explore its role in the Fetch–Decode–Execute cycle step by step!

What is the Programme Counter?The Programme Counter (PC) is a special register in the CPU. Its main job is to hold the memory address of the next instruction to be executed. It helps the CPU keep track of where it is in a sequence of instructions.

How Does the Programme Counter Work?During the Fetch–Decode–Execute cycle, the Programme Counter ensures that instructions are fetched from the correct memory address. After fetching an instruction, the Programme Counter increments to point to the next address. This ensures the CPU works efficiently and executes instructions in the correct order.

Why is the Programme Counter Important?The Programme Counter is vital because it ensures instructions are executed in sequence. Without it, the CPU wouldn't know which instruction to fetch next, leading to errors or inefficiency in running programmes.

Incrementing the Programme CounterAfter the CPU fetches an instruction, the Programme Counter updates itself to point to the next memory address. This is called incrementing. For example, if the current address is 101, it will increment to 102 to prepare for the next instruction.

Review Time!Great work! You've learned about the Programme Counter and its role in the CPU. Now let's test your understanding with a few questions.