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CU - GCSE Computer Science Definition

Reviewed by: Robert Hampton

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What is the CU?

In GCSE Computer Science, the CU (Control Unit) is defined as a component of the CPU, responsible for coordinating how data moves by sending signals to control the flow of the data.

The CU plays a crucial role in the decode stage of the fetch-decode-execute cycle, responsible for decoding the instructions fetched from memory.

Diagram of a computer system showing ALU, Control Unit, Registers (ACC, MDR, PC, MAR), and Cache. The Control Unit is highlighted in red.
Illustration of the internal components of the CPU

CU Revision Resources to Ace Your Exams

Explore the CU in more detail and master other key related terms such as the arithmetic logic unit (ALU) and cache in our revision note pages here:

CPU components & their function (OCR GCSE Computer Science)
CPU components & their function (AQA GCSE Computer Science)
CPU components & their function (Edexcel GCSE Computer Science)

Challenge yourself with our expertly created topic questions and reinforce your learning with our interactive flashcards. 

GCSE Computer Science Revision Resources

Need help reaching your target grade? Explore our notes, questions by topic and worked solutions, tailor-made for GCSE Computer Science.

Explore GCSE Computer Science

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Robert Hampton

Reviewer: Robert Hampton

Expertise: Computer Science Content Creator

Rob has over 16 years' experience teaching Computer Science and ICT at KS3 & GCSE levels. Rob has demonstrated strong leadership as Head of Department since 2012 and previously supported teacher development as a Specialist Leader of Education, empowering departments to excel in Computer Science. Beyond his tech expertise, Robert embraces the virtual world as an avid gamer, conquering digital battlefields when he's not coding.

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