Register - GCSE Computer Science Definition

Reviewed by: Robert Hampton

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What is a Register?

In GCSE Computer Science, a register is defined as extremely small, extremely fast memory located in the CPU.

A register holds small amounts of data that are needed immediately by the CPU during the fetch-execute/fetch-decode-execute cycle.

Each register performs a specific task.

Common examples of registers located in the CPU include:

  • Memory address register (MAR)

  • Memory data register (MDR)

  • Accumulator (ACC)

  • Program counter (PC)

Register Revision Resources to Ace Your Exams

Explore registers in more detail and master other key related terms such as the memory address register (MAR) and memory data register (MAR) 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.

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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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