How the ALU Works with Other Components
Part of Arithmetic Logic Unit (ALU) — GCSE Computer Science
This key facts covers How the ALU Works with Other Components within Arithmetic Logic Unit (ALU) for GCSE Computer Science. Revise Arithmetic Logic Unit (ALU) in Systems Architecture for GCSE Computer Science with 15 exam-style questions and 12 flashcards. This topic appears less often, but it can still be a useful differentiator on mixed-topic papers. It is section 5 of 6 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 5 of 6
Practice
15 questions
Recall
12 flashcards
How the ALU Works with Other Components
- Gets data from: Accumulator (ACC) and registers/memory
- Controlled by: Control Unit (tells ALU which operation to perform)
- Stores results in: Accumulator (ACC) - results overwrite previous ACC value
- When it operates: During the EXECUTE stage of the FDE cycle
Example flow: Instruction "ADD 5" → Control Unit tells ALU "perform addition" → ALU takes current ACC value (8), adds 5 → Result (13) goes back to ACC