Computing GCSE - CPU components flashcards

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8 Terms

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Control unit

Decodes instructions and controls how data moves around the CPU

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Arithmetic logic unit

Performs calculations and makes logical decisions

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Cache

Memory inside of the CPU. Means faster access to frequently used instructions and data.

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Registers

Tiny stores of high speed memory inside the CPU. Holds data that are needed during processing.

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Memory Address Register

Stores the location in memory to be used by the MDR. Holds the address of where data is to be fetched or stored.

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Memory data register

Holds data fetched from, or to be written to main memory.

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Program counter

Holds the address of the next instruction

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Accumulator

Holds the results of calculations.