Computing GCSE - CPU components flashcards

Control unit

Decodes instructions and controls how data moves around the CPU

Arithmetic logic unit

Performs calculations and makes logical decisions

Cache

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

Registers

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

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.

Memory data register

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

Program counter

Holds the address of the next instruction

Accumulator

Holds the results of calculations.