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CPU Flashcards
OCR GCSE J277 Computer Science specification
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Purpose of the CPU
The CPU (Central Processing Unit) executes instructions and processes data, acting as the brain of the computer.
Fetch–Execute Cycle
The process where the CPU fetches an instruction from memory, decodes it, and executes it.
Control Unit (CU)
The CU controls the flow of data within the CPU and coordinates the execution of instructions.
Cache
A small, fast memory located close to the CPU that stores frequently used data and instructions to speed up processing.
Von Neumann: MAR
The Memory Address Register holds the address of the memory location to be accessed.
Von Neumann: MDR
The Memory Data Register holds the data that is being transferred to or from memory.
Von Neumann: Program Counter
The Program Counter holds the address of the next instruction to be executed.
Von Neumann: Accumulator
The Accumulator stores intermediate results of calculations performed by the ALU.
CPU Performance: Clock Speed
Clock speed is the number of cycles per second, measured in Hz, affecting how fast instructions are processed.
CPU Performance: Cache Size
A larger cache size allows more data to be stored close to the CPU, improving processing speed.
CPU Performance: Number of Cores
More cores allow multiple instructions to be processed simultaneously, improving multitasking and performance.

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