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Summary Strucutre and the function of the processor notes

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This document contains notes for 1.1.1a notes using all the previous OCR markchemes for computer science A levels.









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April 9, 2025
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1.1.1a
Central Processing Unit (CPU) :
Brain of the of the computer

It executes instructions which allows programs to run


Control Unit (CU) :
A part of the processor which directs operations inside the CPU

Manages the fde cycle

Sends control signals to coordinate movemenet of data through the execute
instruction

Decodes instructions

Control buses


Arithmetic Logic Unit (ALU ) :
The ALU completes all the arithmetic and logical operations

Used to temporarily hold the results in the accumulator ( where operation is
stored)


Registers :
Registers are small memory cells that operate at a very high speed. They are used
to temporarily store data and all arithmetic, logical and shift operations occur in
these registers.

Accumulator (ACC) :



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