Control Unit - Controls and monitors data transfer between different input and output hardware components and decodes the machine code, Arithmetic Logic Unit - Every operation takes place here. This is where the arithmetic (eg adding two binary numbers) and logic operations (eg checking to see if one number is bigger than another) take place., Bus - Wires through which data and instructions are transferred between computer components, Registers - Memory locations on the CPU. Much faster than cache and RAM however also much smaller. Used to store frequently accessed data and instructions., Clock - The purpose is to keep all the CPU components synchronised. The speed of transfer of data is limited by the speed of light and so data takes time to travel between components even if this is only nanoseconds, but all the components do need to be synchronised.,

Components of a CPU

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