The Control Unit controls the flow of data around the CPU by following the fetch, decode, execute cycle, , The Program Counter increments by one whenever an instruction is fetched from the RAM, , The MAR holds any memory address about to be used by the CPU, , The MDR holds the actual data or instruction about to be used by the CPU, , The Accumulator stores any on-going calculations carried out by the ALU , , The ALU does all the calculations in the CPU, , The Cache is very fast memory in the CPU, it stores regularly used data., .

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