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Control Unit (CU): The control unit is the circuitry that controls the flow of information through the processor, and coordinates the activities of the other units within it. In a way, it is the "brain within the brain", as it controls what happens inside the processor, which in turn controls the rest of the PC.

Arithmetic and Logic Unit (ALU): The ALU is a part of the CPU that can carry out arithmetic operations - addition and subtraction and, depending on the processor, multiplication and division, logic operations - AND, OR, NOT, XOR and bit-shift operations - shift bits in a word either left or right. (This corresponds to multiplying or dividing by 2.)

Decoder: The decoder is a logic circuit that exists to take the binary representation of an instruction and initiate the execution of the appropriate instruction. It usually exists as part of the control unit.

Registers: Registers are small pieces of memory located inside the CPU. They can be thought of as the hardware version of a variable in software

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Q: What are the CPU's support elements?
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