The CPU is made up of three main parts
The Arithmetic Logic Unit, or ALU
The Control Unit
& The Registers
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The Arithmetic Logic Unit performs all arithmetic and logical operations. This happens during the execute stage of the FDE cycle
The Control Unit controls the flow of data within the CPU, and decodes instructions during decode stage of the FDE cycle
The Registers hold data and instructions which are about to be used by the CPU. During fetch stage of the FDE cycle, data is moved from primary storage to the registers.
