An instruction cycle (sometimes called fetch-and-execute cycle, fetch-decode-execute cycle, or FDX) is the basic operation cycle of a computer. It is the process by which a computer retrieves a program instruction from its memory, determines what actions the instruction requires, and carries out those actions. This cycle is repeated continuously by the central processing unit (CPU), from bootup to when the computer is shut down.
Read more about Instruction Cycle: Circuits Used, Initiating The Cycle, Fetch Cycle, Decode, Read The Effective Address, Execute Cycle, The Fetch-Execute Cycle in Transfer Notation
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