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Lauraine
LauraineThe fetch-execute cycle, also known as the instruction cycle, takes place within the CPU (Central Processing Unit) of a computer system. Here’s how it generally works:
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Fetch: The CPU fetches instructions from the computer’s memory (RAM) or cache. The address of the next instruction to be executed is typically stored in a register called the Program Counter (PC).
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Decode: The CPU decodes the fetched instruction into a series of signals that control other parts of the CPU. This step determines what operation the instruction specifies and what data it involves.
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Execute: The CPU performs the operation or actions specified by the decoded instruction. This might involve calculations, data movement, or control flow changes (like branching to another part of the program).
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Write back (optional): If the executed instruction modifies data, the CPU may write the results back to memory or registers.
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The fetch-execute cycle, also known as the instruction cycle, takes place within the CPU (Central Processing Unit) of a computer system. Here’s how it generally works:
Fetch: The CPU fetches instructions from the computer’s memory (RAM) or cache. The address of the next instruction to be executed is typically stored in a register called the Program Counter (PC).
Decode: The CPU decodes the fetched instruction into a series of signals that control other parts of the CPU. This step determines what operation the instruction specifies and what data it involves.
Execute: The CPU performs the operation or actions specified by the decoded instruction. This might involve calculations, data movement, or control flow changes (like branching to another part of the program).
Write back (optional): If the executed instruction modifies data, the CPU may write the results back to memory or registers.
This cycle repeats continuously, fetching, decoding, and executing instructions sequentially or as directed by control flow instructions (like branches and jumps). It is fundamental to how a CPU processes instructions and performs computations in a computer system.