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How does the fetch-decode-execute cycle work a level?

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How does the fetch-decode-execute cycle work a level?

During the fetch execute cycle, the computer retrieves a program instruction from its memory. It then establishes and carries out the actions that are required for that instruction. The cycle of fetching, decoding, and executing an instruction is continually repeated by the CPU whilst the computer is turned on.

How are the registers used in the fetch decode and execute cycle?

The way registers are used to run programs is often known as the FETCH – DECODE – EXECUTE cycle. This is because that is all the CPU actually does. It fetches instructions, decodes them and then executes them. It does this very quickly indeed, but that is all it does.

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How does the CPU execute program instructions?

How Does a Program Run? The CPU runs instructions using a “fetch-execute” cycle: the CPU gets the first instruction in the sequence, executes it (adding two numbers or whatever), then fetches the next instruction and executes it, and so on.

What parts of the fetch-decode-execute cycle are performed by the ALU?

It manages the four basic operations of the Fetch Execute Cycle as follows:

  • Fetch – gets the next program command from the computer’s memory.
  • Decode – deciphers what the program is telling the computer to do.
  • Execute – carries out the requested action.
  • Store – saves the results to a Register or Memory.

What does the execute part of the cycle do?

In this video the Fetch-Decode-Execute cycle is explained by Marc Scott. Now let’s look at how the CPU can perform calculations using a process known as the fetch, decode, execute cycle. Here we have a representation of a CPU and RAM. The registers are also shown, where data can be temporarily stored.

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How would you describe the fetch execute cycle?

Fetch. The instruction is collected from a memory location.

  • Decode
  • Execute
  • Store. Send and write the results back in main memory. The newly processed data is then passed back in to memory fresh from its processing via the data bus.

    • What are facts about the fetch execute cycle?

    Here’s a summary of the fetch – decode – execute cycle: The processor reviews the program counter to see which command to execute next. The program counter gives an address value in the memory of where the next command is. The processor fetches the command value from the memory location. Once the command has been fetched, it needs to be decoded and executed.

    What is the fetch execute cycle on a computer?

    fetches a program instruction from its memory,

  • determines what the instruction wants to do,
  • and carries out those actions.