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The instruction cycle is the cycle that the central processing unit (CPU) follows from the operation is stored in the main memory or sent to an output device. The machine instruction cycle · 1. Fetch the instruction · 2. Decode the instruction · 3. Execute · 4. Store result · Data Bus: A data bus is a connection between These instructions are executed by the processor by going through a cycle for input-output devices act as an interface between the machine and the user. The CPU repetitively performs fetch , decode , execute cycle to execute one program instruction. The machine cycle is part of the instruction cycle. For the central processing unit (CPU) the machine cycle is considered a list of steps to execute the machine instruction in the computer processor. The CPU can interpret the contents of memory either as instructions or as data according to the fetch-execute cycle. The von Neumann Machine:.Understand how instructions are encoded in binary and processed by the CPU with GCSE Computer science.