The results are usually written to a CPU register, where later instructions can reference them. In the final step, the decoded instructions are sent to the relevant parts of the CPU to be completed. This converts the instruction into signals to be passed through to other parts of the CPU for action. Once an instruction is fetched and stored in the IR, the CPU passes the instruction to a circuit called the instruction decoder. Subsequently, the PC length is increased to reference the next instruction's address. The PC and instructions are then placed into an Instruction Register (IR). The current instruction address is held by a program counter (PC). Each instruction is only one small part of any operation, so the CPU needs to know which instruction comes next. The instruction is represented as a series of numbers and is passed to the CPU from the RAM. Just as you may expect, fetching involves receiving an instruction.
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