To fetch an instruction from the internal memory of the processor, various components of the processor have to be activated. Which are they?
Hi
Program Counter, Address Bus, Memory Address Register, Instruction Register and Instruction Buffer Register. Program Counter stores the instruction address. Address Bus fetches the instruction address and drops it in Memory Address Register. Then a control signal is issued to fetch the instruction present at that address. The instruction is then fetched using data bus and dropped into Instruction Register. From here, it goes into a decoder for decoding. If more than one instructions are present, the second instruction is stored in Instruction Buffer Register.
