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The Registars within CPU are special purpose tempary storage locations. The important registars, within CPU are, programn counter(PC). A programn counter keeps track of next instruction to be executed. Instruction Registar(IR) is a registar which holds instruction to be decoded by the control unit. Then memory address registar(MAR), is a registar which points to the memory location which the CPU plans to access, either for reading or for writing. MBR(memory buffer registar) which is also refered to as memory data registar(MDR) is used for storage data either coming to the CPU or data being transferred by the CPU. Acculmular(ACC) is a general purpose registar used for storing operands, temporary results and results produced by arithmetic logic unit. Besides these a processor can have many other registars. But these are the most the basic and most esstintial registars necessary for any CPU. |