In a computer system, which of the following two registers are used by the CPU to transfer the data between processor and memory ?

In a computer system, the CPU interacts with the memory through two primary registers to facilitate data transfer:

• Memory Address Register (MAR): This register holds the memory address of the data that needs to be accessed (either for reading or writing). It is connected to the address bus.
• Memory Data Register (MDR): Also known as the Memory Buffer Register (MBR), it holds the actual data being transferred to or from the memory location specified by the MAR. It is connected to the data bus.

Other registers like the Program Counter (PC) (which holds the address of the next instruction) and the Instruction Register (IR) (which holds the current instruction being executed) are essential for the instruction cycle but do not directly handle the data transfer interface between the processor and memory.