What is the function of a Memory Address Register in a CPU?

The Memory Address Register (MAR) plays a critical role in the function of a CPU by holding the memory address that the CPU uses to access data from the system's memory. When the CPU needs to read data from memory or write data to memory, it must first specify the exact location in memory where the operation is to occur. The MAR acts as a temporary holding area for this address.

When a program is executed, the CPU fetches instructions and data from memory, using the address stored in the MAR to locate where that information resides. This is essential for the processing of data, as it allows the CPU to efficiently retrieve and manipulate information stored in RAM. By using the MAR in this way, the CPU can carry out tasks with speed and precision, ensuring that the correct data is accessed during operations.

The other options do not align with the specific function of the MAR. For instance, while output handling, processed data storage, and user input management are vital functions within a computer system, they are typically managed by different components within the CPU or other peripheral devices, rather than the MAR itself.