Which of the following is NOT a common CPU register?

Which of the following is NOT a common CPU register?

• A. Program Counter
• B. Data Register
• C. Address Register
• D. Memory Access Register

Answer: (D)

The correct choice identifies "Memory Access Register" as the option that is not a common CPU register. In most CPU architectures, there are several well-defined registers that serve specific functions, and the majority of these are found in the list of common registers. The Program Counter holds the address of the next instruction to execute, serving as a critical component in instruction sequencing. The Data Register is typically used to hold the data that is being processed, making it essential for arithmetic and data transfer operations. The Address Register is used to store memory addresses, crucial for accessing specific locations in memory for both reading and writing data. Although "Memory Access Register" may sound plausible, it is not a standard term typically used in the context of CPU architecture. Instead, access to memory in CPUs is usually handled via the Data Registers and Address Registers in conjunction with other specific mechanisms (like buses and caching) rather than through a dedicated register with that exact name. Thus, it is not recognized as a common CPU register, making this the correct answer.

The correct choice identifies "Memory Access Register" as the option that is not a common CPU register. In most CPU architectures, there are several well-defined registers that serve specific functions, and the majority of these are found in the list of common registers.

The Program Counter holds the address of the next instruction to execute, serving as a critical component in instruction sequencing. The Data Register is typically used to hold the data that is being processed, making it essential for arithmetic and data transfer operations. The Address Register is used to store memory addresses, crucial for accessing specific locations in memory for both reading and writing data.

Although "Memory Access Register" may sound plausible, it is not a standard term typically used in the context of CPU architecture. Instead, access to memory in CPUs is usually handled via the Data Registers and Address Registers in conjunction with other specific mechanisms (like buses and caching) rather than through a dedicated register with that exact name. Thus, it is not recognized as a common CPU register, making this the correct answer.