CPU, Memory, and Software Concepts

What is the initial step in the fetch-decode-execute cycle?

• Execute the instruction

• Decode the instruction

• Fetch the instruction

• Store the result

Which register holds the instruction currently being executed?

• MAR

• CIR

• ACC

• MDR

What occurs during the decode phase of the cycle?

• The ALU carries out calculations

• The Control Unit interprets the instruction

• Data moves to the MDR

• The Program Counter resets

What happens to the Program Counter after an instruction is fetched?

• It resets to zero

• It moves to the next instruction

• It executes the instruction

• It holds the current instruction

Which component is responsible for arithmetic and logic operations?

• MAR

• MDR

• ALU

• CU

What is the primary function of the Memory Address Register (MAR)?

• Stores the address of the next instruction

• Holds the instruction being executed

• Performs arithmetic operations

• Manages data flow

Which register temporarily holds data that is being read from or written to memory?

• PC

• MAR

• MDR

• CIR

What is the main role of the Control Unit (CU)?

• Store temporary data

• Execute instructions

• Coordinate CPU operations

• Perform calculations

Where are the results of ALU operations stored?

• PC

• ACC

• CIR

• MDR

What does the Memory Data Register (MDR) do?

• Holds the next instruction's address

• Temporarily stores data moving between memory and CPU

• Executes program instructions

• Controls input and output devices