star A Computer Architecture Quiz 2

Which register holds the address of the next instruction to be executed?

• Instruction Register (IR)

• Program Counter (PC)

• Memory Address Register (MAR)

• Accumulator (AC)

In direct addressing, the instruction contains:

• The operand itself

• The address of the operand

• A pointer to the operand’s address

• An offset value

Which is a characteristic of RISC architecture?

• Complex instructions

• Variable-length instruction formats

• Emphasis on hardware optimization

• Large number of general-purpose registers

The instruction LOAD R1, 2000 uses which addressing mode?

• Immediate

• Direct

• Indirect

• Register

What does an opcode in an instruction code specify?

• The data to be used

• The operation to be performed

• The address of the operand

• The register to be used

Which register is used to store intermediate arithmetic and logic results?

• Program Counter

• Accumulator

• Memory Address Register

• Stack Pointer

What is the correct sequence of steps in the instruction cycle?

• Decode → Fetch → Execute

• Fetch → Decode → Execute

• Execute → Fetch → Decode

• Fetch → Execute → Decode

CISC processors are characterized by:

• Simple instructions

• Fixed-length instructions

• Complex instructions that may take multiple cycles

• Large number of registers

The instruction INC R1 performs which operation?

• Increments the contents of R1 by 1

• Increments the address of R1 by 1

• Sets R1 to 1

• No operation

Which addressing mode uses a register to hold the address of the operand?

• Immediate

• Direct

• Register Indirect

• Indexed