Fetch and Execute Cycle

Which of these comes first?

• Control unit places opcode in Instruction Register.

• Control unit increments the Program Counter to point to the next instruction.

• Control unit fetches the opcode from the memory location indicated by the Program Counter.

• Control unit fetches any required operand.

• Control unit activates necessary circuits to execute the instruction.

Which of these comes second?

• Control unit places opcode in Instruction Register.

• Control unit increments the Program Counter to point to the next instruction.

• Control unit fetches the opcode from the memory location indicated by the Program Counter.

• Control unit fetches any required operand.

• Control unit activates necessary circuits to execute the instruction.

Which of these comes third?

• Control unit places opcode in Instruction Register.

• Control unit increments the Program Counter to point to the next instruction.

• Control unit fetches the opcode from the memory location indicated by the Program Counter.

• Control unit fetches any required operand.

• Control unit activates necessary circuits to execute the instruction.

Which of these comes fourth?

• Control unit places opcode in Instruction Register.

• Control unit increments the Program Counter to point to the next instruction.

• Control unit fetches the opcode from the memory location indicated by the Program Counter.

• Control unit fetches any required operand.

• Control unit activates necessary circuits to execute the instruction.

Which of these comes fifth?

• Control unit places opcode in Instruction Register.

• Control unit increments the Program Counter to point to the next instruction.

• Control unit fetches the opcode from the memory location indicated by the Program Counter.

• Control unit fetches any required operand.

• Control unit activates necessary circuits to execute the instruction.

What is the final step in the Fetch and Execute Cycle?

Which step is this in the cycle?

Control unit places opcode in Instruction Register. Step:

Which step is this in the cycle?

Control unit increments the Program Counter to point to the next instruction. Step:

Which step is this in the cycle?

Control unit fetches any required operand. Step:

Which step is this in the cycle?

Control unit activates necessary circuits to execute the instruction. Step: