Understanding the Fetch-Decode-Execute Cycle

What are the three main functions of a computer?

• Storage, Processing, Output

• Input, Storage, Output

• Input, Processing, Storage

• Input, Processing, Output

Which component of a computer is responsible for carrying out instructions?

• Hard Drive

• Central Processing Unit (CPU)

• Memory

• Graphics Card

During the fetch stage, what is the first thing that happens?

• The instruction is executed

• The program counter is checked

• The memory address register is updated

• The data is decoded

What does the memory address register (MAR) do during the fetch stage?

• Increments the program counter

• Stores the current instruction

• Holds the address of the next instruction

• Sends the address to main memory

What are the two parts of an instruction in the decode stage?

• Address and Data

• Opcode and Address

• Opcode and Operand

• Instruction and Data

What does the operand part of an instruction contain?

• The result of the operation

• The actual data or the address of the data

• The address of the next instruction

• The operation to be performed

What happens during the execute stage?

• The program counter is incremented

• The instruction is fetched from memory

• The instruction is decoded

• The instruction is carried out by the CPU

In the example program, what does the first fetch-decode-execute cycle do?

• Outputs a value to the user

• Loads a value into the accumulator

• Stores a value in memory

• Adds two numbers

What is the purpose of the program counter in a branching program?

• To decode the current instruction

• To execute the current instruction

• To hold the address of the next instruction

• To store the current instruction

What does the opcode 0110 represent in the example program?

• Store operation

• Load operation

• Add operation

• Branch always