13.3.3. Designing Control Steps for Different Instructions

Try these first

1. 1.

   What does the Program Counter (PC) do?

   Hint

   Think about where instructions come from.

2. 2.

   Name the register that holds the current instruction in execution.

   Hint

   Find out which register holds the instruction.

3. 3.

   What is the first step in executing an instruction?

   • Load instruction from memory
   • Increment the Program Counter
   • Fetch data from registers

   Hint

   Consider which action comes before fetching the instruction.

4. 4.

   True or False: The Memory Address Register (MAR) holds instructions.

   • True
   • False

   Hint

   Think about the role of MAR during instruction execution.

5. 5.

   Design a control signal flow chart for the instruction LOAD R2, M.

   Hint

   Start with noting down the sequence of actions taken from the PC to the registers.

6. 6.

   Explain how a conditional instruction like JUMP affects the control steps designed for instructions.

   Hint

   Think about control flow and how condition affects execution path.