15.1.1. Fetching the Instruction

Try these first

1. 1.

   What does the Program Counter (PC) do?

   Hint

   Think about what guide the CPU follows for processing steps.

2. 2.

   Name one advantage of using register indirect addressing.

   Hint

   Consider how many addresses you process.

3. 3.

   What is the purpose of the Memory Address Register (MAR)?

   • To hold data temporarily
   • To hold the next instruction
   • To hold the address of the next instruction or memory data

   Hint

   Remember, the MAR points to where data is located.

4. 4.

   Is indirect addressing mode faster than register indirect mode?

   • True
   • False

   Hint

   Think about how many steps each mode takes.

5. 5.

   Design a flowchart to depict the steps taken in both indirect addressing and register indirect addressing modes. Identify which steps are reduced in register indirect.

   Hint

   Use clear labels to indicate where each mode diverges.

6. 6.

   Critically evaluate a scenario where indirect addressing might still be preferred despite its drawbacks. Explain your reasoning.

   Hint

   Consider how applications may require changing addresses but maintain stable operands.