14.3. Addressing Modes

Try these first

1. 1.

   Define immediate addressing and provide an example.

   Hint

   Think about how operands are represented in the instruction.

2. 2.

   What is direct addressing?

   Hint

   Consider how the CPU needs to look up data.

3. 3.

   What is immediate addressing?

   • The operand is directly in the instruction
   • The operand is in memory
   • It involves multiple memory lookups

   Hint

   Think about how an instruction would include numerical constants.

4. 4.

   True or False: Indirect addressing can reduce instruction length.

   • True
   • False

   Hint

   Consider how addressing can save space in instructions.

5. 5.

   Design an instruction that uses indirect addressing, showing the steps and control signals needed.

   Hint

   Think about how you’ll need to do two memory accesses.

6. 6.

   Explain why immediate addressing might be preferred in certain scenarios. Provide a coding example using an assembly language syntax.

   Hint

   Consider speed and efficiency in design.