14.2. Basic Unit Summary

Try these first

1. 1.

   What does the program counter do in the instruction execution process?

   Hint

   Think about what needs to happen first in an instruction cycle.

2. 2.

   Define immediate addressing.

   Hint

   Recall an instruction example that uses this mode.

3. 3.

   What is the first step in instruction execution?

   • Loading the ALU
   • Loading the Program Counter
   • Transferring the instruction

   Hint

   Think about where the execution process begins.

4. 4.

   True or False: Immediate addressing requires additional memory access compared to direct addressing.

   • True
   • False

   Hint

   Consider how the operand is made available in each mode.

5. 5.

   Design a simple assembly instruction sequence for loading data from memory using direct addressing and then storing it after adding a constant.

   Hint

   Think about the sequence of addressing modes used.

6. 6.

   Analyze how the number of cycles differs when executing a direct vs. indirect addressing instruction.

   Hint

   Consider how many times memory is accessed in each case.