16.4.2. Updating the Program Counter

Try these first

1. 1.

   What does the program counter (PC) do?

   Hint

   Think about what directs the CPU to the next instruction.

2. 2.

   Define an unconditional jump instruction.

   Hint

   Consider how it operates without needing a check.

3. 3.

   What type of jump transfers control without checking any conditions?

   • Conditional Jump
   • Unconditional Jump
   • Indirect Jump

   Hint

   Which type of jump executes every time?

4. 4.

   True or False: Conditional jumps always execute.

   • True
   • False

   Hint

   What would make a jump dependent?

5. 5.

   If the PC is currently at address 500 and the instruction is 'JZ 505', but the zero flag is not set, what will the new PC be?

   Hint

   Think about what happens when zero flag is not set.

6. 6.

   Describe the process by which a jump to an address 3030 is executed. Include the role of temporary registers and condition checks.

   Hint

   Review the steps of how the PC is updated and how temporary registers aid in jumps.