20.1.2. Microinstructions and Microprograms

Try these first

1. 1.

   What are microinstructions?

   Hint

   Think about how they relate to broader instructions.

2. 2.

   Define a microprogram.

   Hint

   What does it manage within a computer?

3. 3.

   What are microinstructions?

   • High-level instructions
   • Low-level instructions
   • Administrative commands

   Hint

   Think about the layer of operations they compose.

4. 4.

   True or False: Microprogrammed control units execute faster than hardwired control units.

   • True
   • False

   Hint

   Reflect on why fixed circuits might be faster.

5. 5.

   Design a basic microprogram for a system that adds two numbers in registers R1 and R2 and stores the result in R3. Describe the sequence of microinstructions.

   Hint

   Think about how the ALU operates and registers interact.

6. 6.

   Explain how the microprogram counter would handle a jump instruction based on a flag indicating overflow in an add operation.

   Hint

   Consider how branching changes the flow.