2.2.2. Move Instruction Example

Try these first

1. 1.

   Provide an example of when the zero flag is set.

   Hint

   Think of subtracting a number from itself.

2. 2.

   What does the sign flag indicate?

   Hint

   Look at the most significant bit of the result.

3. 3.

   What occurs when an overflow happens in signed arithmetic?

   • The result is invalid
   • The sign bit is lost
   • A carry is generated

   Hint

   Think about the consequences of carrying over in binary.

4. 4.

   The carry flag is relevant to signed arithmetic. True or False?

   • True
   • False

   Hint

   Reflect on the differences between signed and unsigned arithmetic.

5. 5.

   If you add two 4-bit signed numbers 0111 and 1001, what will the result be? Discuss the effects on flags.

   Hint

   Convert to binary, add them up, and check the sign and overflow.

6. 6.

   Write a segment of code that checks if a number is positive, negative, or zero and directs flow appropriately.

   Hint

   Think about how `IF` statements work in programming logic.