Question

For the following 4-bit operation, assuming these register are ONLY 4-bits in size, which status flags are on after performing the following operation? Assume 2's complement representation. 1010+0110
a) с
b) Z
c) N

Answer 1

Answer:

All flags are On ( c, z , N  )

Explanation:

Given data:

4-bit operation

Assuming 2's complement representation

Determine status flags that are on after performing 1010+0110

    1   1

    1  0   1  0

    0  1   1  0

  1  0 0 0 0

we will carry bit = 1 over

hence C = 1

given that: carry in = carry out there will be zero ( 0 ) overflow

hence V = 0

also Z = 1      

But the most significant bit is  N = 1