Question

What values are in the status register after the operation 1000 + 1111 for a 4-bit ALU? ("+" means addition)
Z:  
V:  
C:  
N:

Answer 1

1000 + 1111 = 010111

8 + 15 = 23

Z is zero bit

V is overflow bit

C is carry bit

N is negative bit

Zero bit will be turned on if the output is 0 but output isn't zero so zero register will be turned off 0

Overflow bit will turn on if the set result is greater than 127 and less than -128 in our case it will be 0

Carry bit will turn on because we on the left most bit carry was generated it will be 1

Negative bit will be turn of because the result is positive so it will be 0

So, the values of all status registers are below

Z: 0000

V: 0000

C: 0001

N: 0000:

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