Question

Content of flag register of 8085 Microprocessor is 55H. Write its bit pattern and give interpretations.

Answer 1

The content of flag register of 8085 is 55H.

= 0 1 0 1   0 1 0 1 

Flag register	S	Z	–	AC	–	P	–	Cy
Given: 55H	0	1	0	1	0	1	0	1

In this also consider, 

S = 0 = Reset = Accumulator content is a positive outcome.

Z = 1 = set = The accumulator's content is 0.

AC = 1 = set = Shows that a carry is created from bit D₃ to bit D₄ during an arithmetic operation.

P = 1 = set = Indicates that there are even more 1s present in the accumulator.

Cy = 1 = set = This indicates that the most important bit is carried or borrowed when performing an arithmetic operation.