Question

What is the N flag used for?

Answer 1

In an assembly language, N flag stands for Negative flag.
This flag is set if the result after supervising the operation is negative.
The Flag simply inspect the most significant bit of the result after any operation . In several architecture we use a flag called as Overflow ,which is used to check if the most significant bit of the result has been changed.

In a computer system, the negative flag or N flag is an individual bit in an operation (flag) register used to demonstrate whether the outcome of the last mathematical method attained a value in which the largely significant bit is set.

for example:

MVI A 40(load 40H in register A)
MVI B 50(load 50H in register B)
SUB B
These instructions will set the sign flag to 0 as the result is a negative number.



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