This Paper Provides basic fundamentals to be used while designing logic gates in a digital circuit as we know that logic gates are nothing but the technique used for calculation of unknown’s also provide how microprocessor instruction set is get affected due designing of logical gates. Instruction sets are used for simulative approach of digital circuit in Microprocessor which is later used in assembly language programming. Logic gates are constructed using diodes or transistors, but can also be constructed using electromagnetic relays (relay logic), fluidic logic, pneumatic logic, optics, molecules, or some of mechanical elements also plays important role in the construction of logic gates . Connecting output of fist logic gate into input ...