@book{81,
	author = {Hall, Douglas V.},
	title = {Microprocessors and interfacing :},
	publisher = { McGraw-Hill,},
	year = {2012.},
	address = {New Delhi :},
	edition = {3rd ed.},
	url = {https://books.google.com.pk/books?id=FcKjAgAAQBAJ&pg=PR4&dq=9781259006159&hl=en&sa=X&ved=0ahUKEwj64uqRuMnLAhXkNJoKHUEXC60Q6AEIGTAA#v=onepage&q=9781259006159&f=false}
}