This slightly revised 4th edition includes two example projects from the earlier editions not found in the third edition but is otherwise unchanged. As before it includes a massive amount of information about the 8051-family of microcontrollers and techniques for programming them in the C language. There is a strong emphasis on interrupt-driven programming and operating systems as well as many algorithms related to typical microcontroller interfacing. There is extensive ground-up coverage of serial interfacing and small-area networks.