Training Manual . 3rd edition . , overdraft. and dop. Biisk, AltSTU, 2011. 122 s. In the training manual, the AT89 microcontroller . is considered in detail C51 AT89 family of ATMEL. Information on the popular programming package of the company 2500 A. D. The main emphasis is placed on the description of typical applications of the microcontroller with a detailed description of the principles of connecting various peripherals to it and examples of control programs. The given material will be useful to students of specialties 200106 "Information-measuring equipment and technologies" and 230201 "Information systems and technologies" when performing their laboratory work. Calculated Tasks, course projects and for in-depth study of the principles of construction and programming of microcontroller devices .