This book is a comprehensive guide to Microchip's PIC family of microcontrollers, the industry standard for embedded digital devices. The book describes in detail the architecture and command system of 8-bit PIC microcontrollers, using specific examples to study the operation of their peripheral modules. The first part outlines the basics of digital circuitry, mathematical logic and computer system architecture. The second part is devoted to various aspects of programming mid-level PIC microcontrollers: the instruction set is described, writing programs in assembly language and high-level language (C), as well as support for subroutines and interrupts are considered. The third part examines the hardware aspects of interaction between the microcontroller and the outside world and interrupt handling. Topics covered include parallel and serial data input/output, timing, analog signal processing, and EEPROM usage. Finally, an example of the development of a real device is given. This example also demonstrates the simplest debugging and testing techniques used in the development of real devices. The book is designed for a wide range of readers - from amateurs to engineers, while understanding the material contained in it does not require any special knowledge in the field of programming, electronics or digital circuitry. This book will also be useful to students studying in the specialties “Radio Electronics” and “Computer Engineering”, who will be able to use it as a teaching aid when taking relevant courses or completing course projects.