This book is dedicated to single-chip microcontrollers with ultra-low consumption of the Texas Instruments MSP430x2xx family. This guide is a translation of the "MSP430x2xx Family User's Guide" document released by the company in 2008. The manual details the architecture of the CPU MSP430 and MSP430x, describes the command system and supported addressing modes. In addition, the book describes in detail the various peripheral modules implemented in the microcontrollers of the family. timers, input ports/output, ADC and DAC modules, modules serial interfaces USI/USCI and others, as well as analog modules, such as operating amplifier module and analog comparator module. This guide, without any exaggeration, can be considered a desktop book by a developer engineer engaged in the design of devices on microcontrollers of the MSP430x2xx family. In addition, the completeness and clarity of the presentation of the material allows us to recommend this book to students of relevant specialties and trained radio amateurs.