在各种不同类型的嵌入式系统中，以单片微控制器(Microcontroller)作为系统的主要控制核心所构成的单片嵌入式系统（国内通常称为单片机系统）占据着非常重要的地位。本书将介绍以PAX270微控制器为核心的单片嵌入式系统的原理、硬软件设计、调试等应用方法。-In a variety of different types of embedded systems to single-chip microcontroller (Microcontroller) as the core of the system posed by the main control chip embedded systems (often referred to as SCM domestic system) occupies a very important position. PAX270 book introduces single-chip microcontroller as the core principle of embedded systems, hardware and software design, debugging and other application methods.