凤舞天(网名)大牛写的书籍，提供了一种单片机系统的架构和模板，对于复杂的单片机系统设计非常实用，同时也可以用来初步理解嵌入式操作系统。(This is a book written by Fengwutian(nick name online). It provides a kind of architecture and template for MCU system program. It is very useful for complicated MCU system program design. And it is also useful for understanding simply embeded systems.)