说明：  本书第一篇主要结合硬件电路设计与制作的全过程，以设计制作一个MP3播放器（具有U盘功能）的全过程为线索，向读者展示硬件电路设计的流程与方法，电路调试的方法与思路等。第二篇主要结合AT89C51SNl芯片的MP3程序设计过程，阐述C51在单片机程序设计中的应用。第三篇主要讲述U盘海量存储设备系统设计与调试等知识。
(This book first major combination of hardware circuit design and making the entire process to design produce an MP3 player (with a U disk function) of the whole process as clues to the reader showing the hardware circuit design processes and methods, circuit debugging method with the ideas of. Second major MP3 chip with AT89C51SNl program design process, set out procedures for C51 in single-chip design applications. Title III, focuses on U disk mass storage device system design and debugging of such knowledge.)