单片机原理及应用 第1章单片机应用系统概述M、CS—51单片机的硬件结构 第4章单片机程序设计 常用I/O芯片接口技术及简单的I/O接口扩展-Single-chip Microcomputer Principle and Application of Chapter 1 outlines the single-chip microcomputer application systems M, CS-51 Single-chip hardware structure Chapter 4 Single-chip program design commonly used I/O chip interface technology and simple I/O interface expansion