摘 要单片机最小系统，无论对单片机初学人员还是开发人员都具有十分重要的意义，初学人员可以利用最小系统逐渐了解单片机的设计原理与功能，开发人员可以进行编程实现工业控制。单片机最小系统电路板在单片机开发市场和大学生电子设计方面十分流行，设计单片机最小系统电路板，能够让设计者迅速掌握单片机应用的技术特点与实际要求。印制电路板技术正在飞速进展，在各个领域得到了广泛应用。本次设计以此为出发点，结合单片机最小系统的基本原理，以 STC89C51 为核心，在 Protel 99SE 平台下从对电路进行设计，并在 Protel 99 SE 平台下对单片机最小系统进行了详细的原理图设计以及 PCB 设计。首先根据电路原理从 AD、DA、复位、晶振几个模块对电路进行设计，最后综合所有模块进行 PCB 设计，并介绍了 PCB 设计的参数设置，布线规则。利用 PROTEL 电路设计软件进行原理图设计，PCB 布线，借此巩固单片机应用、模拟电路、数字电路课程及学会工程软件 PROTEL 的使用。关键字：PROTEL 99SE；印制电路板；最小系统；STC89C51AbstractMCU minimum system, it’s of great significance for both MCU beginner or developer. Beginners can take advantage of getting to know the minimum system design principles and function of MCU，developers can use minimum system to program for industrial control. MCU minimum system board are very popular in the MCU develop market and college students electronic design. Design of MCU, allowing designers to quickly grasp the technical characteristics of MCU application and the actual requirements. Printed circuit board technology is developing by leaps and bounds, it has got the extensive application in various fields. This design set it as a starting point, combining the basic principles of MCU minimum system, to the core of STC89C51, we design the circuit In Protel 99SE platform, meanwhile we give the circuit a detailed schematic design and PCB design In Protel 99SE platform. First, we design the circuit from the AD, DA, reset, crystal oscillator of s...
