51系列单片机教学实验板硬件设计

51系列单片机教学实验板硬件设计

摘要

开发调试工具。

它与传统的教学实验板相比有如下的优点：（1）价格低廉。（2）使用简单方便，只要有带RS232串口的PC机就能进行实验。（3）功能全，基本上具备单片机常用的接口，如数模转换、模数转换、存储器、LED数码管显示、键盘人机接口、并行接口、串行接口，等等。

采用本仿真开发实验板，可使初学者迅速掌握单片机原理及应用，熟悉汇编语言、甚至单片机C语言。用本仿真开发实验板，对用户源程序进行实时在线调试，可极大地缩短单片机应用系统的开发时间。

关键词:单片机;实验板；接口电路；汇编语言

51系列单片机教学实验板既是一块用户实验板，又是一种功能强大而实用的单片机

The hardware designed of 51 serial single chip processor

teaching experiment board

ABSTRACT

51 serial single chip processor teaching experiment board is a user experiment board, and also a powerful and practical single chip processor develop and debug tools.

Compared with traditional teaching experiment board it has following advantages :( 1) Cheap. (2) It is simple and convenient to use , so long as can carry on the experiment with a PC with RS232. ( 3) With complete function, possess the common user interface of the basic single chip processor, the ADC block, the DAC block, the memory , HID(Human Interface Device, such as the

LED and the key board) , parallel interface, serial interface , and so on.

With this experiment board, the beginners can easily to grasp the principle and application of the MCU,be familiar with assemble languages , even the C51 languages. The character of on system debug can shorten the time to study Develop experiment board with emulation this, carry on to user source program real-time to debug online, can shorten construction period of the application system of the single chip processor greatly.

Key words: single chip processor; experiment board; interface; assemble languages

目 录

中文摘要 英文摘要

0前言．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．1 1硬件电路设计．．．．．．．．．．．．．．．．．．．．．．．．．．2 1.1 仿真实验板的概

况．．．．．．．．．．．．．．．．．．．．．．．2

1.2 仿真实验板的资源．．．．．．．．．．．．．．．．．．．．．．．2 1.3 电路原理图说明 ．．．．．．．．．．．．．．．．．．．．．．．4 1.3.1单片机最小系统的电路说明 ．．．．．．．．．．．．．．．．．．4 1.3.2 模数转换器ADC0809的接口电路．．．．．．．．．．．．．．．．6 1.3.3 数模转换器DAC0832的接口电路．．．．．．．．．．．．．．．．7 1.3.4 并行接口芯片8255A的接口电路．．．．．．．．．．．．．．．．8 1.3.5 数据/程序存储器

HM62256．．．．．．．．．．．．．．．．．．． 9 1.3.6 动态LED显示与键

盘．．．．．．．．．．．．．．．．．．．．．10

1.3.7 蜂鸣器驱动电路．．．．．．．．．．．．．．．．．．．．．．13 1.3.8 电

源．．．．．．．．．．．．．．．．．．．．．．．．．．．．13 1.3.9 RS-232串行接

口．．．．．．．．．．．．．．．．．．．．．．．14

1

2软件电路设计．．．．．．．．．．．．．．．．．．．．．．．．．17 2.1 汇编由语言程序设计步骤．．．．．．．．．．．．．．．．．．．17 2.2 软件实验．．．．．．．．．．．．．．．．．．．．．．．．．．17 2.2.1 内外存储器清零．．．．．．．．．．．．．．．．．．．．．．18 2.2.2 二进制转换BCD码以及BCD码求和、相减．．．．．．．．．．．．19 2.2.3 二进制转换成

ASCII．．．．．．．．．．．．．．．．．．．．．．．20 2.2.4 内存块移

动．．．．．．．．．．．．．．．．．．．．．．．．．21

2.2.5数据排序．．．．．．．．．．．．．．．．．．．．．．．．．．23 2.2.6 程序跳转表．．．．．．．．．．．．．．．．．．．．．．．．25 2.2.7 延时程序．．．．．．．．．．．．．．．．．．．．．．．．．26 2.3 硬件实验．．．．．．．．．．．．．．．．．．．．．．．．．．27 2.3.1 外部存储器控制信号检测以及读写实验．．．．．．．．．．．．27 2.3.2 D/A转换实验．．．．．．．．．．．．．．．．．．．．．．．28 2.3.3 A/D转换实

验．．．．．．．．．．．．．．．．．．．．．．．．32

2.3.4 定时器实验．．．．．．．．．．．．．．．．．．．．．．．．33 2.3.5 8255A输入输出实验．．．．．．．．．．．．．．．．．．．． 36 2.3.6 键盘扫描显示实验．．．．．．．．．．．．．．．．．．．．．38 总结．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．46

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