基于单片机的简易计算器的设计

本文ID：67217

论文字数:17690

论文编号:JD1198 论文字数:17690

基于单片机的简易计算器的设计

摘要：本文叙述了一种基于单片机的简易计算器的设计过程。该设计采用C语言编写简易计算器的加、减、乘、除基本运算程序。通过单片机、键盘数码管驱动芯片HD7279A、数码管以及相应按键的组合来实现上述功能。该系统在计算器基本运算功能实现的基础上，对计算器的记忆功能和计算精度进行了拓展，最终使计算器计算位数达到8位，计算精度达到小数点后2位。

关键词：计算器；单片机；数码管；键盘；驱动芯片

The Design of the Simplified Calculator Based on Single-chip Computer

Abstract：This article expatiates the process of one design of the simplified calculator based on single-chip computer. The program of the addition , subtraction, multiplication and division defined as the basic function of simplified calculator is written by C language . The above functions are realized by the combination of the single-chip computer, digital tube & keyboard driver chip HD7279A , digital tube and correspond key. Based on the realizing of the basic function of the simplified calculator, the system was developed on the funtions of saving result and advancing precision. The number of digit bit in this system reaches 8，while the compute precision reaches two decimal palces.

Keywords：calculator；single-chip computer；digital tube；keyboard；driver chip

前言....1

第 1 章系统整体设计...2
1.1 设计要求..2
1.2 总体方案设计.2
1.3 方案的论证.3

第 2 章系统硬件设计..4
2.1 单片机..4
2.1.1单片机的选择..4
2.1.2 STC89C52介绍5
2.2 键盘、显示驱动6
2.2.1 驱动元件的选择.6
2.2.2 HD7279A智能驱动芯片..7
2.3 晶振电路11
2.4 复位电路...13
2.5 去耦电容电路..15
2.6 显示电路...16
2.7 键盘电路...18

第 3 章系统软件设计21
3.1 系统软件主流程..21
3.2 程序编写语言选择.23
3.3 软件子函数设计..23
3.3.1发送子函数.24
3.3.2接收子函数.24
3.3.3 BCD拆分子函数.25

第 4 章系统的调试与分析.26
4.1 硬件调试...26
4.2 软件调试...27

结束语..30
参考文献..31
致谢32
附录33
附录1：电路原理图33
附录2：源程序.33
附录3：英文参考文献及其中文翻译48