毕业论文-基于单片机at89c51的简易电子琴系统

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1、四川职科技业技术学院毕业设计（论文）（专科2012届）院（系）：移动通信与软件学院课题:基于单片机的简易电子琴专业：电子信息工程技术班级：电信1班学生姓名：宁莎指导老师：学号：201201010121日期：20年月日2目录摘要······································································································ⅠAbstract·············································

2、····················································Ⅱ第一章绪论····························································································61.1课题背景····················································································61.2本文所做的主要工作··············

3、·······················································7第二章系统方案设计及主控芯片介绍·························································82.1主体方案·····················································································82.1电子琴的总体框图···································

4、·····································82．2主控芯片AT89C51的结构与原理····················································102.2.1AT89C51单片机的结构·························································102.2.2AT89C51单片机的工作原理··················································15第三章硬件电路设

5、计···············································································173.1发声电路····················································································173.2数码管显示电路··········································································193.3电源电路设

6、计·············································································203．4键盘设计···················································································21第四章乐曲声音算法···············································································234．1音乐频率

7、的实现···········································································234．2音乐节拍的实现···········································································24第五章系统软件设计···············································································285．1系统程序流程···

8、···········································································285．2键盘扫描程序流程图····························