目 錄
摘要······································································································Ⅰ
Abstract ·································································································Ⅱ
第一章 緒論····························································································6
　　1. 1 課題背景····················································································6
　　1. 2 本文所做的主要工作·····································································7
第二章 系統(tǒng)方案設(shè)計及主控芯片介紹 ·························································8
　　2. 1主體方案·····················································································8
2. 1 電子琴的總體框圖········································································8
　　2．2 主控芯片AT89C51的結(jié)構(gòu)與原理····················································10
　　　　2.2.1 AT89C51單片機的結(jié)構(gòu)·························································10
　　　　2.2.2 AT89C51單片機的工作原理 ··················································15
第三章 硬件電路設(shè)計···············································································17
　　3. 1發(fā)聲電路····················································································17
　　3. 2 數(shù)碼管顯示電路··········································································19
　　3. 3 電源電路設(shè)計·············································································20
　　3．4 鍵盤設(shè)計···················································································21
第四章 樂曲聲音算法···············································································23
　　4．1音樂頻率的實現(xiàn)···········································································23
　　4．2音樂節(jié)拍的實現(xiàn)···········································································24
第五章 系統(tǒng)軟件設(shè)計···············································································28
　　5．1系統(tǒng)程序流程··············································································28
　　5．2 鍵盤掃描程序流程圖···································································29
總結(jié) ····································································································30
致謝 ····································································································31
參考文獻 ······························································································32
附錄1 ··································································································33
程序·····································································································34