湖南电子科技职业技术学院毕业设计摘要现在人们常使用的收音机为手动调频收台，使用较为麻烦，而且由于接收灵敏度不高，所接收的频段较窄。TEA5767具有高性能的RFAGC电路，其接收灵敏度高、参考频率选择灵活、可实现自动搜台。本课题采用STC89C52单片机和TEA5767为核心器件，用I2C通信方式联接单片机与TEA5767，实现数字FM收音机系统。通过编写软件利用单片机控制TEA5767实现手动活自动调频，收到的信号通过TAD2030功放器件放大后，再用扬声器输出信号。在调频的过程中可以通过LCD1602液晶显示屏来随时查看信号的频率。关键词：数字调频；STC89C52；TEA5767；TDA2030ⅠABSTRACTNowadayspeopleusuallyusetheradioformanualFMaccept,itismuchtrouble,andbecausetherxsensitivityisnothigh,thefrequencybandreceivedisverynarrow。TEA5767hashigh-performanceRFAGCcircuit,highsensitivityreceiving,referencefrequencyselectionflexibleanditcanbetherealizationofautomaticsearchplatform。SointhisdesigningIwillusetheSTC89C52single-chipmicrocomputerandTEA5767asthecorecomponentsofdigitalFMradiosystemandUsetheI2CcommunicationtoconnectbetweenSTC89C52andTEA5767chip。ThroughthesoftwarewrittenandusingsinglechipcomputercontrolTEA5767achievemanuallylivetobeautomaticFM,receivedsignalthroughtheTAD2030amplifieramplificationdevice,thenusethespeakeroutputthesignal。IntheprocessofFMthefrequencyofthesignalcanbecheckedbyLCD1602。Keywords：DigitalFM；STC89C52；TEA5767；TAD2030Ⅱ目录摘要∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ⅠABSTRACT∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙Ⅱ绪论∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙1第一章基于单片机的FM收音机工作原理∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙21.1FM收音机的基本工作原理∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙21.2数字调节FM收音机的工作原理∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙21.3用单片机完成数字调节的FM收音机的功能设计∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙3第二章硬件电路设计∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙42.1硬件组成∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙42.1.1数字FM收音机系统控制中心单片机∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙42.1.2收音功放芯片TDA2030∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙52.1.3PT2257音量模块∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙62.1.4FM收音模块∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙72.2FM电路及其设计∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙92.3单片机控制与显示电路∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙102.4供电电路与放大电路∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙11第三章软件设计∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙133.1键盘与显示函数设计∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙133.1.1LCD液晶显示函数∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙133.1.2键盘读键子程序：∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙143.2数字调节与收音控制程序设计∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙153.2.1EA5767HN读写寄存器∙∙∙∙∙∙∙∙