目录TOC\o"1-3"\h\z\uHYPERLINK\l"_Toc383173624"1引言PAGEREF_Toc383173624\h2HYPERLINK\l"_Toc383173625"1.1目的和意义PAGEREF_Toc383173625\h2HYPERLINK\l"_Toc383173626"1.2研究概况及发展趋势综述PAGEREF_Toc383173626\h3HYPERLINK\l"_Toc383173627"1.3本系统主要研究内容PAGEREF_Toc383173627\h4HYPERLINK\l"_Toc383173628"2.总体方案论证与设计PAGEREF_Toc383173628\h5HYPERLINK\l"_Toc383173629"2.1主控模块的选型和论证PAGEREF_Toc383173629\h5HYPERLINK\l"_Toc383173630"2.2显示模块的选型和论证PAGEREF_Toc383173630\h5HYPERLINK\l"_Toc383173631"2.3传感器的选型和论证PAGEREF_Toc383173631\h5HYPERLINK\l"_Toc383173632"2.4时钟芯片的选型和论证PAGEREF_Toc383173632\h6HYPERLINK\l"_Toc383173633"2.5系统整体设计概述PAGEREF_Toc383173633\h6HYPERLINK\l"_Toc383173634"3.系统硬件电路设计PAGEREF_Toc383173634\h7HYPERLINK\l"_Toc383173635"3.1主控模块PAGEREF_Toc383173635\h7HYPERLINK\l"_Toc383173636"3.1.1STC89C52单片机主要特性PAGEREF_Toc383173636\h7HYPERLINK\l"_Toc383173637"3.1.2STC89C52单片机的中断系统PAGEREF_Toc383173637\h10HYPERLINK\l"_Toc383173638"3.1.3单片机最小系统设计PAGEREF_Toc383173638\h10HYPERLINK\l"_Toc383173639"3.2LCD液晶显示器简介PAGEREF_Toc383173639\h10HYPERLINK\l"_Toc383173640"3.2.1液晶原理介绍PAGEREF_Toc383173640\h10HYPERLINK\l"_Toc383173641"3.2.2液晶模块简介PAGEREF_Toc383173641\h11HYPERLINK\l"_Toc383173642"3.2.3液晶显示部分与STC89C52的接口PAGEREF_Toc383173642\h12HYPERLINK\l"_Toc383173643"3.3键盘模块设计PAGEREF_Toc383173643\h12HYPERLINK\l"_Toc383173644"3.4蜂鸣器模块设计PAGEREF_Toc383173644\h13HYPERLINK\l"_Toc383173645"3.5信号采集电路设计PAGEREF_Toc383173645\h13HYPERLINK\l"_Toc383173646"3.5.1传感器简介PAGEREF_Toc383173646\h13HYPERLINK\l"_Toc383173647"3.5.2放大电路PAGEREF_Toc383173647\h14HYPERLINK\l"_Toc383173648"3.5.3整形电路PAGEREF_Toc383173648\h14HYPERLINK\l"_Toc383173649"3.5时钟模块的设计PAGEREF_Toc383173649\h14HYPERLINK\l"_Toc383173650"3.5.1DS1302概述PAGEREF_Toc383173650\h15HYPERLINK\l"_Toc383173651"3.5.2DS1302内部RTC和RAM地址分配PAGEREF_Toc383173651\h17HYPERLINK\l"_Toc383