【正文】 華北水利水電學(xué)院本科生畢業(yè)設(shè)計(jì) —— 基于 STC89C52RC 的電子時(shí)鐘設(shè)計(jì) ~ 2 ~ Abstract At the late 20th century, for the rapid development of electronic technology, modern electronic products seeped almost all areas of society, and powerfully impelled the development of the social productive force and the enhancement of the social informationization degree, simultaneously also made the modern electronic products’ performance further to enhance, and its’ renewal rhythm be more and more quick. The electronic clock ,as essential goods in people’s daily life,is widely used for personal family as well as stations, terminals, theaters, offices and other public places, it brings enormous convenient for our life, study, work and the development of modern digital integrated circuit technology and the adoption of advanced quartz technology, electronic clocks bee accurate and stable, also its’ integrated circuits bee a small size, low power consumption, multifunctional, and Portable, so in many electronic devices they are also widely used. The electronic clock in fact is useing electronic technology to make the clock bee electronic and digital . This design will mainly take the STC89C52RC chip as the control core to make a clock from which wo can nomally get information of the year, month, date, week, hour, minute, second and also we can adjust the time whenever we need. Finally i selecti LCD1602 as the display device, with the DS1302 realtime chip we can plete the the basic functions of clock and calendar,. This method provides the advantage that the circuit is simple, stable, 華北水利水電學(xué)院本科生畢業(yè)設(shè)計(jì) —— 基于 STC89C52RC 的電子時(shí)鐘設(shè)計(jì) ~ 3 ~ realtime, accurate an, easyoperated and easyprogrammed. The electronic clock can be applied to general life and work, also can be modified to improve performance, add new features, so that can bring more convenience to people39。s lives and work . Key words: Electronic technology, electronic clock, STC89C52RC, DS1302, LCD1602 華北水利水電學(xué)院本科生畢業(yè)設(shè)計(jì) —— 基于 STC89C52RC 的電子時(shí)鐘設(shè)計(jì) ~ 4 ~ 目錄 摘要 ................................................................................................................................................. 1 Abstract .......................................................................................................................................... 2 前言 ................................................................................................................................................. 6 第 1 章 系統(tǒng)方案選擇與論證 ....................................................................................................... 7 系統(tǒng)設(shè)計(jì)要求 .................................................................................................................. 7 系統(tǒng) 總體設(shè)計(jì)結(jié)構(gòu)框圖及 工作基本流程 ...................................................................... 7 系統(tǒng)基本方案選擇和論證 .............................................................................................. 8 時(shí)鐘模 塊方案 ....................................................................................................... 8 顯示模塊方案 ....................................................................................................... 8 按鍵模塊方案 ....................................................................................................... 9 電源模塊方案 ....................................................................................................... 9 系統(tǒng)各模塊的最終選擇方案 ........................................................................................ 10 第 2 章 系統(tǒng)的硬件設(shè)計(jì)與實(shí)現(xiàn) ................................................................................................. 11 系統(tǒng)硬件簡(jiǎn)介 ................................................................................................................ 11 單片機(jī) STC89C52RC......................................................................................... 11 DS1302 實(shí)時(shí)時(shí)鐘芯片 ..................................................................................... 13 LCD1602 液晶顯示屏 ...................................................................................... 14 7805 穩(wěn)壓芯片 .................................................................................................. 15 系統(tǒng)主要單元電路的設(shè)計(jì) ............................................................................................ 16 主控模塊 ............................................................................................................. 16 DS1302 時(shí)鐘模塊 ............................................................................................. 17 LCD1602 液晶顯示模塊 .................................................................................. 18 按鍵模塊 ............................................................................................................. 19 電源模塊 ............................................................................................................. 19 系統(tǒng)整體電路的設(shè)計(jì) .................................................................................................... 19 電子線路原理圖設(shè)計(jì) ......................................................................................... 19 電子線路 PCB 布置圖設(shè)計(jì) ............................................................................... 22 第 3 章 系統(tǒng)的軟件設(shè)計(jì) ............................................................................................................. 25 系統(tǒng)軟件設(shè)計(jì)思路 ........................................................................................................ 26 系統(tǒng)程序設(shè)計(jì) ................................................................................................................ 26 全局定義 ............................................................................................................. 27 系統(tǒng)主程序 ......................................................................................................... 29 調(diào)時(shí)子程