基于单片机控制LCD显示电子时钟设计.doc

基于单片机?控制LCD?显示电子时?钟设计 摘要 本设计使用?11.0592M?HZ晶振与?单片机AT?89C52?相连接，以AT89?C52芯片?为核心，采用160?2的并行操?作方式显示?。通过使用该?单片机，实现把时间?和温度显示?在1602?液晶上，并且按秒实?时更新。STC89?C52单片?机是由深圳?宏晶科技公?司推出的，功耗小，电压可选用?4～6V电压供?电。通过板子上?的按键可随?时调节时钟?的年、月、日、星期、时、分、秒，按键设计3?个有效按键?，分别有功能?选择键、数值增大键?、数值减小键?。在每次的按?键按下时，蜂鸣器有“滴”的提示声。再利用DS?12887?设计实现断?电自动保护?显示数字的?功能，当下次上电?时会接着上?次上电前的?时间继续运?行。本设计的+5V电源采?用LM11?17电压转?换元件，将电源适配?器转换得到?的12V电?压直接变成?5V电压供?系统使用。通过软硬件?结合达到最?终目的。 关键词: 单片机AT?89C52?;1602液?晶;电子时钟;DS128?87芯片 Abstr?act The desig?n uses a 11.0592M?Hz cryst?al with AT89C?52 micro?contr?oller? is conne?cted to the AT89C?52 chip as the core, and 1602 paral?lel opera?tion. By using? the micro?contr?oller?, the time is displ?ayed in 1602, and updat?ed in real time in secon?ds. STC89?C52 micro?contr?oller? is launc?hed by the Shenz?hen-Hong Cryst?al Techn?ology?, Inc., low power? consu?mptio?n, volta?ge can be used to 6V volta?ge power? suppl?y. Throu?gh the keys on the board? can alway?s adjus?t the clock? of the year, month?, day, week, when, minut?es, secon?ds, butto?n desig?n 3 effec?tive keys, funct?ion selec?tion key, incre?ase the value? of the key, key decre?ases the value?. Each time the butto?n is press?ed, the buzze?r tone drop. Re-use the DS128?87 desig?n power?-off autom?atica?lly to prote?ct the displ?ay numbe?r, then the last time befor?e the power? to conti?nue runni?ng when the next power?. The desig?n of the 5V power? suppl?y using? LM111?7 volta?ge conve?rsion? devic?e, power? adapt?er conve?rted direc?tly into 12V volta?ge 5V volta?ge for syste?m use. Throu?gh a combi?natio?n of hardw?are and softw?are to achie?ve the ultim?ate objec?tive. Keywo?rds: Micro?contr?oller? AT89C?52;1602 LCD;Elect?ronic? clock?;DS128?87chi?p 目录 TOC \o 1-3 \h \z \u HYPER?LINK \l _Toc3?57549?439 第1章 绪论 PAGER?EF _Toc3?57549?439 \h 1 HYPER?LINK \l _Toc3?57549?440 1.1 电子时钟的?研究背景 PAGER?EF _Toc3?57549?440 \h 1 HYPER?LINK \l _Toc3?57549?441 1.2 电子时钟的?国内外研究?现状 PAGER?EF _Toc3?57549?441 \h 1 HYPER?LINK \l _Toc3?57549?442 第2章 设