毕业设计（论文）-基于单片机的多功能电子钟的设计与实现.doc

摘 要
基于51单片机可校时数字时钟电路设计,单片机计算机即单片微型计算机。(Single-Chip puter )是集CPU ,RAM ,ROM ,计数和多种接口于一体的微控制器。
石英晶体振荡器是高精度的计时工具,而电子钟,石英表,石英钟都采用了石英技术,因此计时精度高,稳定性好,使用方便,不需要经常调校。而数字式电子钟用集成电路计时时,译码代替机械式传动,用LED显示器代替指针显示进而显示时间,减小了计时误差,这种表具有时,分,秒显示时间的功能,还可以进行时和分的校对,片选的灵活性好。本文利用单片机实现数字时钟计时功能的主要内容,其中AT89S52是核心元件同时采用数码管动态显示“时”,“分”,“秒”的现代计时装置。与传统机械表相比,它具有走时精确,显示直观等特点。它的计时周期为24小时,显满刻度为“23时59分59秒”,另外具有校时功能,断电后有记忆功能,恢复供电时可实现计时同步等特点。
本设计由单片机AT89S52芯片和LED数码管为核心,辅以必要的电路,构成了一个单片机数字时钟。
关键词:单片机;数字时钟;LED数码管显示;按键
Abstract
The base and 51 digital clock when the microcontroller can be the school circuit design, single-puter that is single-chip puter. (Single-Chip puter) is a CPU, RAM, ROM, counting and multiple interfaces in one microcontroller.
Quartz crystal oscillator is a high-precision timing tools, electronic clock, quartz watch, quartz is used quartz technology, high precision timing, good stability, easy to use, does not require frequent adjustment. The digital electronic clock with the time integrated circuits, the decoding instead of mechanical transmission, with LED display instead of a pointer display and then display the time and reduce the timing error, this table has the hours, minutes and seconds displays the time function, but also in progress and sub-proof-reading, the flexibility of a good chip select. In this paper, MCU function digital clock timing the main contents of which AT89S52 is a core element at the same time the use of digital control dynamic display "time", "sub", "second" modern timing devices. Compared with the traditional mechanical watch, it has a travel-time accuracy, display and intuitive and so on. It is a time period of 24 hours, substantially full-scale as "23:59:59", another time with a school function, memory function after power outages, power restoration can be realized when the time synchronization and so on.
The design by the MCU AT89S52 chip and LED digital tube as the core, supplemented by the necessary circuitry to form a single chip digital clock.
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