毕业论文--基于单片机的多功能电子钟毕业设计.docVIP

摘 要 关键词：；；； Abstract The electronic clock mainly uses the electronic technology make the clock computerization, the digitization, with the clock precision, small size, friendly interface, scalable performance and other characteristics, was widely used in life and work. Measuring temperature, in life, industry and agricultural production, so electronic clock need multi-function. The design for the main implementing a clock/calendar can be displayed normal, collecting personal ambient temperature, with the timing alarm of the multi-function electronic clock. Comparing and analysising the development technology of the electron clock, the design determines to use the MCU technology to realize the multi-functional electron clock. This design application AT89C51 as a core chips, 7 LED digital displaying, using DS1302 real-time clock chip to complete the basic function of the clock/calendar. At the same time the design use of DS18B20 temperature sensors to collect the environmental temperature. The method has the advantage of being simple circuit, reliable performance, good real-time, high precision of the time and temperature , simply operation, easy programming. The electronic clock can be applied to the general living and working ,can also be modified to improve performance, add new functions, and brings more convenient to people’s life and work. Key words: Electronic clock; Multi-function; AT89C51; DS1302; Temperature pickup 目 录 摘 要 I Abstract II 第一章 引 言 1 1.1 多功能电子时钟研究的背景和意义 1 1.2 电子时钟的功能 2 第二章 电子时钟设计方案分析 3 2.1 FPGA设计方案 3 2.2 NE555时基电路设计方案 3 2.3 单片机设计方案 4 第三章 基于单片机的电子时钟硬件设计 6 3.1 主要IC芯片选择 6 3.1.1 微处理器选择 6 3.1.2.1常用时钟日历芯片比较 7 3.1.2.2 DS1302简介 8 3.1.2.3 DS1302引脚说明 8 3.1.2.4 DS1302的控制字和读写时序说明 9 3.2.1.5 DS1302的片内寄存器 11 3.1.2 环境温度传感器选择 13 3.1.3.1 常用温度传感器比较 13 3.1.3.2 DS18B20简介 14 3.1.3.2 DS18B20内部结构 15 3.2 电子时钟硬件电路设计 16 3.2.1 时钟电路设计 17 3.2.2 环境温度采集电路设计 18 3.2.3 显示电路 19 3.2.4 按键电路设计 20 3.2.5 闹铃电路设计 22 3.2.6 复位电路设计 23 第四章 电子时钟软件设计 25 4.1 主程序设计 25 4.2 子程序设计 26 4.2.1 实时时钟