基于单片机的计算器的设计毕设论文定稿重改.doc

基于单片机的计算器的设计 中 文 摘 要 近些年来随着计算机在社会领域的渗透和大规模集成电路的发展，单片机的应用正在不断地走向深入，由于它具有功能强、体积小、功耗低、价格便宜、工作可靠、使用方便等特点，因此特别适合于与控制有关的系统，越来越广泛地应用于自动控制，智能化仪器，数据采集以及家用电器等各个领域。 计算器这一小小的程序机器实际上是从计算机中割裂出来的衍生品，但因其方便快捷的操作模式，已经被广泛应用于商业等日常生活中，极大的方便了人们对于数字的整合运算。 计算器一般由运算器、控制器、存储器、键盘、显示器、电源等设备组成。键盘是计算器的输入部件，一般采用接触式或传感式。显示器是计算器的输出部件，有发光二极管显示器或液晶显示器等。除显示计算结果外，还常有溢出指示、错误指示等，部分计算器还带有时钟功能。 关键词：单片机；控制系统；计算器；多功能 Calculator Design Based on Single-chip ABSTRACT In recent years, as computer penetration in the social field and large-scale development of integrated circuits, micro controller applications are continually deepening, because of its powerful function, small size, low power consumption, cheap, reliable, easy to use, etc. Therefore particularly suitable for systems with control of more and more widely used in automatic control, intelligent instruments, data acquisition, military products and home appliances fields. This little Calculator program was actually cut out from the computers of derivatives, but the derivatives for its quick and convenient operation mode, has been widely used in daily life, such as business, great convenience for the integration of the people digital computation. Calculator generally be constitute of logic, controller, storage, keyboard, display, power composition. The keyboard is calculator input parts, generally uses the contact or sensing type. Display is the calculator output components, have LED display or LCD etc. In addition to displaying calculation results, overflow indicator and error indicates can be shown, some calculator also with clock function. KEY WORD: single chip；control system；calculator；multifunctional 目录 1绪论 1 1.1问题的提出 1 1.2国内外研究现状 1 1.3设计目标 2 1.3.1设计目的 2 1.3.2系统功能 2 2系统方案选择 3 2.1硬件部分 3 2.1.1 单片机型号的选择 3 2.1.2 按键的选择 3 2.1.3 显示器的选择 4 2.1.4 时钟芯片的选择 4 2.1.5 电源的选择 4 2.2软件部分 4 2.3系统方案概述 5 3系统组成 6 3.1单片机STC89C52 6 3.2液晶显示屏LCD1602 9 3.3时钟芯片DS1302 10 3.4锂二氧化锰电池CR2032 10 4硬件电路设计 11 4.1总体设计 11 4.2硬件电路设计 11 4.2.1单片机时钟电路的设计 11 4.2.2单片机复位电路的设计 12 4.2.3按键电路的设计