文档介绍：摘要
近年来,随着单片机档次的不断提高,功能的不断完善,其应用日趋成熟,应用领域日趋扩大,特别是工业测控、。虽然篮球比赛计时器电路功能比较简单,但是设计它的意义在于能使学生将所学到的知识综合应用,提高动手实践能力.
本电路主要由五个模块构成:秒脉冲发生器、计数器、译码显示电路、控制电路和报警电路。七段共阴LED 数码管构成计时显示电路, 具有计时器直控制电路直接控制计数器启动计数、暂停/连续计数、译码显示电路的显示等功能。当控制电路的置数开关闭合时,在数码管上显示数字24,每当一个秒脉信号输入到计数器时,数码管上的数字就会自动减1,当计时器递减到零时,报警电路发出光电报警信号。
关键词: 单片机AT89C51 共阴极LED数码显示器显示电路控制电路报警电路
Abstract
Summary in recent years, as single tablets machine grade of constantly improve, function of constantly perfect, its application increasingly mature, application area increasingly expanded, especially industrial measurement and control, and tip weapons and daily appliances, area more is because has has single tablets machine and health fai colour. single tablets machine technology has became a items new of engineering technology. This graduated design is to AT89S51 single tablets machine for Center design of petition timing device. While the timer circuit features the basketball game is relatively simple, but its significance is designed to enable students to learn the knowledge ofintegrated applications, enhance the hands-on ability.
This circuit is mainly made up of five modules: pulse generators, counters, display decoding circuit, control circuit and alarm circuits. Constitute a time of seven Yam LED digital tube display circuits, direct control with timer control circuit, pause/continuous counter starts counting features such as display of the count, display decoding circuit. When the number of the reset control circuit when the switch is closed, in the digital displays on Digital 24, whenever the pulse input signal to a second counter, digital Canal Digital isautomatically reduced on 1, when the timer decrements to 0 o'clock, alarm circuit of optical alarm signal was issued.
Key words: AT89S51 single-chip puter Altogether cathode LED digital display display decoding circuit control circuit alarm circuit
目录
第一章绪论 1
课题背景 1