室外倒计时系统的设计与实现

Design and construct of the outdoor inverse chronograph system

基于AT89C51单片机的室外倒计时系统的设计方法和原理,重点阐述了时钟和点阵式LED显示电路设计的关键技术.该倒计时系统由适时时钟芯片、中央处理单元、译码、驱动、显示、键盘等几部分电路构成.能够使显示屏显示当前日期距离设定日期的天数,同时实现对当前日期、时、分、秒等数字的显示功能.显示屏的字符清晰,系统工作稳定.

This article introduced the method and principle of the outdoor inverse chronograph system which is based on the AT89C51 and especially state the key technology on the design of the clock and dot-matrix LED displaying dircuit.This system is composed of the RTC,the CPU,the decode,the driver,the display and the deyboard It can display the numbers of the day between the current day and the setted date,and also can display the numbers of the day between the current day and the setted date, also can display the current date, hour, minute and second.The character string being displayed clearly and the system working stably.