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本设计论文介绍了应用STC90C516RD+单片机作为主控芯片的智能数字钟的软、硬件设计，给出了C语言源程序。此数字钟可以将时间、日期、温度、重大节日等显示于液晶屏上。它采用24时计时法，另外设有校时功能，可以调整其时间。电路由控制芯片CPU、时钟信号发生模块、显示模块、温度检测模块及时钟调整电路组成。运用时钟芯片产生标准时钟信号，从时钟芯片直接读出时间、日期等数据，分别经处理后送显示模块。选用LCD液晶屏作为显示器件，显示出清晰、直观的数字符号与汉字。由于时钟芯片长时间工作会产生误差，在电路中设计有时钟调整电路，方便校时。
关键词：单片机；STC90C516RD+；数字钟；LCD
Abstract
This paper introduces the application of STC90C516RD+ microcontroller as the main control chip of the intelligent digital clock software, hardware design, gives the C language source code. The digital clock can display the time, date, temperature, major festivals, etc. on the LCD screen. It uses 24 time method, in addition with the school function, you can adjust the time. The circuit is composed of a control chip CPU, a clock signal generating module, a display module, a temperature detection module and a clock adjusting circuit. Use the clock chip to produce the standard clock signal, from clock chip directly read time and date data, respectively the evacuation display module. LCD screen as a display device, showing a clear, intuitive digital symbols and Chinese characters. Due to the clock chip long time work will produce error, in the circuit design of the clock circuit, the convenience of school.
Key words：Single-chip microcomputer; STC90C516RD+; Digital clock; LCD
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