摘 要
本设计就是利用Atmel 公司生产的单片机AT89S52芯片和AT24C02芯片（存储芯片），以及利用DS1302用作时钟芯片（具有实时显示当前时间，按设定时间用蜂鸣器报时，能修改当前时钟（闹钟）等功能）。在以单片机为核心的基础上加上其外围设备实现的小的系统——自动打铃系统。所谓的单片机小系统从系统的角度来定义就是完成复杂功能的硬件和软件，并使其紧密耦合在一起的计算机系统。硬件设计部分分别从各个功能电路进行阐述，包括电源电路、复位电路、时钟电路、显示电路，本文来自辣.文,论-文·网原文请找腾讯752018766密码电路。软件部分分成了四个模块：初始化模块、时间显示模块、以及定时打铃模块，密码电路。初始化模块主要是对定时计数器的方式及初值的设定。时间显示模块负责正确的显示当前时间。按键设定模块主要是对时间的校准及设定。定时打铃模块负责到时响铃功能。也就是说系统的功能是由硬件和软件两大部分共同合作完成。
我国物流发展对策探讨与布局的特点 关键字：单片机；存储芯片；时钟芯片。
ABSTRACT
This design is produced by Atmel AT89S52 microcontroller chip and AT24C02 chip (memory chip), and use as a clock chip DS1302 (with real-time display the current time, press the buzzer to set the time with timekeeping, to modify the current clock (alarm) etc.). In a microcontroller core with its peripheral devices based on the realization of the small system - Automatic ring a bell system. The so-called small system microcontroller from the system point of view to define the complex functions that the hardware and software, and tightly coupled to the computer system. Hardware design part of the circuit are described from various functions, including the power supply circuit, reset circuit, clock circuit, display circuit, password circuits. Software part is divided into four modules: initialization module, the time display module, and the regular ringing module, password circuits. Initialization module is the main mode and timer counter initial settings. Responsible for the correct time display module displays the current time. Buttons to set the module is the time of the calibration and settings. Time a bell rings when the module is responsible to the function. That is a function of the system hardware and software work together to complete two parts.
Key word： SCM Memory chips Clock chip
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