实用数字万年历设计:该系统的设计电路是以 AT89S52 单片机为核心控制器，其外围电路主要包括时钟模块，键盘模块，液晶模块， 闹钟模块和与PC 机通信模块等。这种电子时钟不仅具有了一般电子时钟的基本功能，并且具有以下功能：闹 钟时间设置，闹钟音乐选择，显示年月日与星期，显示农历，通过PC 机在Internet 上同步时间,与PC 通信时 PC 机上会显示友好界面等一系列功能。整个系统使用单片机C51 语言进行编程，PC 机上的通信界面有VB 编 程，实现其设计的各种功能。(Practical digital calendar design: design the circuit of the system is based on AT89S52 microcontroller as the core controller, the peripheral circuit mainly consists of the clock module, keyboard module, LCD module, alarm module and PC communication module and etc.. This electronic clock not only has the basic functions of electronic clock, and has the following functions: set the alarm time, the alarm clock music selection, display date and week display, the lunar new year, through the PC machine on the Internet time synchronization, PC communication with the PC machine will display a friendly interface and a series of functions. The whole system uses single chip C51 language to program, and the communication interface of PC has VB programming to realize various functions of its design.)