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、液晶显示模块和跑表。这种电子钟不仅具有了一般电子钟的基本功能，并且具有以下功能：闹钟时间设置，显示年月日，跑表,对重要日子倒计时,温度监测等一系列功能。-System design is based on AT89S52 microcontroller core circuit controller, the peripheral circuit includes a clock module, keyboard module, LCD display module and stopwatch. This electronic clock not only has the basic functions of general electronic clock, and has the following features: alarm time set, display month, day, stopwatch, countdown of important dates, temperature monitoring and a series of functions.