说明：  基于S3C2440的RTC实时时钟显示实验作为对前段时间学习ARM的总结，写个这个基于S3C2440的RTC实时时钟显示程序，主要涉及到串口中断，外部中断，节拍中断，LCD显示,LCD字符显示，RTC操作等等一些内容，经实验，程序显示正常，达到了预期的效果，学习，参考。
(S3C2440-based RTC real time clock display experiment as a summary of earlier learning ARM, write the S3C2440-based RTC real time clock display program, mainly related to the serial port interrupt, external interrupt, tick interrupt, LCD display, LCD character display, RTC operation so some of the content, the experiment, the program displays the normal, to achieve the desired results, learning and reference.)