日历和实时时钟：

1，时-分-秒（2位-2位-2位）显示

可通过键盘置入时间值。

2，可通过按键控制在LED上从右向左滚动显示年_月_日3次，

3，实现每日闹铃提醒功能，闹铃时间可用按键设置。闹铃采用提示音表示。

4，实现秒表功能。-Calendar and real-time clock: 1, time- minutes- seconds (2-2-2 bit bit) display the time value can be placed via the keyboard. 2, can be controlled via buttons on the LED scroll from right to left on _ day of _ 3, 3, to achieve a daily reminder alarm feature, set the alarm time can be key. Said with a tone alarm. 4, to achieve a stopwatch function.