电子实时时钟系统
1）设计一个可以显示1234的显示电路，并利用单片机实现。
2）利用按键切换，然后显示I0Y
3）按键切换的动作，全部用串口进行通信。
设计一个开关，当进行切换后，程序再进入主要要求。
主模块要求：
(1) 显示准确的北京时间（时、分），可用24小时制式；
(2) 随时可以调校时间。
(3) 增加公历日期显示功能（月、日）；
(4) 随时可以调校月、日；
(5) 允许通过转换功能键转换显示时间或日期。
(6) 所有按键需要通过串口自发自收来调校各种功能
Electronic real-time clock system
1) Design a show 1234 show circuit, which uses MCU.
2) Using button to switch, and then show I0Y
3) Action Key switching, all communication with the serial port.
Design a switch, when the switch, the program re-entering the main requirements.
Main module requires:
(1) display accurate GMT (hours, minutes), available 24 hours format
(2) can be adjusted at any time.
(3) increase the Gregorian calendar display (month, day)
(4) you can always adjust the month, day
(5) allows conversion function keys switch the display time or date.
(6) All keys through the serial port to adjust a variety of spontaneous self-closing function (2015-07-18, Windows_Unix, 11KB, 下载4次)
用65536HZ的频率作为系统的时钟，对其进行分频产生秒信号，再对秒信号进行计数，产生分、时，并显示小时和分钟的实际值（对秒的显示不作要求）。
2、能预置小时和分钟的功能（即校时、校分）。
3、显示可采用静态数码管显示，也可用动态显示。（若用动态显示，则可同时将时分秒显示出来。）
65536HZ used as the frequency of the system clock, its frequency signal generated seconds. another signal of seconds count, have hours, and display the hours and minutes of the actual value (the second show is not for requirements). 2, can be deployed in hours and minutes functions (ie school, the school). 3 shows that use of digital static, dynamic display is also available. (If using dynamic display, and can also be displayed at the minute and second.) (2006-12-20, Windows_Unix, 167KB, 下载6次)