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

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