Basic requirements: Select the clock chip in the LED digital tube display the date and time switch (LED display format for 4 years 2 months 2 day), but also realize the use of LCD (display format for the × × × × × × month × year × × × day when: × × points: × × seconds). Realize the use of multiple keys settings, modify the date and time saving (off display) and other functions, the keyboard function of self-definition. Additional requirement: the realization of an alarm clock function (custom ringtones).

数字时钟1.doc

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