简单的51单片机项目，数码管计时器
A simple project based on 51 MCU.
It can keep time for twenty-four hours,and you can adjust the time whenever you want.
It is my sophomore final assignment of 51 SCM Course. Its detailed introduction is in the file with the suffix doc. I hope you can help me perfect this project,and I sincerely hope we can learn from each other.