用c语言编写的数字时钟，有时分秒显示，并且时分秒都可调，误差较小。用AT89C51单片机连接数码管显示，程序用keil编写，实验仿真有protel99se实现，已验证成功-With the c language of the digital clock, sometimes minutes and seconds display, and when the minutes and seconds are adjustable, error smaller. AT89C51 microcontro