基于80c51单片机的多功能电子定时器的设计，用c语言编译，不错的程序-80c51 microcontroller-based multifunction electronic timer design, c compiler, good procedures

多功能电子时钟设计，可以秒表倒计时以及闹铃还有到计时功能-Multifunction electronic clock design, stopwatch and countdown timer alarm function as well as to