利用DS12cr887时钟芯片的电子钟程序，单片机用的是c52-the program written in C language in the MCU of C51 which realize the function of electronic clock with the chip name DS12c887r

基于keil编写的C51源程序，是一个单片机实现的电子钟的程序，有闹铃！-Keil prepared source of C51, is a single-chip implementation of the electronic clock program, alarm!