利用实验机上提供的8279键盘电路，数码显示电路，设计一个电子钟，用小键盘控制电子钟的启停及初始值的预值。-experimental plane on the 8279 keyboard circuit, a digital display circuit, design an electronic bell, the small keyboard control clock off of the initial value and the value in advance.

多功能数字钟设计，对大家一定会有帮助的，请回贴哦-multifunction digital clock design, we will certainly be of help, please unidentified oh

基于DS1302，LCD1602，DS18B20的数字时钟的设计-Design of Digital Clock Based on DS1302, LCD1602 and DS18B20