利用51单片机定时器设计一个具有完整时钟功能的数字钟（能自动更新并显示时、分、秒，年月日），采用1602液晶显示，使用到矩阵键盘和独立键盘分设相应按键，可供时间调节。具备闹钟功能，能根据设定的起闹时间准时起闹。具有起闹时间设定、更改，闹钟开启、关闭功能。-51 single-chip timer to design a digital clock with full clock function (automatically updated and displayed, minutes, seconds, month, day), using the 1602 LCD, using matrix keyboard and a separate keyboard is divided into the corresponding button, the available timeregulation. With alarm clock function, set the alarm time from time from the downtown. Has since the alarm time set, change, alarm clock, open, close functions