说明：  1，不使用外部时钟芯片， 2，可调整时间和日期 3，使用AT89C51内部RTC(实时时钟,12MHz) 4,显示使用LCD1620 5，只设置了四个按键 a, 复位按键 b, 调整模态选择按键,切换调整不同参数 c, 上调按键,调整模式下按此键被调整值上调 d, 下调按键,调整模式下按此键被调整值下调. 6,使用Keil51编译 7，附带PROTEUS仿真图
(1, do not use an external clock chip 2, adjust the time and date 3, using AT89C51 internal RTC (real-time clock, 12MHz) 4, that the use of LCD1620 5, only four buttons set a, reset button b, the adjustment mode selection button, switch to adjust different parameters c, raised buttons, adjusting the model to adjust the value of this key has been raised d, down button to adjust mode to adjust the value of this bond was reduced. 6, the use of compiler Keil51 7, with PROTEUS simulation map)