主要是矩阵键盘与单片机相连，实现按一次按键，向单片机传递一个值，单片机通过值得判断实现显示功能-Mainly the matrix keyboard and the microcontroller connected to achieve a press button, to the microcontroller to pass a value, the microcontroller through the judgments to achieve the display function

通过矩阵键盘实现按键功能，时钟可设置兼秒表和闹钟功能(Electronic Perpetual Calendar)