数字时钟，可以任意调节时间，年月日，有秒分时的独立和连显，按键接P1口的16个矩阵按键，动用了8个按键，同时显示8*8点阵的数字0到19循环-Digital clock, can be adjusted at the time, years on, there are second and even the obvious time-independent, key access port 16 P1 matrix keys, using the 8 keys, also showed the