数字钟相关程序，能实现时间的自动跳动，还能改动时间，整点报时-Digital clock-related procedures, to achieve the automatic beating of time, but also changes in time, the whole point timekeeping

数电模型的各种代码,基本数电的模型。非常的使用。-digital model

DDS信号源设计，通过频率控制字k可以自动调节波形频率的输出-DDS signal source design, frequency control word k can automatically adjust the frequency of the waveform output