现在大多数学习单片机者，都有一个共同的难点，就是占空比部分，因为它用到了很多单片机基础知识，如寄存器，中断等知识，希望这个资源有助于你的学习-The majority of single-chip are now learning, have a common difficulty is that part of the duty cycle, because it used a lot of basic knowledge of single-chip, such as registers,