You can use Enable to lower the output frequency by connecting it to a prescaler. 通过连接前置比例器，使用使能来降低输出频率。
If the sampling frequency is less than this, we can expect a serious distortion of output frequency which is generally referred to as aliasing. 如果取样频率小于此数，那么输出频率就要产生严重畸变，通常假频指的就是这种情况。
