此实验实现一个8位的循环移位寄存器，移位的频率是2Hz，移位的方向（左移或是右移）可控。为了能显示移位的结果，我们采用一个数码管的8个段来表示这个寄存器的值。-The experimental realization of an 8-bit cyclic shift register, the shift frequency is 2Hz, the shift in the direction (left or right) control. In order to show the resul