用2片4位移位寄存器实现可控乘/除法（2到8，步长为2n）电路，最大数字是两位10进制数64。 -With two 4-bit shift register controllable multiplication/division (2-8 steps of 2n) circuit, the maximum number is two decimal 64.

串口调试工具，接收串口数据，转换成10进制显示，64位为一组数据-Serial debugging tool to receive serial data, converted into decimal display, 64-bit for a group of data