本实验利用单片机实现m序列的输出，其移位寄存器的长度为3 - 8可循环调节。单片机板上按键KEY1实现级数n的循环自加，按键KEY2实现级数n的循环自减，输出口P1^4输出m序列周期同步信号，输出口P1^6输出相应的m序列。-In this study, the use of single-chip microcomputer m sequence of output, the length of the shift register 3- 8 can be recycled adjustable. SCM series n-board keys KEY1 to achieve the cycle of self-plus, key KEY2 series n the cycle of self-realization by the output port P1 ^ 4 output m sequence cycle synchronization signals, the output port P1 ^ 6 output of the corresponding m-sequences.