实现逻辑分析仪的通道选择。具体选择是有一个按键输入8位的控制信号与没路信号进行逻辑与当控制信号K(i)是‘1’是选择i路信号输出数据，当‘0’时输出全部为零不显示i路波形。-Realize the logical analyzer of chanSpecific choice is to have a keystroke eight control signals and no way signal logic and when the control signal K (I) is 1 i