微电子:嵌入式系统能保持较高的频率,但每次从同一端口输入信号未必能保持最好的效果。请换一端口,并以不 同电压输入变频信号
micro-electronics:embed system can keep high frequency but it can never be perfect if be input in
the some port.try to change a different one and even change a different voltage frequency conversion