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TDC7201: 通过MSP430的P2.0接口输出PWM信号(3V高低电平),在示波器显示的波形为何不正确?

Part Number: TDC7201

如图,MSP430通过杜邦母头连接其P2.0和GND接口,另一端鲨鱼夹出来连接示波器的鲨鱼夹,在示波器上显示的信号为一条直线,为何未正确输出PWM信号?