我用4线JTAG给自制的MSP430FG4616PCB板烧录程序时，总是显示could not find device，我使用的是BGA封装的单片机，怎样检查JTAG四根数据线通信有无问题？用示波器单次捕捉RST引脚信号，并未发现电平变化，复位电路使用的是47k的上拉电阻和100nF的电容，是否有问题？
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四线JTAG给MSP430FG4616烧录程序could not find device
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