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TMS320F28027 XPS引脚每13.4ms出现60us低电平

Other Parts Discussed in Thread: TMS320F28027

Hi  TI工程师:

TMS320F28027在使用中出现以下现象:

1:连上仿真器运行完全没有问题

2:去掉仿真器运行,则XPS引脚每13.4ms出现60us低电平。

     就算是全新没有程序的芯片,焊接上PCB,上电后XPS引脚每13.4ms出现60us低电平。