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F2812上电后复位引脚有周期性负脉冲输出



各位好,最近遇到一个奇怪的问题,已经焊了好几个板子了,电源芯片用的是70151,DSP芯片是F2812,上电时序均正常,上电后,XRS引脚有周期性负脉冲输出,请各位高手指教,谢谢~

F2812实验板测试实验现象.pdf