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cc2530 外部中断的标志位会同时置位吗?

Other Parts Discussed in Thread: CC2530

    将4路信号输入cc2530,分别使用了P0.4、P0.5、P0.6、P0.7引脚。4个管脚配置输入三态模式。每次进中断函数总是有多个标志位被置位,这正常吗?看通过示波器看波形,这几个信号应该是不会同时触发中断,但是中断标位置基本都是2位及以上置位,这是为什么?