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关于CC2541外部中断

Other Parts Discussed in Thread: CC2541

请问CC2541的外部中断的问题。使用按键可以wakeup芯片从PM3苏醒,我发现只要是上升沿就能检测到外部中断,请问在那里可以设置下降沿可以驱动外部中断的。谢谢。