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tms320f28069如何vdd 比vddio 上电快



tms320f28069如何vdd 比vddio 上电快,我电路设计是,vdd处使用的2.2uf的电容,上电后,单片机io口高电平,使我的继电器开断一下。(此时还未进入程序)如何解决这个问题谢谢!