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关于C5517时钟设计的问题

你好,

        C5517我们不接USB,不带RTC。现在选择使用外部晶体是否只需要保证USBVDD_OSC这部分线路接通,CLKIN,CLK_SEL配置正确就ok了?USB_VDDA3P3是否直接地?谢谢!