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F28M35 BOOT启动除了引脚

 我想问一下关于F28M35,在官方提供的原理图中PG7-gpio47(52管脚)被拨码开关拉高,可以用来选择启动方式。同时这个管脚也连接到了以太网LAN8710A的18管脚,这个管脚又被拉低,这怎么解释?