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2812串口烧写程序



2812使用SCIA串口烧写程序时资料上说GPIOF4=0,GPIOF12=0,GPIOF3=1,GPIOF2=1,实际使用中每个口都需要进行相应的下拉或上拉么,具体的阻值该如何选取?用SDFlash串口能够烧写成功么,具体的连线该怎么弄呢?求高手能指点一下。