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您好，请问c5517的NANDFCR寄存器的CS2_USE_NAND位如果置1，对应的EM_CS2引脚会置高还是置低？
为什么我对NANDFCR寄存器低四位的操作不会影响EM_CSxn的电平，为什么一直是高电平？
CS2_USE_NAND置1表示使能EM_CS2管脚为nand flash mode。
EM_CS2的时序在读写nand flash的时候自动产生。
