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C6748读写SD卡



             请教大家一个问题,C6748对SD卡进行读写时,MMC Argument Register (MMCARGHL)寄存器存放的是读写sd 卡的地址,是个32位寄存器,也就是最大寻址4G,可是现在的SHDC卡都是32G,那么我如何向超出4G地址写入数据呢,datashet上,只有MMCARGHL这个寄存器的啊,