说明: General descr iption - 6 2 System features - 8 3 SD Memory Card System Concept - 9 3.1 Bus Topology - 9 3.1.1 SD bus - 10 3.1.2 SPI bus - 11 3.2 Bus Protocol - 12 3.2.1 SD bus - 12 3.2.2 SPI Bus - 15 3.3 SD Memory Card - Pins and Registers - 17 3.4
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