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SD card reading and writing key points

  • 2013-03-20
  • 231.65KB
  • Points it Requires : 2

SD card has two optional communication protocols: SD mode and SPI mode. In order to simplify the circuit, SPI mode is selected. Mode selection: SD card defaults to SD mode. To enter SPI mode, follow the following steps. When the SD card receives the RESTE command (CMD0), pull down CS. The command CMD0 is 0, CMD16 is 16, and so on.

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