SHDC协议，SD2.0。单片机开发，大容量的SD卡开发协议，2G以下与2G以上的SD,microSD卡协议不一样。一个可以用SPI，另一个可以用SD协议-The SHDC agreement, SD 2.0. MCU development, large-capacity SD card development agreement, 2G following agreement with more than 2G SD and microSD card is not the same. One

SD插卡小音箱的单片机源代码，高度集成，一颗单片机可以完成解码和播放的功能-SD card small speakers microcontroller source code, and a high degree of integration, one the MCU can complete decoding and playback function

SD读卡器原理图，采用mega8单片机，对于开发USB接口非常有帮助。-Schematic of SD card reader,based on mega8 MCU,it s very help for development of USB interface.