一些关于SD卡的操作资料，在做单片机开发或其他嵌入式开发时非常有用！-SD card about the operation of information, development or other embedded microcontroller to do when developing very useful!

sc6600m原理图，SC6600M外围接口设计,包括显示，音频、键盘、SD卡、SIM卡接口电路、基带接口电路！-the sc6600m schematics, SC6600M peripheral interface design, including display, audio, keyboard, SD card, SIM card interface circuit, baseband interface circuit!