sd/sdhc 규격

정리필요..

[링크 : http://www.dharmanitech.com/2009/01/sd-card-interfacing-with-atmega8-fat32.html]
[링크 : http://techblog.tistory.com/90]
[링크 : http://stackoverflow.com/questions/6423912/sdhc-card-spi-initialisation]

[링크 : http://www.psism.com/Apro-SD-THEMIS-datasheet.pdf]
[링크 : http://wiki.seabright.co.nz/wiki/SdCardProtocol.html]

[링크 : https://www.sdcard.org/downloads/pls/]
[링크 : https://www.sdcard.org/downloads/pls/simplified_specs/archive/partE1_100.pdf]
[링크 : https://www.sdcard.org/downloads/pls/simplified_specs/archive/partE1_200.pdf] 
[링크 : http://alumni.cs.ucr.edu/~amitra/sdcard/Additional/sdcard_appnote_foust.pdf] 

[링크 : http://elm-chan.org/docs/mmc/mmc_e.html]