从中国学术期刊网上花钱下载的《基于C8051单片机的大容量SD卡存储系统的研究》，共享于pudn，供学习SD的朋友参考。-Online academic journals from China to spend money to download the "single-chip based on the C8051 high capacity SD card storage system", to share in pudn, for study and reference SD friend