There are two optional SD card communication protocols: SD mode and SPI mode. SD model is a standard SD card reading and writing, but in the selection of SD mode, often need to select the SD card controller interface with MCU, or SD card to join the additional control unit to support the SD card reader. However, AT89C52 microcontroller is not integrated SD card controller interface to SD mode if the selected communication would in effect increase the cost of hardware products. The time to read and write data in SD card is not very demanding circumstances, the use SPI mode can say is the best solution. SPI, mode because, by four lines on all the data can be exchanged, and Du Mu Qian Ji Cheng MCU market, there are many existing SPI interface circuit using SPI mode on the SD card reader can be greatly Jianhua Cao Zuo hardware design.

SDCARD_MCS51\sd.DSN
............\sd.LST
............\sd.OBJ
............\sd.PWI
............\sdcard
............\sdcard.hex
............\sdcard.lnp
............\sdcard.M51
............\sdcard.Opt
............\sdcard.plg
............\sdcard.Uv2
............\sdcard_Opt.Bak
............\sdcard_Uv2.Bak
............\sd管脚.txt
............\STARTUP.A51
............\STARTUP.LST
............\STARTUP.OBJ
............\Last Loaded sd.DBK
............\sd.__i
............\sd.c
SDCARD_MCS51
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