I have purchased MMC card which was in package of kingston . I mail to the kingston manufacturer for send dara sheet . But they said me that there product is only to use for mobile phones not for industrial use.

I am currently using AT89S8252 SPI port to run MMC card in spi mode.

The initilization steps are carried out successfully. but When i try to read CSD,CID registeres contents then i observe the contants of these registers are not followed by datatoken of 0xFE but these are after data token of 0xFC.


After when i try to read a sector after sending command and getting response 0x00, i never get data token 0xFE.

Similery in case to write a sector after send cmd and getting getting response 0x00 then send 0xFE, 512 byte data, and two byte cheachsum . After this i find 0xFF always.