Need info about interfacing MMC with AT89s8252

[mutlu_sgul]

Hello All...
I am using at89s8252 and I have to make an sd card data logger. I tried to use spi port of microcontroller also I simulated this protocol by writing soft. By two methods I could not get the valid response of CMD00. I did everything as the manual sad as 80 clock cycles before set to cs low etc. Does any one give me detailed information about interfacing 8252 with MMC?

 

[NOORPURI]

Re: MMC with AT89s8252

I have recently tried much by AT89S8252 . But when i use AVR mCU by changing syntax only then i success. I think there is some diffenrence b/w AT89S87252 SPI core and ATMEGA 8515 core.

 

[umup]

MMC with AT89s8252

Most MMC/SD cards work in block mode (data can be readed/writed by sectors of 512 bytes), some of them can switch size of data block down to 1 byte. at89s8252 have not enough RAM for 512b sector buffer. Better use somesing like PIC/ATMega/ARM with at least 1K of RAM.

Show your initialization code.