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MMC cards and AVR Microcontroller

hi, I'm in need of using mmc or sd memmory card in my project but unfortunatly i don't have any idea how they works? i know they need 3.3 v for working. should this voltage be percise? I want to read and also write on it in spi mode using an avr. I've used the programm suggested in some relevant sites but it seems there is a bug in those programmes or mey be i can't used them properly.could anyone introduce me a reliable source on this issue? meny thanks

Reply to
mr.sina.kh
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Loads of good info at:

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And lots of card details from:

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Regards,

Adrian Jansen           adrianjansen at internode dot on dot net
Design Engineer         J & K Micro Systems
Microcomputer solutions for industrial control
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Adrian Jansen

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