pin belegung:

PA0 - MMC - 
PA1 - MMC - 
PA2 - MMC - 
PA3 - MMC - 

PA7 - "Ausschalter"

PB0 - Progger - MOSI
PB1 - Progger - MISO
PB2 - Progger - SCK
PB3 - Speaker

PB7 - Reset


mmc-code from http://www.ulrichradig.de/home/index.php/avr/mmc-sd