.from: http://www.frank-zhao.com/cache/fat_sd.php
| Pin on SD card | Function | Connect to Pin on AVR |
| MOSI (Master Out Slave In) | The master refers to the device that generates the clock (the microcontroller), the SD card is the slave. Data on this pin travels from the microcontroller to the SD card. Also known as "DI". | MOSI |
| MISO (Master In Slave Out) | Data on this pin travels from the SD card to the microcontroller. Also known as "DO". | MISO |
| SCK | Serial clock pin, also known as "CLK" | SCK |
| CS | Chip select, the SD card pays attention to the data traveling on the SPI bus when this pin is low, and ignores the data on the bus when this pin is high | Port B 3, but it can really be any pin since this one is software definable. You should use a pull-up resistor (I use a 10k and it works fine) on this pin. |
| GND | Vss, ground, 0V | Ground |
| 3.3V+ | Vcc, power supply pin, supply 3.3V to this pin to power the card. | Only connect to a 3.3V power supply |
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