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Table 3 MicroSD card pin details

From: A low cost and fast controller architecture for multimedia data storage and retrieval to flash-based storage device

Pin No. Name Function in SD mode Function in SPI mode
1 Dat2/NC Data line 2 Unused
2 DAT3/(\(\bar {CS}\)) Data line 3 Chip select/slave select (\(\bar {SS}\))
3 CMD/DI Command line MOSI
4 VDD Supply voltage Supply voltage
5 Clock Clock Clock (SCLK)
6 GND Ground Ground
7 DAT0/DO Data line 0 MISO
8 DAT1/IRQ Data line 1 Unused/IRQ