STM32 SD

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Name Pin on SD F4xx Description
DAT3 1 PA8 Serial Data 3
CMD 2 PA6 Command
GND 3 N/C Not connected/used on micro-SD
VCC 4 3.3V Power supply
CLK 5 PB15 Clock
MMC-SD-miniSD-microSD-Color-Numbers-Names.png

Black Pill

Name Pin on SD STM32F411
DAT3 1 PA8