ST STM32F051R8T6 User Manual page 34

Connecting modules on the prototyping board
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Connecting with Arduino shields (continued)
Arduino ICSP connector
MISO
VCC 3.3V
SCK
MOSI
RST
GND
Doc ID 022910 Rev 2
STM32F0DISCOVERY
PB4 SPI1_MISO
3V VDD
PB3 SPI1_SCK
PB5 SPI1_MOSI
NRST Reset discovery
GND Reference Ground
UM1525