Hardware and layout UM1656
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GND
22
GND
GND
3
GND
9
GND
33 33
Table 5. MCU pin description versus board function (continued)
MCU pin Board function
Main
function
Alternate
functions
LQFP64
Push button
LED
SWD
OSC
Free I/O
Power supply
CN3
P1
P2
