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Pin number Pin name
Signal name
STM32 GPIO
Function
17 – 18
-
-
-
Not connected
19
GND
-
-
Ground
20
GND
-
-
Ground
21
-
-
-
Not connected
22
GND
-
-
Ground
23 – 27
-
-
-
Not connected
28
FMARK
DISP_TE
PA0
PC0
PA4
Display tearing effect output pin to synchronize MCU on
frame writing
29
-
-
-
Not connected
30
RESET
DISP_NRESET
PA1
PC1
PA6
Reset active low
31
-
-
-
Not connected
32
SI
SPIB_MOSI
PA10
Flash memory SPI master out/slave in
33
-
-
-
Not connected
34
RIGHT
KEY_RIGHT
PC2
PA0
Joystick right (active low)
35
SO
SPIB_MISO
PC2
SPI master in/slave out
36
SO
SPIB_MISO
PB14
SPI master in/slave out
37
SI
SPIB_MOSI
PC3
Flash memory SPI master out/slave in
38
UP
KEY_UP
PC0
PB12
PC0
PB13
PC2
PA3
Joystick up (active low)
1. STM32 GPIO for
,
2. STM32 GPIO for
,
,
and
.
3. STM32 GPIO for
.
4. STM32 GPIO for
5. STM32 GPIO for
6. STM32 GPIO for
,
7. STM32 GPIO for
.
8. STM32 GPIO for
9. STM32 GPIO for
.
10. STM32 GPIO for
UM2750
ST morpho connectors (CN2 and CN3)
UM2750
-
Rev 2
page 18/31