Table 6.
I/O configuration of ST morpho connector CN3
Pin number
Pin name
Signal name
STM32 GPIO
Function
1
LEFT
KEY_LEFT_PC9
Joystick left direction (active low)
2
CENTER
KEY_CENTER_PC8
Joystick center (active low)
3 – 4
-
-
-
Not connected
5
CS#
SPIB_NCS_PB9_PB7
Flash memory SPI chip select active high
6 - 8
-
-
-
Not connected
9
GND
-
-
Ground
10
-
-
-
Not connected
11
RS/SCL
SPIA_SCK_PA5_PB13
PA5
Display SPI serial clock
12
-
-
-
Not connected
13
SDO
SPIA_MISO_PA6_PB14
PA6
Display SPI master in/slave out
14
-
-
-
Not connected
15
SDI
SPIA_MOSI_PA7_PB15
PA7
Display SPI master out/slave in
16-19
-
-
-
Not connected
20
GND
-
-
Ground
21 – 25
-
-
-
Not connected
26
SO
SPIB_MISO_PC2_PA6
PA6
Flash memory SPI master in/slave out
27
-
-
-
Not connected
28
SCLK
SPIB_SCK_PB13_PA5
PA5
Flash memory SPI chip select active low
29
CS
SPIA_NCS_PB5_PB5
Display SPI chip select active high
30
SCLK
SPIB_SCK_PB13_PA5
Flash memory SPI chip select active low
31
WR
SPIA_DCX_PB3_PB3
Display SPI write enable
32
-
-
-
Not connected
33
SI
SPIB_MOSI_PC3_PA12
PA12
Flash memory SPI master out/slave in
34 - 38
-
-
-
Not connected
1. STM32 GPIO for
,
,
,
,
,
,
2. STM32 GPIO for
,
UM2750
ST morpho connectors (CN2 and CN3)
UM2750
-
Rev 1
page 13/21