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UM1079
Table 8. MCU pin description versus board function (continued)
MCU pin
Main
Alternate
function
functions
TIM3_CH1/LCD_S
PC6
EG24
TIM3_CH2/LCD_S
PC7
EG25
TIM3_CH3/LCD_S
PC8
EG26
TIM3_CH4/LCD_S
PC9
EG27
USART3_TX/LCD_
PC10
SEG28/LCD_SEG4
0/LCD_COM4
USART3_RX/LCD_
PC11
SEG29/LCD_SEG4
1/ LCD_COM5
USART3_CK/LCD_
PC12
SEG30/LCD_SEG4
2/ LCD_COM6
PC13
RTC_AF1/WKUP2
PC14
OSC32_IN
PC15
OSC32_OUT
TIM3_ETR/LCD_S
EG31/
PD2
LCD_SEG43/LCD_
COM7
OSC_IN
PH0
OSC_O
PH1
UT
-
-
-
-
-
-
-
-
LQF
Linear
Push
P64
LCD
Touch
butt
pin
glass
Sensor
num
SEG
37
-
18
SEG
38
-
19
SEG
39
-
20
SEG
40
-
21
SEG
51
-
22
SEG
52
-
23
53
-
-
2
-
-
3
-
-
4
-
-
54
-
-
5
-
-
6
-
-
-
-
-
-
-
-
-
-
-
-
-
-
DocID018789 Rev 4
Board function
I
LED SWD OSC
DD
on
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
CNT_
-
-
-
EN
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Extension connectors
Pow
Free
er
P1 P2
I/O
supp
ly
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
X
-
-
-
-
-
4
OSC
32_I
-
-
5
N
OSC
32_O
-
-
6
UT
-
X
-
-
OSC
-
-
7
_ IN
OSC
_OU
-
-
8
T
-
-
GND
2
-
-
GND
9
-
-
GND
28
-
-
VDD
3
27
26
25
24
15
14
13
-
-
-
12
-
-
2
5
28
-
29/38
37
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