UM0629

STM8L1/L2 motherboard

Doc ID 15312 Rev 2

13/26

2.13

Daughterboard extension connectors CN3 and CN4

Two 36-pin male headers CN3 and CN4 can be used to connect the daughterboard to the

motherboard. All GPI/Os are available on it. Please refer to Table 8 and Table 9 for pin-out

definition.

Table 7.

MicroSD connector CN1

Pin number

Description

Pin number

Description

1

Reserved

5

SCLK/PB5

2

CS/PB4

6

Vss/GND

3

DI/PB6

7

DO/PB7

4VDD

8

Reserved

9

GND

10

Not used

Table 8.

Daughterboard extension connector CN3

Pin number

Description

Pin number

Description

1

GND

2

PC4

3PC54PC6

5

Reserved

6

Reserved

7

Reserved

8

Reserved

9PA0

10

GND

11

PA1

12

PA2

13

Reserved

14

PA3

15

Reserved

16

Reserved

17

PA4

18

Reserved

19

GND

20

PA5

21

Reserved

22

PA6

23

Reserved

24

Reserved

25

PD0

26

Reserved

27

PD2

28

PD1

29

PD3

30

GND

31

NC

32

NC

33

PB0

34

PB1

35

PB2

36

PB3