Hardware and layout
UM1574
34/48
Doc ID 023645 Rev 1
4.3.8
STM8AL board extension connection
Male headers P1 and P2 connectors can connect the STM8AL board to a standard
prototyping/wrapping board. Free GPI/Os of STM8AL3L68T are available on P1.
L99PM62GXP device I/Os are connected to P2.
P1 and P2 can also be probed by an oscilloscope, a logic analyzer or a voltmeter.
Table 10.
STM8AL board P1 pinout Microcontroller connectivity
Pin number
P1
Pin number
STM8AL
MCU
Board pin
name
Type
Main function
Alternate function
1
GND
Digital ground
2
2
NRST
I/O
Reset
PA1
3
45
PC6
I/O
Port C6
OSC32_OUT
4
44
PC5
I/O
Port C5
OSC32_IN
5
38
PC1
I/O
Port C1
I2C1_SCL
6
37
PC0
I/O
Port C0
I2C1_SDA
7
10
V
DD
Microcontroller Digital power supply
8
5V
5V board power supply (output 5V1 from
L99PM62GXP)
Table 11.
STM8AL board P2 pinout L99PM62GXP connectivity
(1)
1.
For additional information on L99PM62GXP device connectivity, please refer to product datasheet
available at www.st.com.
Pin
number
P2
Pin number
L99PM62GXP
Board pin
name
Type
Main function
1
3V3
3.3 V board power supply
(output 3.3 V from U11 PWR_STM8)
2
20
WU1
I
Wake-up input 1
3
28
OUT2
O
High-side driver output (7
, typ.)
4
29
OUT1
O
High-side driver output (7
, typ.)
5
30
O_HS
O
High-side driver (1
, typ.)
6
34
REL1
O
Low-side driver output (2
typ.)
7
35
REL2
O
Low-side driver output (2
typ.)
8
GND
Digital
ground
9
VBAT
I
External power supply (12Vdc typ.)