Datasheet

STM8L051F3 Pin description
Doc ID 022985 Rev 1 21/46
4 Pin description
Figure 3. STM8L051Fx 20-pin TSSOP20 package pinout
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Table 4. Low density value line STM8L05xxx pin description
pin
n°
Pin name
Type
Input Output
Main function
(after reset)
Default alternate function
TSSOP20
floating
wpu
Ext. interrupt
High sink/source
OD
PP
4 NRST/PA1
(1)
I/O X HS X Reset PA 1
5
PA 2/ OS C_ I N/ [USART_TX]
(2)
/
[SPI_MISO]
(2)
I/O X XXHSXXPort A2
HSE oscillator input / [USART
transmit] / [SPI master in- slave out]
6
PA 3/ OS C_ O UT /[USART_RX]
(2)
/[
SPI_MOSI]
(2)
I/O X XXHSXXPort A3
HSE oscillator output / [USART
receive]/ [SPI master out/slave in]/
10 PB0
(3)
/TIM2_CH1/ADC1_IN18 I/O X XXHSXXPort B0 Timer 2 - channel 1 / ADC1_IN18
11 PB1/TIM3_CH1/ADC1_IN17 I/O X XXHSXXPort B1 Timer 3 - channel 1 / ADC1_IN17
12 PB2/ TIM2_CH2/ ADC1_IN16 I/O X XXHSXXPort B2 Timer 2 - channel 2 ADC1_IN16
13
PB3/TIM2_ETR/
ADC1_IN15/RTC_ALARM
I/O X XXHSXXPort B3
Timer 2 - external trigger /
ADC1_IN15 / RTC_ALARM
14 PB4
(3)
/SPI1_NSS/ADC1_IN14 I/O X XXHSXXPort B4
SPI master/slave select /
ADC1_IN14
15
PB5/SPI_SCK/
/ADC1_IN13
I/O X XXHSXXPort B5 [SPI clock] / ADC1_IN13
16
PB6/SPI1_MOSI/
ADC1_IN12
I/O X XXHSXXPort B6
SPI master out/
slave in / ADC1_IN12