Datasheet

Pin description STM8L051F3
24/96 DS9178 Rev 4
Table 4. STM8L051F3 pin description
pin
n°
Pin name
Type
I/O level
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- XReset PA1
5
PA2/OSC_IN/[USART_TX]
(2)
/
[SPI_MISO]
(2)
I/O - X XXHSXX
Port
A2
HSE oscillator input / [USART
transmit] / [SPI master in- slave out]
6
PA3/OSC_OUT/[USART_RX]
(2)
/[SPI_MOSI]
(2)
I/O - X XXHSXX
Port
A3
HSE oscillator output / [USART
receive]/ [SPI master out/slave in]
10 PB0
(3)
/TIM2_CH1/ADC1_IN18 I/O - X XXHSXX
Port
B0
Timer 2 - channel 1 / ADC1_IN18
11 PB1/TIM3_CH1/ADC1_IN17 I/O - X XXHSXX
Port
B1
Timer 3 - channel 1 / ADC1_IN17
12 PB2/ TIM2_CH2/ ADC1_IN16 I/O - X XXHSXX
Port
B2
Timer 2 - channel 2 ADC1_IN16
13
PB3/TIM2_ETR/
ADC1_IN15/RTC_ALARM
I/O - X XXHSXX
Port
B3
Timer 2 - external trigger /
ADC1_IN15 / RTC_ALARM
14 PB4
(3)
/SPI1_NSS/ADC1_IN14 I/O - X XXHSXX
Port
B4
SPI master/slave select /
ADC1_IN14
15
PB5/SPI_SCK/
/ADC1_IN13
I/O - X XXHSXX
Port
B5
[SPI clock] / ADC1_IN13
16
PB6/SPI1_MOSI/
ADC1_IN12
I/O - X XXHSXX
Port
B6
SPI master out/
slave in / ADC1_IN12
17 PB7/SPI1_MISO/ADC1_IN11 I/O - X XXHSXX
Port
B7
SPI1 master in- slave out/
ADC1_IN11
18 PC0/I2C_SDA I/O FT X -X-T
(4)
Port
C0
I2C data
19 PC1/I2C_SCL I/O FT X -X-T
(3)
Port
C1
I2C clock
20
PC4/USART_CK/
I2C_SMB/CCO/ADC1_IN4
I/O - X XXHSXX
Port
C4
USART synchronous clock /
I2C1_SMB / Configurable clock
output / ADC1_IN4
1
PC5/OSC32_IN /[SPI1_NSS]
(2)
/
[USART_TX]/[TIM2_CH1]
I/O - X XXHSXX
Port
C5
LSE oscillator input / [SPI
master/slave select] / [USART
transmit]/Timer 2 -channel 1
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