Datasheet

STM8L151x2, STM8L151x3 Pin description
Doc ID 018780 Rev 4 27/112
Table 3. Legend/abbreviation for table 4
Type I= input, O = output, S = power supply
Level
Output HS = high sink/source (20 mA)
FT Five-volt tolerant
Port and control
configuration
Input float = floating, wpu = weak pull-up
Output T = true open drain, OD = open drain, PP = push pull
Reset state
Bold X (pin state after reset release).
Unless otherwise specified, the pin state is the same during the reset phase (i.e.
“under reset”) and after internal reset release (i.e. at reset state).
Table 4. Low density STM8L15xxx pin description
Pin number
Pin name
Type
I/O level
Input Output
Main function
(after reset)
Default alternate
function
LQFP48
UFQFPN32 UFQFPN28 UFQFPN20
TSSOP20
floating
wpu
Ext. interrupt
High sink/source
OD
PP
21114NRST/PA1
(1)
I/O X HS X Reset PA1
32225
PA2/OSC_IN/
[USART_TX]
(2)
/
[SPI_MISO]
(2)
I/O X XXHSXXPort A2
HSE oscillator input /
[USART transmit] / [SPI
master in- slave out] /
43336
PA3/OSC_OUT/[USA
RT_RX]
(2)
/[SPI_MOSI
]
(2)
I/O X XXHSXXPort A3
HSE oscillator output /
[USART receive]/ [SPI
master out/slave in]/
544- -
PA4/TIM2_BKIN/
[TIM2_ETR]
(2)
ADC1_IN2
I/O X XXHSXXPort A4
Timer 2 - break input /
[Timer 2 - external
trigger] /ADC1 input 2
655- -
PA5/TIM3_BKIN/
[TIM3_ETR]
(2)
/ADC1_
IN1
I/O X XXHSXXPort A5
Timer 3 - break input /
[Timer 3 - external
trigger] /
ADC1input 1
76- - -
PA6/ADC1_TRIG/
ADC1_IN0
I/O X XXHSXXPort A6
ADC1- trigger
/ADC1input 0
8----PA7 I/O X XXHSXXPort A7
24 13 12 7 10
PB0
(3)
/TIM2_CH1/
ADC1_IN18
I/O X XXHSXXPort B0
Timer 2 - channel 1 /
ADC1_IN18
25 14 13 8 11
PB1/TIM3_CH1/
ADC1_IN17
I/O X XXHSXXPort B1
Timer 3 - channel 1 /
ADC1_IN17
26 15 14 9 12
PB2/ TIM2_CH2/
ADC1_IN16
I/O X XXHSXXPort B2
Timer 2 - channel 2
ADC1_IN16
27 16 15 10 13
PB3/TIM2_ETR/
ADC1_IN15/RTC_AL
ARM
(4)
I/O X XXHSXXPort B3
Timer 2 - external
trigger / ADC1_IN15 /
RTC_ALARM
(4)