Datasheet

DS9178 Rev 4 25/96
STM8L051F3 Pin description
41
Note: 1 The slope control of all GPIO pins, except true open drain pins, can be programmed. By
default, the slope control is limited to 2 MHz.
4.1 System configuration options
As shown in Table 4: STM8L051F3 pin description, some alternate functions can be
remapped on different I/O ports by programming one of the two remapping registers
described in the “Routing interface (RI) and system configuration controller” section in the
STM8L050J3, STM8L051F3, STM8L052C6, STM8L052R8 MCUs and STM8L151/L152,
STM8L162, STM8AL31, STM8AL3L lines reference manual (RM0031).
2
PC6/OSC32_OUT/[SPI_SCK]
(2)
/[USART_RX]/[TIM2_CH2]
I/O - X XXHSXX
Port
C6
LSE oscillator output / [SPI clock] /
[USART receive]/
Timer 2 -channel 2
9
PD0/TIM3_CH2/[ADC1_TRIG]
(2
)
/ADC1_IN22
I/O - X XXHSXX
Port
D0
Timer 3 - channel 2 /
[ADC1_Trigger] / ADC1_IN22
8V
DD
/ V
DDA
/ V
REF+
S-
Digital supply voltage /
ADC1 positive voltage reference
7V
SS
/ V
REF-
/ V
SSA
-
Ground voltage / ADC1 negative voltage
reference / Analog ground voltage
3
PA0
(5)
/[USART_CK]
(2)
/
SWIM/BEEP/IR_TIM
(6)
I/O - X X X
HS
(6)
XX
Port
A0
[USART1 synchronous clock]
(2)
/
SWIM input and output /
Beep output / Infrared timer output
1. At power-up, the PA1/NRST pin is a reset input pin with pull-up. To be used as a general purpose pin (PA1), it can be
configured only as output open-drain or push-pull, not as a general purpose input. Refer to Section Configuring NRST/PA1
pin as general purpose output in the STM8L051/L052 Value Line, STM8L151/L152, STM8L162, STM8AL31, STM8AL3L
MCU lines reference manual (RM0031).
2. [ ] Alternate function remapping option (if the same alternate function is shown twice, it indicates an exclusive choice not a
duplication of the function).
3. A pull-up is applied to PB0 and PB4 during the reset phase. These two pins are input floating after reset release.
4. In the open-drain output column, ‘T’ defines a true open-drain I/O (P-buffer and protection diode to V
DD
are not
implemented).
5. The PA0 pin is in input pull-up during the reset phase and after reset release.
6. High Sink LED driver capability available on PA0.
Table 4. STM8L051F3 pin description (continued)
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
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