STM8L052R8 datasheet(28/109 Pages) STMICROELECTRONICS

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Pin description

STM8L052R8

28/109

Doc ID023337 Rev 2

PG2/USART3_CK

I/O FT(2)

Port G2

USART 3 synchronous

clock

PG3[TIM3_ETR]

I/O FT(2)

Port G3 [Timer 3 - trigger]

9VSSA/VREF-

Analog ground voltage /

ADC1 negative voltage reference

VDD2

IOs supply voltage

VSS2

IOs ground voltage

PA0(6)/[USART1_CK](8)/

SWIM/BEEP/IR_TIM (7)

I/O

XX Port A0

[USART1 synchronous

clock](8) / SWIM input and

output /Beep output

/ Infrared Timer output

VDD3

IOs supply voltage

VSS3

IOs ground voltage

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 STM8L15x and STM8L16x reference manual (RM0031).

In the 5 V tolerant I/Os, protection diode to VDD is not implemented.

A pull-up is applied to PB0 and PB4 during the reset phase. These two pins are input floating after reset release.

In the open-drain output column, ‘T’ defines a true open-drain I/O (P-buffer, weak pull-up and protection diode to VDD are

not implemented).

SEG/COM multiplexing available on medium+ and high density devices. SEG signals are available by default (see

reference manual for details).

The PA0 pin is in input pull-up during the reset phase and after reset release.

High Sink LED driver capability available on PA0.

[ ] Alternate function remapping option (if the same alternate function is shown twice, it indicates an exclusive choice not a

duplication of the function).

Table 4.

High density value line STM8L05xxx pin description (continued)

number

Pin name

Input

Output

Default alternate function

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