STM8L151C4 datasheet(30/101 Pages) STMICROELECTRONICS

30 / 101 page

Pin description

STM8L151xx, STM8L152xx

30/101

Doc ID 15962 Rev 2

4.1

System configuration options

As shown in Table 4: STM8L15x 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 STM8L15xxx

reference manual (RM0031).

-8

7 VDD/VDDA/VREF+

Digital power supply / Analog supply

voltage / ADC1 positive voltage reference

6 VSS/VSSA/VREF-

I/O ground / Analog ground voltage /

ADC1 negative voltage reference

- VDDIO

IOs supply voltage

- VSSIO

IOs ground voltage

132 28

PA0/[USART1_CK](3)/

SWIM/BEEP/IR_TIM (6)

I/O

(6)

XX Port A0

[USART1 synchronous clock](3) /

SWIM input and output /

Beep output / Infrared Timer out-

put

When the PA1/NRST pin is used as general purpose (PA1), it can be configured only as output push-pull, not as a general

purpose input. Refer to Section Configuring NRST/PA1 pin as general purpose output in the STM8L15x reference manual

(RM0031).

Available on STM8L152xx devices only.

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

duplication of the function).

In the open-drain output column, ‘T’ defines a true open-drain I/O (P-buffer and protection diode to VDD are not implemented).

Available on STM8L151xx devices only.

High Sink LED driver capability available on PA0.

Table 4.

STM8L15x pin description (continued)

number

Pin name

Input

Output

Default alternate function

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