STM8L151C4U6 datasheet(34/122 Pages) STMICROELECTRONICS

34 / 122 page

Pin description

STM8L151xx, STM8L152xx

34/122

Doc ID 15962 Rev 5

4.1

System configuration options

As shown in Table 5: 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).

- VSS2

IOs ground voltage

132 28 A4

PA0(8)/[USART1_CK](3)/

SWIM/BEEP/IR_TIM (9)

I/O

X(8)

(9)

XX Port A0

[USART1 synchronous

clock](3) / SWIM input

and output /

Beep output / Infrared

Timer output

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 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 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 and protection diode to VDD are not

implemented).

Available on STM8L151xx devices only.

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

High Sink LED driver capability available on PA0.

Table 5.

STM8L15x pin description (continued)

number

Pin name

Input

Output

Default alternate

function

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