STM8L151C2 datasheet(31/123 Pages) STMICROELECTRONICS

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DS7204 Rev 11

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STM8L151x2, STM8L151x3

Pinout and pin description

Note:

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: Low-density STM8L151x2/3 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 and STM8L16xxx reference manual (RM0031).

132 28 20

PA0(8)/[USART_CK](2)

SWIM/BEEP/IR_TIM

(9)

I/O

(9)

XX Port A0

[USART1 synchronous

clock](2) / SWIM input

and output /

Beep output / Infrared

Timer output

-- VSSIO

I/O ground voltage

-- VDDIO

I/O supply 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 STM8L15xxx and STM8L16xxx reference manual (RM0031).

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

duplication of the function).

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

20-pin and 28-pin packages only.

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

implemented).

20-pin packages only.

28-pin packages 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 4. Low-density STM8L151x2/3 pin description (continued)

Pin number

Pin name

Input

Output

Default alternate

function

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