STM8L151X8 datasheet(39/146 Pages) STMICROELECTRONICS

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STM8L151x6/8 STM8L152x6/8

Pin description

Note:

Slope control of all GPIO pins can be programmed except true open drain pins and by

default is limited to 2 MHz.

System configuration options

As shown in Table 5: High-density and medium+ density 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 STM8L05xxx, STM8L15xxx and STM8L16xxx reference manual

(RM0031).

- VSS4

- IOs ground voltage

- VDD4

- IOs supply voltage

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 push-pull, not as output open-drain nor 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).

3. Available on STM8L152x6/8 devices only.

4. Even if this I/O is not available on the device pin, it is considered as active and must be configured to input pull up or output

mode by software to avoid spurious behavior and increased consumption.

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

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

7. 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).

8. Available on STM8L152xx devices only. On STM8L151xx devices it is reserved and must be tied to VDD.

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

10. High Sink LED driver capability available on PA0.

Table 5. High-density and medium+ density STM8L15x pin description (continued)

Pin number

Pin name

Input

Output

Default alternate

function

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