STM8AL3LE8x datasheet(38/133 Pages) STMICROELECTRONICS

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Pin description

STM8AL31E8x STM8AL3LE8x

38/133

DocID027180 Rev 5

Note:

The slope control of all GPIO pins, except true open drain pins, are programmable. By

default the slope control is limited to 2 MHz.

System configuration options

As shown in Table 5: High-density STM8AL3xE8x 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

STM8L051/L052 Value Line, STM8L151/L152, STM8L162, STM8AL31, STM8AL3L MCU

lines reference manual (RM0031).

PA0(8)/[USART1_CK](2)/

SWIM/BEEP/IR_TIM (9)

I/O

XHS X

X Port A0

[USART1 synchronous

clock](2) / SWIM input and

output /

Beep output / Infrared Timer

output

68 56 40 VSS2

S-

- IOs ground voltage

67 55 39 VDD2

S-

- IOs supply voltage

- VSS4

S-

- IOs ground voltage

- VDD4

S-

- 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 open-drain or push-pull, not as a general purpose input. Refer to Section Configuring NRST/PA1

pin as general purpose output in STM8L051/L052 Value Line, STM8L151/L152, STM8L162, STM8AL31, STM8AL3L MCU

lines reference manual (RM0031).

2. [ ] 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 onSTM8AL3LE8xdevices only.

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

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

6. 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).

7. Available on STM8AL3LE8x devices only. On STM8AL31E8x devices it is reserved and must be tied to VDD.

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

9. High Sink LED driver capability available on PA0.

Table 5. High-density STM8AL3xE8x pin description (continued)

number

Pin name

Input

Output

Default alternate function

STM8AL3LE8x Datasheet(PDF) 38 Page - STMicroelectronics

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