Datasheet

STM8AF52/62xx, STM8AF51/61xx Pinouts and pin description

Doc ID 14395 Rev 9 37/110

6.2 Alternate function remapping

As shown in the rightmost column of Ta b l e 13, some alternate functions can be remapped at

different I/O ports by programming one of eight AFR (alternate function remap) option bits.

Refer to

Section 9: Option bytes on page 51. When the remapping option is active, the

default alternate function is no longer available.

To use an alternate function, the corresponding peripheral must be enabled in the peripheral

registers.

Alternate function remapping does not effect GPIO capabilities of the I/O ports (see the

GPIO section of the STM8S and STM8A microcontroller families reference manual,

RM0016).

1. In Halt/Active-halt mode, this pin behaves as follows:

- The input/output path is disabled.

- If the HSE clock is used for wakeup, the internal weak pull-up is disabled.

- If the HSE clock is off, the internal weak pull-up setting is used. It is configured through Px_CR1[7:0] bits of the

corresponding port control register. Px_CR1[7:0] bits must be set correctly to ensure that the pin is not left floating in

Halt/Active-halt mode.

2. In the open-drain output column, ‘T’ defines a true open-drain I/O (P-buffer, week pull-up and protection diode to V

are

not implemented)

3. The PD1 pin is in input pull-up during the reset phase and after reset release.

4. If this pin is configured as interrupt pin, it will trigger the TLI.