STM8S207MB datasheet(32/103 Pages) STMICROELECTRONICS

32 / 103 page

Pinouts and pin description

STM8S207xx, STM8S208xx

32/103

Doc ID 14733 Rev 12

5.2

Alternate function remapping

As shown in the rightmost column of the pin description table, 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 8: Option bytes on page 46. 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 family reference manual, RM0016).

79 63 47 43 31

PD6/

UART3_RX(1)

I/O X

Port D6

UART3 data

receive

80 64 48 44 32 PD7/TLI

I/O X

Port D7

Top level

interrupt

TIM1_CH4

[AFR4](5)

The default state of UART1_RX and UART3_RX pins is controlled by the ROM bootloader. These pins are pulled up as

part of the bootloader activation process and returned to the floating state before a return from the bootloader.

The beCAN interface is available on STM8S208xx devices only

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).

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

Available in 44-pin package only. On other packages, the AFR4 bit is reserved and must be kept at 0.

Table 6.

Pin description (continued)

Pin number

Pin name

Input

Output

Default

alternate

function

Alternate

function

after remap

[option bit]

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