AN3139 datasheet(46/63 Pages) STMICROELECTRONICS

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Block-by-block compatibility analysis

AN3139

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Doc ID 16993 Rev 3

3.8

Communication peripherals

3.8.1

SPI

This peripheral is available in all STM8L sub-families. The differences are the supported

features:

●

DMA capability not supported in the STM8L10x sub-family

●

Hardware CRC feature for reliable communication not supported in the STM8L10x sub-

family.

When migrating from the STM8L10x sub-family to the STM8L15x sub-family, you have to

add the additional peripheral of the same type as first parameter in every function used from

the firmware library. You also have to add the CRC polynomial parameter in the SPI_Init()

function. A full compatibility, in terms of function parameter names, is guaranteed for all

common features.

Additional peripheral instances are available in the high/medium+ density

STM8L15x/STM8L16x devices (refer to Section 4.2: SPI on page 59).

3.8.2

I2C

This peripheral is available in all STM8L sub-families.

Note:

If true open drain lines are required, make sure that the default mapping is kept for SDA &

SCL functions as these functions are generally mapped to pins with true open drain

capabilities (which is not the case when SDA & SCL are remapped to other pins).

The differences are in the supported features:

●

DMA capability not supported in the STM8L10x sub-family

●

SMBUS 2.0/ PMBus not supported in the STM8L10x sub-family.

●

Dual addressing mode not supported in the STM8L10x sub-family

When migrating from the STM8L10x sub-family to the STM8L15x sub-family, you have to

add the additional peripheral of the same type as first parameter in every function used from

the firmware library. For the common features, a full compatibility, in terms of function

parameter names, is guaranteed.

Note:

I/Os with true open drain capabilities are available for I2C in all STM8L sub-families.

3.8.3

USART

This peripheral is present in the whole STM8L family. The differences lie in the supported

features. The following table gives an overview of the supported features for each family.

When migrating from the STM8L10x sub-family to the STM8L15x/STMP8L16x sub-family,

you have to add the additional peripheral of the same type as first parameter in every

function used from the firmware library. For the common features, a full compatibility, in

terms of function parameter names, is guaranteed.

Additional peripheral instances are available in the high/medium+ density

STM8L15x/STM8L16x devices (refer to Section 4.4: USART on page 60).

Refer to the STM8L10x microcontroller family reference manual (RM0013), STM8L15x

microcontroller family reference manual (RM0031), STM8L101x datasheet and STM8L15x

datasheet for more detailed information.

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