AN4654 datasheet(10/32 Pages) STMICROELECTRONICS

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Peripheral migration

AN4654

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DocID027444 Rev 1

Peripheral migration

As shown in Table 4, and further specified in Section 3.1, there are three categories of

peripherals.

The common peripherals are supported with the dedicated firmware library without any

modification, except if the peripheral instance is no longer present. You can change the

instance and, of course, all the related features (clock configuration, pin configuration,

interrupt/DMA request).

The modified peripherals such as ADC, RCC and I2C are different from the STM32L1 series

ones and should be updated to take advantage of the enhancements and the new features

in STM32L0 series.

All these modified peripherals in the STM32L0 series are enhanced to obtain smaller silicon

print with features designed to offer advanced high-end capabilities in economical end

products and to fix some limitations present in the STM32L1 series.

3.1

STM32 product cross-compatibility

The STM32 series embeds a set of peripherals which can be classed in three categories:

•

The first category is for the peripherals which are, by definition, common to all products.

Those peripherals are identical, so they have the same structure, registers and control

bits. There is no need to perform any firmware change to keep the same functionality,

at the application level, after migration. All the features and behavior remain the same.

•

The second category is for the peripherals which are shared by all products but have

only minor differences (in general to support new features). The migration from one

product to another is very easy and does not need any significant new development

effort.

•

The third category is for peripherals which have been considerably changed from one

product to another (new architecture, new features...). For this category of peripherals,

the migration will require new development, at the application level.

Table 4 gives a general overview of this classification.

Table 4. STM32 peripheral compatibility analysis, STM32L1 vs. STM32L0 series(1)

Peripheral

STM32L1 STM32L0

Compatibility

Features

Pinout

Firmware

SPI

Yes

Same features

Identical +

New GPIO added

Full compatibility

WWDG

Yes

Same features

Full compatibility

IWDG

Yes

Yes++

Added a Window mode

Partial compatibility

DBGMCU

Yes

No JTAG, No Trace

Identical for the SWD Partial compatibility

CRC

Yes

Yes++

Added user polynomial,

reverse capability

and initial CRC value

Partial compatibility

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