AN4088 datasheet(9/71 Pages) STMICROELECTRONICS

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AN4088

Peripheral migration

As shown in Table 7, 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 RTC are different from the STM32F1

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

features in STM32F0 series.

All these modified peripherals in the STM32F0 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 STM32F1 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 7 gives a general overview of this classification.

Table 7. STM32 peripheral compatibility analysis, STM32F1 versus STM32F0 series(1)

Peripheral

STM32F1 STM32F0

Compatibility

Features

Pinout

Firmware driver

SPI

Yes

Yes+

Two FIFO available, 4 bit to

16 bit data size selection

Identical

Partial 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 reverse capability and

initial CRC value

Partial compatibility

EXTI

Yes

Yes+

Some peripherals are able to

generate event in stop mode

Identical

Full compatibility

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