Peripheral migration

AN4660

8/27

DocID027558 Rev 2

2

Peripheral migration

2.1

STM32 product cross-compatibility

The STM32 Series embed 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 STM32 products but

have only minor differences (in general to support new features), so 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 a new development at application level.

•

The SW compatibility mentioned in the Table 5 only refers to the register description for

"low level" drivers.

The Cube Hardware Abstraction Layer (HAL) is compatible between STM32F42xxx/F43xxx

and STM32F74xxx/F75xxx.

Table 5 shows STM32 peripheral compatibility between STM32F42xxx/F43xxx and

STM32F74xxx/F75xxx.

Table 5. STM32 peripheral compatibility analysis STM32F42xxx/F43xxx versus

STM32F74xxx/F75xxx

Peripherals

STM32F42xxx/

F43xxx

STM32F74xxx/

F75xxx

Compatibility

-

-

-

SW

Comments

Flash memory in Kbyte

2048

1024

--

SRAM(KB)

System

256

(115+16+64+64)

320

(240+16+64)

Instruction

NA

16

Backup

4

4

Timers

GP

10

10

Yes

-

Advanced

control

22

Yes

-

Basic

2

2

Yes

-

Low-power

NA

1

NA

-