AN3427 datasheet(13/52 Pages) STMICROELECTRONICS

Part #	AN3427

Description	Migrating a microcontroller application from STM32F1 to STM32F2 series

PDF	52 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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13 / 52 page

AN3427

Peripheral migration

Doc ID 019001 Rev 1

13/52

3.2.3

Dual SRAM

The 128KB of SRAM is made of 2 blocks; one 112KB and one 16KB. Both can be accessed

simultaneously by 2 masters in 0 WS (CPU, DMAs, Ethernet, USB HS).

The 16KB SRAM can be used as a buffer for high speed peripherals like USB-HS, Ethernet,

Camera, without impacting the CPU performance.

3.3

Memory mapping

The peripheral address mapping has been changed in the F2 series vs. F1 series, the main

change concerns the GPIOs which have been moved to the AHB bus instead of the APB

bus to allow them to operate at maximum speed.

The tables below provide the peripheral address mapping correspondence between F2 and

F1 series.

Table 3.

IP bus mapping differences between STM32 F1 and STM32 F2 series

Peripheral

STM32 F2 series

STM32 F1 series

Bus

Base address

Bus

Base address

FSMC Registers

AHB3

0xA0000000

AHB

0xA0000000

RNG

AHB2

0x50060800

HASH

0x50060400

CRYP

0x50060000

DCMI

0x50050000

USB OTG FS

0x50000000

AHB

0x50000000

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