STM32F217VG datasheet(18/175 Pages) STMICROELECTRONICS

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Functional overview

STM32F21xxx

18/175

DocID17050 Rev 9

3.4

Embedded Flash memory

The STM32F21x devices embed a 128-bit wide Flash memory of 128 Kbytes, 256 Kbytes,

512 Kbytes, 768 Kbytes or 1 Mbytes available for storing programs and data.

The devices also feature 512 bytes of OTP memory that can be used to store critical user

data such as Ethernet MAC addresses or cryptographic keys.

3.5

CRC (cyclic redundancy check) calculation unit

The CRC (cyclic redundancy check) calculation unit is used to get a CRC code from a 32-bit

data word and a fixed generator polynomial.

Among other applications, CRC-based techniques are used to verify data transmission or

storage integrity. In the scope of the EN/IEC 60335-1 standard, they offer a means of

verifying the Flash memory integrity. The CRC calculation unit helps compute a software

signature during runtime, to be compared with a reference signature generated at link-time

and stored at a given memory location.

3.6

Embedded SRAM

All STM32F21x products embed:

•

Up to 128 Kbytes of system SRAM accessed (read/write) at CPU clock speed with 0

wait states

•

4 Kbytes of backup SRAM.

The content of this area is protected against possible unwanted write accesses, and is

retained in Standby or VBAT mode.

3.7

Multi-AHB bus matrix

The 32-bit multi-AHB bus matrix interconnects all the masters (CPU, DMAs, Ethernet, USB

HS) and the slaves (Flash memory, RAM, FSMC, AHB and APB peripherals) and ensures a

seamless and efficient operation even when several high-speed peripherals work

simultaneously.

STM32F217VG 数据表(PDF) 18 Page - STMicroelectronics

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