STM32F401CB datasheet(16/134 Pages) STMICROELECTRONICS

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DocID024738 Rev 5

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STM32F401xB STM32F401xC

Functional overview

3.4

Embedded Flash memory

The devices embed up to 256 Kbytes of Flash memory available for storing programs and

data.

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 devices embed:

•

Up to 64 Kbytes of system SRAM which can be accessed (read/write) at CPU clock

speed with 0 wait states

3.7

Multi-AHB bus matrix

The 32-bit multi-AHB bus matrix interconnects all the masters (CPU, DMAs) and the slaves

(Flash memory, RAM, AHB and APB peripherals) and ensures a seamless and efficient

operation even when several high-speed peripherals work simultaneously.

Figure 4. Multi-AHB matrix

STM32F401CB Datasheet(PDF) 16 Page - STMicroelectronics