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STM32F427XX Datasheet(PDF) 21 Page - STMicroelectronics

Part # STM32F427XX
Description  ARM Cortex-M4 32b MCUFPU, 225DMIPS, up to 2MB Flash/2564KB RAM, USB OTG HS/FS, Ethernet, 17 TIMs, 3 ADCs, 20 comm. interfaces, camera & LCD-TFT
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM32F427XX Datasheet(HTML) 21 Page - STMicroelectronics

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STM32F427xx STM32F429xx
Functional overview
43
3.4
Embedded Flash memory
The devices embed a Flash memory of up to 2 Mbytes 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 256Kbytes of system SRAM including 64 Kbytes of CCM (core coupled memory)
data RAM
RAM memory is accessed (read/write) at CPU clock speed with 0 wait states.
4 Kbytes of backup SRAM
This area is accessible only from the CPU. Its content 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, LCD-TFT, and DMA2D) and the slaves (Flash memory, RAM, FMC, AHB and APB
peripherals) and ensures a seamless and efficient operation even when several high-speed
peripherals work simultaneously.


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