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PM0073 Fiches technique(PDF) 24 Page - STMicroelectronics

No de pièce PM0073
Description  STM32Wxxx Flash memory microcontrollers
PDF  34 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM0073 Fiches technique(HTML) 24 Page - STMicroelectronics

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Reading/programming the STM32Wxxx embedded Flash memory
PM0073
24/34
Doc ID 17766 Rev 5
On every system reset, the option byte loader (OBL) reads the information block and stores
the data into the Option byte register (FLASH_OBR) and the Write protection register
(FLASH_WRPR). Each option byte also has its complement in the information block. During
option loading, by verifying the option bit and its complement, it is possible to check that the
loading has correctly taken place. If this is not the case, an option byte error (OPTERR) is
generated. When a comparison error occurs, the corresponding option byte is forced to
0xFF. The comparator is disabled when the option byte and its complement are both equal
to 0xFF (Electrical Erase state).
All option bytes (but not their complements) are available to configure the product. The
option registers are accessible in read mode by the CPU. See Section 3: Register
descriptions for more details.



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