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AN3155 Fiches technique(PDF) 30 Page - STMicroelectronics

No de pièce AN3155
Description  USART protocol used in the STM32 bootloader
PDF  37 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3155 Fiches technique(HTML) 30 Page - STMicroelectronics

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Bootloader command set
AN3155
30/37
DocID17066 Rev 6
3.10
Write Unprotect command
The Write Unprotect command is used to disable the write protection of all the Flash
memory sectors. When the bootloader receives the Write Unprotect command, it transmits
the ACK byte to the host. After the transmission of the ACK byte, the bootloader disables
the write protection of all the Flash memory sectors. After the unprotection operation the
bootloader transmits the ACK byte.
At the end of the Write Unprotect command, the bootloader transmits the ACK byte and
generates a system Reset to take into account the new configuration of the option byte.
Figure 20. Write Unprotect command: host side
1. WPUN = Write Unprotect.



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