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AN4286 Scheda tecnica(PDF) 30 Page - STMicroelectronics

Il numero della parte AN4286
Spiegazioni elettronici  SPI protocol used in the STM32 bootloader
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4286 Scheda tecnica(HTML) 30 Page - STMicroelectronics

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AN4286
Bootloader command set
37
2.10
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 master. After 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 22. Write Unprotect command: master side



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