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AN3154 bảng dữ liệu(PDF) 27 Page - STMicroelectronics

tên linh kiện AN3154
Giải thích chi tiết về linh kiện  CAN protocol used in the STM32 bootloader
PDF  34 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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AN3154 bảng dữ liệu(HTML) 27 Page - STMicroelectronics

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AN3154
Bootloader command set
33
Figure 21. Write Protect command: device side
1. WP = Write Protect
The STM32 sends messages as follows:
ACK message: Std ID = 0x63, DLC = 1, data[0] = ACK if the content of the command is
correct and ROP is not active else data[0] = NACK.
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 message to the host if ROP is disabled else it transmits NACK. After the
transmission of the ACK message, the bootloader disables the write protection of all the
Flash memory sectors.
At the end of the Write Unprotect command, the bootloader transmits the ACK message and
generates a system Reset to take into account the new configuration of the option byte.



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