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AN2606 bảng dữ liệu(PDF) 44 Page - STMicroelectronics

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AN2606 bảng dữ liệu(HTML) 44 Page - STMicroelectronics

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STM32F2xxxx devices bootloader
AN2606
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DocID13801 Rev 21
10.1.3
Bootloader version
This following table lists the STM32F2xxxx devices V2.x bootloader versions:
Table 19. STM32F2xxxx bootloader V2.x versions
Bootloader
version
number
Description
Known limitations
V2.0
Initial V2.x bootloader version
When a Read Memory command or Write Memory
command is issued with an unsupported memory
address and a correct address checksum (ie.
address 0x6000 0000), the command is aborted by
the bootloader device, but the NACK (0x1F) is not
sent to the host. As a result, the next 2 bytes (which
are the number of bytes to be read/written and its
checksum) are considered as a new command and
its checksum.
For the CAN interface, the Write Unprotect
command is not functional. Instead you can use
Write Memory command and write directly to the
option bytes in order to disable the write
protection.(1)
1. If the “number of data - 1” (N-1) to be read/written is not equal to a valid command code (0x00, 0x01, 0x02,
0x11, 0x21, 0x31, 0x43, 0x44, 0x63, 0x73, 0x82 or 0x92), then the limitation is not perceived from the host
since the command is NACKed anyway (as an unsupported new command).



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