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AN3155 Fiches technique(PDF) 17 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) 17 Page - STMicroelectronics

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AN3155
Bootloader command set
All other addresses are considered not valid and are NACKed by the device.
When an application is loaded into RAM and then a jump is made to it, the program must be
configured to run with an offset to avoid overlapping with the first RAM memory used by the
bootloader firmware (refer to STM32 product datasheets and to the “STM32 microcontroller
system memory boot mode” application note - AN2606 for more details about the RAM
offset for the device you are using).
The Jump to the application works only if the user application sets the vector table correctly
to point to the application address.
Some products may return two NACKs instead of one single NACK when Read Protection
(RDP) is active (or Read Potection level 1 is active). To know if a given product returns one
single NACK or two NACKs in this situation, please refer to the known limitations section
relative to that product in AN2606.
Figure 11. Go command: device side



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