Transcription of AN3155 Application note - STMicroelectronics
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AN3155 Application note - STMicroelectronics
February 2022AN3155 Rev 151/481AN3155 Application noteUSART protocol used in the STM32 bootloader IntroductionThis Application note describes the USART protocol used in the STM32 microcontroller bootloader, providing details on each supported document applies to STM32 products embedding any bootloader version, as specified in Application note AN2606 STM32 system memory boot mode, available on These products are listed in Ta b l e 1, and are referred to as STM32 throughout the more information about the USART hardware resources and requirements for your device bootloader, refer to the already mentioned AN2606. Table 1. Applicable productsTypeProduct seriesMicrocontrollersSTM32F0 SeriesSTM32F1 SeriesSTM32F2 SeriesSTM32F3 SeriesSTM32F4 SeriesSTM32F7 SeriesSTM32G0 SeriesSTM32G4 SeriesSTM32H7 SeriesSTM32L0 SeriesSTM32L1 SeriesSTM32L4 SeriesSTM32L5 SeriesSTM32U5 SeriesSTM32WB SeriesSTM32WL Rev 15 Contents1 USART bootloader code sequence.
Communication safety. All communication from the programming tool (PC) to the device is verified by: 1. Checksum: received blocks of data bytes ar e XOR-ed. A byte containing the computed XOR of all previous bytes is added to the end of each communication (checksum byte). Command (1) 1.
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