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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AN4286 데이터시트(PDF) 5 Page - STMicroelectronics |
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AN4286 데이터시트(HTML) 5 Page - STMicroelectronics |
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5 / 38 page  SPI Bootloader code sequence AN4286 5/38 DocID024458 Rev 2 1 SPI Bootloader code sequence The STM32 bootloader is an SPI slave. For all SPI bootloader operations, the NSS pin (chip select) must be tied low. If the NSS pin is tied high, the communication on the SPI bus will be ignored by the STM32 slave. Figure 1. Bootloader for STM32 with SPI Once the system memory boot mode is entered and the STM32 microcontroller has been configured (for more details, refer to your STM32 system memory boot mode application note) the bootloader code begins to scan the SPI_MOSI line pin, waiting to detect a synchronization byte on the bus (0x5A). Once a detection occurs, the SPI bootloader firmware waits to receive the acknowledge procedure (refer to Figure 2) and then starts to receive master commands. |
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