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AN2606 Datasheet(PDF) 42 Page - STMicroelectronics |
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AN2606 Datasheet(HTML) 42 Page - STMicroelectronics |
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42 / 155 page  STM32F2xxxx devices bootloader AN2606 42/155 DocID13801 Rev 21 10 STM32F2xxxx devices bootloader Two bootloader versions are available on STM32F2xxxx devices: • V2.0 supporting USART1 and USART3 This version is embedded in STM32F2xxxx devices revision B. • V3.2 supporting USART1, USART3, CAN2 and DFU (USB FS Device) This version is embedded in STM32F2xxxx devices revision X and Y. 10.1 Bootloader V2.x 10.1.1 Bootloader configuration The STM32F2xxxx bootloader is activated by applying pattern1 (described in Table 2: Bootloader activation patterns). The following table shows the hardware resources used by this bootloader. Table 18. STM32F2xxxx configuration in System memory boot mode Bootloader Feature/Peripheral State Comment Common to all bootloaders RCC HSI enabled The system clock frequency is 24 MHz. RAM - 8 Kbytes starting from address 0x2000 0000. System memory - 30688 bytes starting from address 0x1FFF 0000 contain the bootloader firmware. IWDG - The independent watchdog (IWDG) prescaler is configured to its maximum value and is periodically refreshed to prevent watchdog reset (in case the hardware IWDG option was previously enabled by the user). Power - Voltage range is set to [1.62 V, 2.1 V]. In this range internal Flash write operations are allowed only in byte format (Half-Word, Word and Double-Word operations are not allowed). The voltage range can be configured in run time using bootloader commands. USART1 bootloader USART1 Enabled Once initialized, the USART1 configuration is: 8 bits, even parity and 1 Stop bit. USART1_RX pin Input PA10 pin: USART1 in reception mode USART1_TX pin Output PA9 pin: USART1 in transmission mode USART3 bootloader (on PC10/PC11) USART3 Enabled Once initialized, the USART3 configuration is: 8 bits, even parity and 1 Stop bit. USART3_RX pin Input PC11 pin: USART3 in reception mode USART3_TX pin Output PC10 pin: USART3 in transmission mode |
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