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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN2606 датащи(PDF) 67 Page - STMicroelectronics |
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AN2606 датащи(HTML) 67 Page - STMicroelectronics |
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67 / 155 page  DocID13801 Rev 21 67/155 AN2606 STM32F302xB(C)/303xB(C) devices bootloader 154 The bootloader has two case of operation depending on the presence of the external clock (HSE) at bootloader startup: • If HSE is present and has a value of 24, 18, 16, 12, 9, 8, 6, 4 or 3 MHz, the system clock is configured to 48 MHz with HSE as clock source. The DFU interface, USART1 and USART2 are functional and can be used to communicate with the bootloader device. • If HSE is not present, the HSI is kept as default clock source and only USART1 and USART2 are functional. The external clock (HSE) must be kept if it’s connected at bootloader startup because it will be used as system clock source. USART2 bootloader USART2 Enabled Once initialized, the USART2 configuration is: 8 bits, even parity and 1 Stop bit. The USART2 uses its remapped pins. USART2_RX pin Input PD6 pin: USART2 in reception mode USART2_TX pin Output PD5 pin: USART2 in transmission mode DFU bootloader USB Enabled USB used in FS mode USB_DM pin Input/Output PA11: USB DM line. USB_DP pin PA12: USB DP line An external pull-up resistor 1.5 KOhm must be connected to USB_DP pin. Table 32. STM32F302xB(C)/303xB(C) configuration in System memory boot mode (continued) Bootloader Feature/Peripheral State Comment |
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