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AN2606 датащи(PDF) 39 Page - STMicroelectronics |
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AN2606 датащи(HTML) 39 Page - STMicroelectronics |
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39 / 155 page ![]() DocID13801 Rev 21 39/155 AN2606 STM32L1xxxD devices bootloader 154 The system clock is derived from the embedded internal high-speed RC for USARTx bootloader. This internal clock is used also for DFU bootloader but only for the selection phase. An external clock in the range of [24, 16, 12, 8, 6, 4, 3, 2] MHz is required for DFU bootloader execution after the selection phase. 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 16. STM32L1xxxD configuration in System memory boot mode (continued) Bootloader Feature/Peripheral State Comment |
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