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AN2606 Datasheet(PDF) 19 Page - STMicroelectronics |
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AN2606 Datasheet(HTML) 19 Page - STMicroelectronics |
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19 / 155 page  DocID13801 Rev 21 19/155 AN2606 General bootloader description 154 3.3 Hardware connection requirements To use the USART bootloader, the host has to be connected to the (RX) and (TX) pins of the desired USARTx interface via a serial cable. Figure 1. USART Connection 1. A Pull-UP resistor should be added, if pull-up resistor are not connected in host side. 2. An RS232 transceiver must be connected to adapt voltage level (3.3V - 12V) between STM32 device and host. Note: +V typically 3.3 V and R value typically 100KOhm.This value depend on the application and the used hardware. To use the DFU, connect the microcontroller's USB interface to a USB host (i.e. PC). Figure 2. USB Connection 1. This additional circuit permits to connect a Pull-Up resistor to (DP) pin using VBus when needed. Refer to product section (Table which describes STM32 Configuration in system memory boot mode) to know if an external pull-up resistor must be connected to (DP) pin. Note: +V typically 3.3 V.This value depends on the application and the used hardware. |
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