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AN2606 Datasheet(PDF) 30 Page - STMicroelectronics |
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AN2606 Datasheet(HTML) 30 Page - STMicroelectronics |
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30 / 155 page ![]() STM32F105xx/107xx devices bootloader AN2606 30/155 DocID13801 Rev 21 5.3.3 USART bootloader Get-Version command returns 0x20 instead of 0x22 Description In USART mode, the Get-Version command (defined in AN3155) returns 0x20 instead of 0x20. This limitation is present on bootloader versions V1.0 and V2.0, while it is fixed in bootloader version 2.1. Workaround None. 5.3.4 PA9 excessive power consumption when USB cable is plugged in bootloader V2.0 Description When connecting a USB cable after booting from System-Memory mode, PA9 pin (connected to VBUS=5 V) is also shared with USART TX pin which is configured as alternate push-pull and forced to 0 since the USART peripheral is not yet clocked. As a consequence, a current higher than 25 mA is drained by PA9 I/O and may affect the I/O pad reliability. This limitation is fixed in bootloader version 2.1 by configuring PA9 as alternate function push-pull when a correct 0x7F is received on RX pin and the USART is clocked. Otherwise, PA9 is configured as alternate input floating. Workaround None. |
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