STM32 Built-in Bootloader

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All STM32 devices have a pin labelled Boot0 which serves one purpose only. If left dangling or tied to GND the device will boot normally, but if pulled high the device will enter a special bootstrap mode.

Further Reading

The various boot modes of STM32 microcontrollers is described in details in AN2606 Application note - STM32 microcontroller system memory boot mode.

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