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Boot modes Boot mode selection BOOT1 BOOT0 (opposite of nBOOT1 option bit) (pin) x Boot mode Aliasing 0 User Flash Main Flash memory is selected as boot space 1 1 System memory System memory is selected as boot space 0 1 SRAM1 Embedded SRAM1 is selected as boot space • Flash Bank1 boot: Option Bit BFB2 = 0 • Flash Bank2 boot: Option Bit BFB2 = 1 • Bootloader supports: USART1/2/3, I2C1/2/3, SPI1/2/3, USB DFU 11/08/2015 52