AN2606 datasheet(90/155 Pages) STMICROELECTRONICS

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STM32F07xxx devices bootloader

AN2606

90/155

DocID13801 Rev 21

Note:

After the STM32F07xxx devices have booted in Bootloader mode using USART2, the serial

wire debug (SWD) communication is no more possible until the system is reset, because

SWD uses PA14 pin (SWCLK) which is already used by the Bootloader (USART2_RX).

The system clock is derived from the embedded internal high-speed RC, no external quartz

is required for the bootloader execution.

I2C1 bootloader

I2C1

Enabled

The I2C1 configuration is:

I2C speed: up to 400 KHz, 7-bit address,

slave mode, analog filter ON. Slave 7-bit

address: 0b0111011x (where x = 0 for write

and x = 1 for read)

I2C1_SCL pin

Input/Output

PB6 pin: clock line is used in open-drain

mode.

I2C1_SDA pin

Input/Output

PB7 pin: data line is used in open-drain

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

No external pull-up resistor is required.

Table 44. STM32F07xxx configuration in System memory boot mode (continued)

Bootloader

Feature/Peripheral

State

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