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Bootloader description AN2662

8/83 Doc ID 14156 Rev 1

Table 2. STM32F105xx and STM32F107xx configuration in System memory boot mode

Bootloader Feature/Peripheral State Comment

Common to

all

bootloaders

Clock source

HSI enabled

The system clock frequency is 24 MHz using the PLL. This is

used only for USART1 and USART2 bootloaders and during

CAN2, USB detection for CAN and DFU bootloaders (Once

CAN or DFU bootloader is selected, the clock source will be

derived from external crystal).

HSE

enabled

The external clock is mandatory only for DFU and CAN

bootloaders and it must provide one of the following frequencies:

8 MHz, 14.7456 MHz or 25 MHz.

For CAN Bootloader, the PLL is used only to generate 48 MHz

when 14.7456 MHz is used as HSE.

For DFU Bootloader, the PLL is used to generate a 48 MHz

system clock from all supported external clock frequencies

System memory -

18 Kbytes starting from address 0x1FFF F000, contain the

bootloader firmware

RAM -

4 Kbytes starting from address 0x2000 0000 are used by the

bootloader firmware.

USART1

bootloader

USART1 Enabled

Once initialized the USART1 configuration is: 8-bits, even parity

and 1 Stop bit

USART1_RX pin Input PA10 pin: USART1 receive

USART1_TX pin Output PA9 pin: USART1 transmit

USART1 and

USART2

bootloaders

SysTick timer Enabled

Used to automatically detect the serial baud rate from the host

for USARTx bootloader.

USART2

bootloader

USART2 Enabled

Once initialized the USART2 configuration is: 8-bits, even parity

and 1 Stop bit. The USART2 uses its remapped pins.

USART2_RX pin Input PD6 pin: USART2 receive (remapped pin)

USART2_TX pin Output PD5 pin: USART2 transmit (remapped pin)

CAN2

bootloader

CAN2 Enabled

Once initialized the CAN2 configuration is: Baudrate 125 kbps,

11-bit identifier.

Note: CAN2 uses remapped pins.

CAN2_RX pin Input PB5 pin: CAN2 receive (remapped pin)

CAN2_TX pin Output PB6 pin: CAN2 transmit (remapped pin)

DFU

bootloader

USB OTG FS Enabled Once initialized the USB configuration is: Device

USB_VBUS Input Power supply voltage line

USB_ID Input ID line (used only for dual role devices)

USB_DM

Alternate

Function

USB Send-Receive data line

USB_DP

Alternate

Function

USB Send-Receive data line

Interrupts Enabled

USB_OTG_FS interrupt vector is enabled and used for USB

DFU communication.

Brand	ST
Model	STM32F105 series
Category	Microcontrollers
Language	English

ST STM32F105 series Application Note

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