AN2606 datasheet(25/155 Pages) STMICROELECTRONICS

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AN2606

STM32F105xx/107xx devices bootloader

154

STM32F105xx/107xx devices bootloader

5.1

Bootloader configuration

The STM32F105xx/107xx bootloader is activated by applying pattern1 (described in

Table 2: Bootloader activation patterns). The following table shows the hardware resources

used by this bootloader.

Table 8. STM32F105xx/107xx configuration in System memory boot mode

Bootloader

Feature/Peripheral

State

Comment

Common to all

bootloaders

RCC

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 the 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.

The Clock Security System (CSS) interrupt

is enabled for the CAN and DFU

bootloaders. Any failure (or removal) of the

external clock will generate system reset.

IWDG

The independent watchdog (IWDG)

prescaler is configured to its maximum

value and is periodically refreshed to

prevent watchdog reset (in case the

hardware IWDG option was previously

enabled by the user).

System memory

18 Kbytes starting from address 0x1FFF

B000 contain the bootloader firmware.

RAM

4 Kbytes starting from address 0x20000000

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 in reception mode

USART1_TX pin

Output push-pull

PA9 pin: USART1 in transmission mode

USART1 and

USART2 bootloaders

SysTick timer

Enabled

Used to automatically detect the serial baud

rate from the host for USARTx bootloader.

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