AN2606 datasheet(59/155 Pages) STMICROELECTRONICS

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AN2606

STM32F05xxx and STM32F030x8 devices bootloader

154

STM32F05xxx and STM32F030x8 devices bootloader

12.1

Bootloader configuration

The STM32F05xxx and STM32F030x8 devices bootloader is activated by applying pattern2

(described in Table 2: Bootloader activation patterns). The following table shows the

hardware resources used by this bootloader.

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

is required for the bootloader execution.

Note:

After the STM32F05xxx and STM32F030x8 devices have booted in bootloader mode, 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_TX).

Table 26. STM32F05xxx and STM32F030x8 devices 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 PLL clocked by HSI).

1 Flash Wait State.

RAM

2 Kbytes starting from address 0x20000000

are used by the bootloader firmware.

System memory

3 Kbytes starting from address

0x1FFFEC00, contain the bootloader

firmware.

IWDG

The independent watchdog (IWDG)

prescaler is configured to its maximum

value. It is periodically refreshed to prevent

watchdog reset in case the hardware IWDG

option was previously enabled by the user.

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

PA9 pin: USART1 in transmission mode.

USART2

bootloader

USART2

Enabled

Once initialized, the USART2 configuration

is 8 bits, even parity and 1 Stop bit.

USART2_RX pin

Input

PA15 pin: USART2 in reception mode.

USART2_TX pin

Output

PA14 pin: USART2 in transmission mode.

USART1 and

USART2

bootloaders

SysTick timer

Enabled

Used to automatically detect the serial baud

rate from the host.

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