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AN2606 Datasheet(PDF) 89 Page - STMicroelectronics

Part # AN2606
Description  STM32 microcontroller system memory boot mode
PDF  155 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2606 Datasheet(HTML) 89 Page - STMicroelectronics

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AN2606
STM32F07xxx devices bootloader
154
20
STM32F07xxx devices bootloader
20.1
Bootloader configuration
The STM32F07xxx bootloader is activated by applying pattern2 (described in Table 2:
Bootloader activation patterns). The following table shows the hardware resources used by
this bootloader.
Table 44. STM32F07xxx configuration in System memory boot mode
Bootloader
Feature/Peripheral
State
Comment
Common to all
bootloaders
RCC
HSI enabled
The system clock frequency is 48 MHz with
HSI 48 MHz as clock source.
-
The Clock Recovery System (CRS) is
enabled for the DFU bootloaders to allow
USB to be clocked by HSI 48 MHz.
RAM
-
6 Kbytes starting from address 0x20000000
are used by the bootloader firmware
System memory
-
12 Kbytes starting from address
0x1FFFC800, 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 for USARTx bootloaders.



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