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AN2606 Datasheet(PDF) 118 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) 118 Page - STMicroelectronics

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STM32L1xxx6(8/B)A devices bootloader
AN2606
118/155
DocID13801 Rev 21
27
STM32L1xxx6(8/B)A
devices bootloader
27.1
Bootloader configuration
The STM32L1xxx6(8/B)A bootloader is activated by applying pattern1 (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.
Table 58. STM32L1xxx6(8/B)A configuration in System memory boot mode
Bootloader
Feature/Peripheral
State
Comment
Common to all
bootloaders
RCC
HSI enabled
The system clock frequency is 16 MHz.
RAM
-
2 Kbytes starting from address 0x20000000
are used by the bootloader firmware.
System memory
-
4 Kbytes starting from address
0x1FF00000 contain the bootloader
firmware.
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).
Power
-
Voltage range is set to Voltage Range 1.
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
PD6 pin: USART2 in reception mode
USART2_TX pin
Output
PD5 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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