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AN2606 Datasheet(PDF) 101 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) 101 Page - STMicroelectronics

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DocID13801 Rev 21
101/155
AN2606
STM32F401xB(C) devices bootloader
154
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 for USARTx bootloaders.
I2C1 bootloader
I2C1
Enabled
The I2C1 configuration is:
I2C speed: up to 400 KHz, 7-bit address,
slave mode, analog filter ON. Slave 7-bit
address: 0b0111001x (where x = 0 for write
and x = 1 for read)
I2C1_SCL pin
Input/Output
PB6 pin: clock line is used in open-drain
mode.
I2C1_SDA pin
Input/Output
PB7 pin: data line is used in open-drain
mode.
I2C2 bootloader
I2C2
Enabled
The I2C2 configuration is:
I2C speed: up to 400 KHz, 7-bit address,
slave mode, analog filter ON. Slave 7-bit
address: 0b0111001x (where x = 0 for write
and x = 1 for read)
I2C2_SCL pin
Input/Output
PB10 pin: clock line is used in open-drain
mode.
I2C2_SDA pin
Input/Output
PB3 pin: data line is used in open-drain
mode.
I2C3 bootloader
I2C3
Enabled
The I2C3 configuration is:
I2C speed: up to 400 KHz, 7-bit address,
slave mode, analog filter ON. Slave 7-bit
address: 0b0111001x (where x = 0 for write
and x = 1 for read)
I2C3_SCL pin
Input/Output
PA8 pin: clock line is used in open-drain
mode.
I2C3_SDA pin
Input/Output
PB4 pin: data line is used in open-drain
mode.
Table 52. STM32F401xB(C) configuration in System memory boot mode (continued)
Bootloader
Feature/Peripheral
State
Comment



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