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AN2606 bảng dữ liệu(PDF) 115 Page - STMicroelectronics

tên linh kiện AN2606
Giải thích chi tiết về linh kiện  STM32 microcontroller system memory boot mode
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AN2606 bảng dữ liệu(HTML) 115 Page - STMicroelectronics

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AN2606
STM32F411xx devices bootloader
154
The system clock is derived from the embedded internal high-speed RC for USARTx, I2Cx
and SPIx bootloaders. This internal clock is also used for CAN and DFU (USB FS Device)
but only for the selection phase. An external clock multiple of 1 MHz (between 4 and
26 MHz) is required for CAN and DFU bootloader execution after the selection phase.
DFU bootloader
USB
Enabled
USB OTG FS configured in Forced Device
mode
USB_DM pin
Input/Output
PA11: USB DM line.
USB_DP pin
PA12: USB DP line
No external Pull-up resistor is required
TIM11
Enabled
This timer is used to determine the value of
the HSE. Once the HSE frequency is
determined, the system clock is configured
to 60 MHz using PLL and HSE.
Table 56. STM32F411xx configuration in System memory boot mode (continued)
Bootloader
Feature/Peripheral
State
Comment



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