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STM32F401 bảng dữ liệu(PDF) 17 Page - STMicroelectronics

tên linh kiện STM32F401
Giải thích chi tiết về linh kiện  Up to 12 communication interfaces
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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STM32F401 bảng dữ liệu(HTML) 17 Page - STMicroelectronics

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STM32F401xD STM32F401xE
Functional overview
54
Figure 4. Multi-AHB matrix
3.8
DMA controller (DMA)
The devices feature two general-purpose dual-port DMAs (DMA1 and DMA2) with 8
streams each. They are able to manage memory-to-memory, peripheral-to-memory and
memory-to-peripheral transfers. They feature dedicated FIFOs for APB/AHB peripherals,
support burst transfer and are designed to provide the maximum peripheral bandwidth
(AHB/APB).
The two DMA controllers support circular buffer management, so that no specific code is
needed when the controller reaches the end of the buffer. The two DMA controllers also
have a double buffering feature, which automates the use and switching of two memory
buffers without requiring any special code.
Each stream is connected to dedicated hardware DMA requests, with support for software
trigger on each stream. Configuration is made by software and transfer sizes between
source and destination are independent.
The DMA can be used with the main peripherals:
•
SPI and I2S
•
I2C
•
USART
•
General-purpose, basic and advanced-control timers TIMx
•
SD/SDIO/MMC host interface
•
ADC



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