STM32F207IE datasheet(18/163 Pages) STMICROELECTRONICS

18 / 163 page

Description

STM32F205xx, STM32F207xx

18/163

Doc ID 15818 Rev 7

2.2.9

DMA

The flexible 16-stream general-purpose DMAs (8 streams for DMA1 and 8 streams for

DMA2) are able to manage memory-to-memory, peripheral-to-memory and memory-to-

peripheral transfers. They share some centralized FIFOs for APB/AHB peripherals, support

burst transfer and are designed to provide the maximum peripheral bandwidth (AHB/APB)

and performance.

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 and UART

●

General-purpose, basic and advanced-control timers TIMx

●

DAC

●

SDIO

●

Camera interface (DCMI)

●

ADC.

2.2.10

FSMC (flexible static memory controller)

The FSMC is embedded in the STM32F205xx and STM32F207xx family. It has four Chip

Select outputs supporting the following modes: PC Card/Compact Flash, SRAM, PSRAM,

NOR Flash and NAND Flash.

Functionality overview:

●

Write FIFO

●

Code execution from external memory except for NAND Flash and PC Card

●

The targeted frequency, fCLK, is equal to HCLK/2, so external access is at 60 MHz

when HCLK is at 120 MHz and external access is at 30 MHz when HCLK is at 60 MHz

LCD parallel interface

The FSMC can be configured to interface seamlessly with most graphic LCD controllers. It

supports the Intel 8080 and Motorola 6800 modes, and is flexible enough to adapt to

specific LCD interfaces. This LCD parallel interface capability makes it easy to build cost-

effective graphic applications using LCD modules with embedded controllers or high

performance solutions using external controllers with dedicated acceleration.

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