CD00237391 datasheet(20/177 Pages) STMICROELECTRONICS

20 / 177 page

Description

STM32F20xxx

20/177

Doc ID 15818 Rev 9

2.2.8

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 share some centralized 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 and UART

●

General-purpose, basic and advanced-control timers TIMx

●

DAC

●

SDIO

●

Camera interface (DCMI)

●

ADC.

2.2.9

Flexible static memory controller (FSMC)

The FSMC is embedded in all STM32F20x devices. 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

●

Maximum frequency (f

HCLK) for external access is 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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