STM32F479 datasheet(15/91 Pages) STMICROELECTRONICS

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AN4861

Overview of LTDC controller and STM32 MCUs graphical portfolio

Overview of LTDC controller and STM32 MCUs

graphical portfolio

This section illustrates the LTDC controller benefits and summarizes the graphical portfolio

of the STM32 microcontrollers.

2.1

LCD-TFT display controller on STM32 MCUs

The LTDC on the STM32 microcontrollers is an on-chip LCD display controller that provides

up to 24-bit parallel digital RGB signals to interface with various display panels. The LTDC

can also drive other display technologies with parallel RGB interface like the AMOLED

displays. The LTDC allows interfacing with low-cost display panels which do not embed

neither a controller nor a graphic RAM.

2.2

LTDC availability and graphic portfolio across STM32

families

Table 3 summarizes the STM32 embedding an LTDC and details the corresponding

available graphic portfolio.

Table 3. STM32 MCUs embedding an LTDC and their available graphic portfolio

STM32 lines

FLASH

(bytes)

chip

SRAM

(bytes)

Quad-

SPI(1)

Max AHB

frequency

(MHz)(2)

Max FMC

SRAM

and

SDRAM

frequency

(MHz)

Max

pixel

clock

(MHz)

(3)

JPEG

codec

DMA2D

(4)

MIPI

-DSI

host

(5)

Graphic

libraries

STM32F429/

439

Up to

2 M

256 k

180

Yes

TouchGFX

Embedded

wizard

SEGGER

STemWin

STM32F469/

479

Up to

2 M

384 k

Yes

180

Yes

STM32F7x6

Up to

1 M

320 k

Yes

216

100

Yes

STM32F7x7

Up to

2 M

512 k

Yes

216

100

Yes

STM32F7x8/

STM32F7x9

Yes

216

100

Yes

1. The Quad-SPI interface allows interfacing with external memories in order to extend the size of the application. For more

details on STM32 MCUs QSPI interface refer to application note Quad-SPI (QSPI) interface on STM32 microcontrollers

(AN476).

2. LTDC fetches graphical data at AHB speed.

3. Maximum pixel clock value at IO level, refer to Table 10 and Table 11for maximum pixel clock at system level.

Pixel clock (LCD_CLK) form relevant STM32 datasheet.

4. Chrom-Art Accelerator®

5. The integrated MIPI-DSI controller allows easier PCB design with fewer pins, lower EMI (electromagnetic interference) and

lower power consumption. For more details on STM32's MIPI-DSI host refer to application note AN4860.

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