STM32F469 datasheet(28/91 Pages) STMICROELECTRONICS

部品番号	STM32F469

部品情報	LCD-TFT display controller (LTDC) on STM32 MCUs

PDF	91 Pages

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メーカー	STMICROELECTRONICS [STMicroelectronics]

ホームページ	http://www.st.com

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28 / 91 page

LCD-TFT (LTDC) display controller description

AN4861

28/91

DocID029237 Rev 2

Figure 19 summarizes all layer color framebuffer configurable parameters.

Figure 19. Programmable color layer in framebuffer

Pixel format conversion (PFC)

After being read from the framebuffer, the pixel data is transformed from the configured pixel

input format to the internal ARGB8888 format.

The components that have a width of less than 8 bits get expanded to 8 bits by bit

replication.

The 8 MSB bits are chosen. Figure 20 shows a conversion from RGB565 input pixel format

to the internal ARGB8888 format.

Figure 20. Pixel format conversion from RGB565 input pixel format to the internal

ARGB8888 format

Note:

Using two layers creates bandwidth constraints on the system. It is preferable to use only

one layer and to do the composition with the Chrom-Art Accelerator® during the framebuffer

calculation (see Section 4.2.2: Checking display compatibility considering the memory

bandwidth requirements).

STM32F469 データシート(PDF) 28 Page - STMicroelectronics