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STM32F469 bảng dữ liệu(PDF) 28 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  LCD-TFT display controller (LTDC) on STM32 MCUs
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STM32F469 bảng dữ liệu(HTML) 28 Page - STMicroelectronics

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LCD-TFT (LTDC) display controller description
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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).



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