Hello @PSEBA.1 ,
For STM32H7B3 MCU, the LCD-TFT display controller provides a 24-bit parallel digital RGB (Red, Green, Blue) and delivers all signals to interface directly to a broad range of LCD and TFT panels up to XGA (1024x768) resolution.
If you want to use an 800x480 LCD, it must be calculate the frame buffer size and check if the framebuffer can be located in the internal SRAM or external SRAM/SDRAM. For that I advise you to refer to LCD-TFT display controller (LTDC) on STM32 MCUs application note and precisely "6.2.2 How to check if a specific display size matches the hardware configuration" Section.
Also, it is necessary to refer to the LCD datasheet and precisely to timing parameters to determinate the LCD_CLK.
The example shared in AN4861 "6.2 Example: creating a basic graphical application" can help you to check all constraints and configure the 800x480 LCD.
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Kaouthar
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