ST STM32L4 5 Series Reference Manual page 384

Chrom-Art Accelerator™ controller (DMA2D)
Bits 23:16 RED[7: 0]: Red Value
Bits 15:8 GREEN[7: 0]: Green Value
Bits 7:0 BLUE[7: 0]: Blue Value
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These bits define the red value of the output image. These bits can only be written when
data transfers are disabled. Once the transfer has started, they are read-only.
These bits define the green value of the output image. These bits can only be written
when data transfers are disabled. Once the transfer has started, they are read-only.
These bits define the blue value of the output image. These bits can only be written
when data transfers are disabled. Once the transfer has started, they are read-only.
DocID024597 Rev 5
RM0351