LCD-TFT Controller (LTDC) RM0090
504/1731 DocID018909 Rev 11
16.7.20 LTDC Layerx Default Color Configuration Register (LTDC_LxDCCR)
(where x=1..2)
This register defines the default color of a layer in the format ARGB. The default color is
used outside the defined layer window or when a layer is disabled. The reset value of
0x00000000 defines a transparent black color.
Address offset: 0x9C + 0x80 x (Layerx -1), Layerx = 1 or 2
Reset value: 0x0000 0000
Bits 31:8 Reserved, must be kept at reset value
Bits 7:0 CONSTA[7:0]: Constant Alpha
These bits configure the Constant Alpha used for blending. The Constant Alpha is divided
by 255 by hardware.
Example: if the programmed Constant Alpha is 0xFF, the Constant Alpha value is
255/255=1
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
DCALPHA[7:0] DCRED[7:0]
rw rw rw rw rw rw rw rw rw
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
DCGREEN[7:0] DCBLUE[7:0]
rw rw rw rw rw rw rw rw rw
Bits 31:24 DCALPHA[7:0]: Default Color Alpha
These bits configure the default alpha value
Bits 23:16 DCRED[7:0]: Default Color Red
These bits configure the default red value
Bits 15:8 DCGREEN[7:0]: Default Color Green
These bits configure the default green value
Bits 7:0 DCBLUE[7:0]: Default Color Blue
These bits configure the default blue value
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