Samsung S3C2451X User Manual page 584

LCD CONTROLLER
Win1 Color Key 0 Register
Register
W1KEYCON0 0x4C8000B0
W1KEYCON0 Bit
KEYBLEN [26]
KEYEN_F [25]
DIRCON [24]
COMPKEY [23:0] Each bit is correspond to the COLVAL[23:0].
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
22-44
Specifications and information herein are subject to change without notice.
Address R/W
R/W Color key control register
Alpha value control for Key area or Non-Key area
0 = Alpha value selected by AEN bit in frame buffer
1 = Alpha value selected by below area
Non-Key area : ALPHA0_R/G/B
Key area
Note: This bit is meaningful when BLD_PIX is 1 and ALPHA_SEL is 0.
Color Key (Chroma key ) Enable control
0 = Color key disable
1 = Color key enable
Color key (Chroma key) direction control
0 = If the pixel value match fore-ground image with COLVAL, pixel
from back-ground image is displayed ( only in OSD area)
1 = If the pixel value match back-ground with COLVAL, pixel from
fore-ground image is displayed ( only in OSD area)
If some position bit is set then that position bit of COLVAL will be
disabled.
Description
Description
: ALPHA1_R/G/B
S3C2451X RISC MICROPROCESSOR
Reset Value
0x0000_0000
Initial state
0
0
0
0