SH7205 Datasheet, PDF (1406/1904 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7200 Series

Section 26 2D Graphics Engine (2DG)
• This register is valid only when the chromakey function has been selected (SBSEL in
GR_BLTMODE = 01)
• This register value is used differently depending on the CRKEY bits in GR_BLTMODE:
When CRKEY = 01: The target color specified in this register is replaced with the replacement
color specified in GR_BRDCOL for the SB input data.
When CRKEY = 10: The target color specified in this register is blended with the replacement
color specified in GR_BRDCOL for the SB input data.
26.3.22 Replacement Color Data Register for Blitter Blending (GR_BRDCOL)
The register GR_BRDCOL is used for chromakey processing and color gradation processing. In
chromakey processing, the color specified in this register replaces or is blended with the target
color. In color gradation processing, the color specified in this register is used as the replacement
color. Since chromakey processing and color gradation processing are performed after format
conversion, the data should be specified as 5 bits of BRDC_R (R data), 5 bits of BRDC_G (G
data) and 5 bits of BRDC_B (B data).
Bit: 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
-
-
-
-
BRDC_A
-
-
-
BRDC_R
Initial value: -
-
-
-
0
0
0
0
-
-
-
0
0
0
0
0
R/W: R
R
R
R R/W R/W R/W R/W R
R
R R/W R/W R/W R/W R/W
Bit: 15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
-
-
-
BRDC_G
-
-
-
BRDC_B
Initial value: -
-
-
0
0
0
0
0
-
-
-
0
0
0
0
0
R/W: R
R
R R/W R/W R/W R/W R/W R
R
R R/W R/W R/W R/W R/W
Bit
Bit name
31 to 28 
27 to 24 BRDC_A
23 to 21 
Initial
Value
R/W
Undefined R
0000
R/W
Undefined R
Description
Reserved
The read value is undefined. The write value should
always be 0.
Blending Replacement Color Data (α)
These bits set the replacement color (α) = αsasg for
blending
Reserved
The read value is undefined. The write value should
always be 0.
Rev. 1.00 Mar. 25, 2008 Page 1374 of 1868
REJ09B0372-0100