SH7764 Datasheet, PDF (1282/1752 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC Engine Family SH-4A Series

Section 24 Video Display Controller (VDC2)
24.5 Functional Descriptions
24.5.1 Graphics (Layers 1 to 4)
The graphics blocks display in the RGB565 (16-bit) format the image data stored in the memory
area. The graphics blocks control display by using the external input sync signals or internally
generated sync signals. A single plane of an image can be displayed, and two to four planes of
images can also be displayed through overlay processing. In overlaid display, the lower-layer
images can be displayed through the current image (current layer) by specifying the α control area
for the current layer (transparent processing). The transparency can be specified in 1/256 × 100%
units. Transparent processing for the lower-layer images is also available through chroma-keying,
which specifies the transparency of the specified target color. Figure 24.2 shows examples of
overlaid display.
Graphics block 1: Layer 1 (lower layer)
Graphics block 2: Layer 2 (current layer)
α control area
Layers 1 and 2 can be
α-blended by specifying
an alpha control area
in the graphic image area.
Example 1: Output of Graphics Block 2 (Overlaid Display of Layers 1 and 2)
Graphics block 2 output: Layers 1 and 2 overlaid (lower layers)
ABC, MPG
Graphics block 3: Layer 3 (current layer)
ABC, MPG
2007/1/1
2007/1/1
Chroma-key target color
The transparency of
the chroma-key target color
of layer 3 can be set to
100% through chroma-keying
(a desired transparency
can be specified).
Example 2: Output of Graphics Block 3 (Overlaid Display of Layers 1 to 3)
Figure 24.2 Examples of Overlaid Display
Rev. 1.00 Nov. 22, 2007 Page 1226 of 1692
REJ09B0360-0100