SH7785 Datasheet, PDF (973/1692 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

19. Display Unit (DU)
19.4.9 Superpositioning of Planes
For each plane, three types of combined superpositioning are possible: α blending, transparent
colors, and EOR operations. By setting the PnSPIM bits in PnMR, the superpositioned display
type can be selected.
However, α blending and EOR operation cannot be performed simultaneously on the same plane.
α blending and EOR operations are performed after expanding the display data format into
RGB888 format.
Complementary formats for the different input display data formats are indicated in table 19.11.
α blending and EOR operations are performed in order from lower planes to higher planes. Figure
19.5 is a block diagram illustrating this procedure.
Table 19.10 Superpositioning
PnSPIM
000
001
010
011
100
101
110
111
Superpositioning
Transparency processing is performed for the specified plane.
When the specified plane is a transparent color, the lower plane is displayed.
(Initial value)
Blending of the specified plane with the lower plane is performed.
When the specified plane is a transparent color, blending is not performed and the
lower plane is displayed.
EOR operation of the specified plane and the lower plane is performed.
When the specified plane is a transparent color, EOR operation is not performed
and the lower plane is displayed.
Setting prohibited
Transparency processing is not performed for the specified plane.
The specified plane is displayed.
Blending of the specified plane with the lower plane is performed.
Transparent color specification for the specified plane is ignored, and blending of
all the pixels in the specified plane with the lower plane is performed.
EOR operation of the specified plane and the lower plane is performed.
Transparent color specification for the specified plane is ignored, and EOR
operation of all the pixels in the specified plane and the lower plane is performed.
Setting prohibited
Rev.1.00 Jan. 10, 2008 Page 943 of 1658
REJ09B0261-0100