Renesas SH7781 - Manual (Page 978)

19. Display Unit (DU)
Rev.1.00 Jan. 10, 2008 Page 948 of 1658
REJ09B0261-0100
P1
P1 P2 P3
Δ Δ Δ X X
P2 Δ Δ X Δ X
P3 Δ X Δ Δ X
P1
P1
P1
P1
P2
P2
P3
BPOR
P1
P1
P1 αP3
P1
P2 ⊕P3 P2 ⊕P3
P2
P3
BPOR
P1 αP2
P1 αP2
P1
P1
P2
P3
BPOR
P1 αP2
P1 αP2
P1 αP3
P1
P2
P2
P3
BPOR
P1(P2 ⊕P3)
P1 αP2
P1 αP3
P1
P2 ⊕P3
P2
P3
BPOR
Color palette selection Δ: Same color palette selected; X: Different color palette selected
Transparent color
Non-transparent color
Figure 19.7 Results of Display Combining Color Palette Selection and Transparent Colors
YC Data Contention: The display unit (DU) has only one YC-RGB conversion circuit internally,
and so YC-RGB conversion cannot be performed simultaneously for two or more planes. When
there are pixels requiring YC-RGB conversion on two or more planes simultaneously, the pixels
on the uppermost plane are YC-RGB converted, and the lower plane is not displayed.
Figure 19.8 describes YC-RGB conversion when the data for three planes is in YC format.
Plane 1 (YC data)
Plane 2 (YC data)
Plane 3 (YC data)
YC-RGB conversion plane Plane 1 Plane 1 Plane 1 Plane 2 Plane 3
Figure 19.8 YC Data Contention