r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 981

• Manufacturer Part Number: r8a77850anbg
• Description: Renesas 32-bit Risc Microcomputer Superh? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

19.4.13 Wraparound Display
In addition to display scrolling, wrap-around display, which can be used in spherical scrolling, is
possible for each plane. When enabling wrap-around display, the PnWAE bit in PnMR is set. As a
result of changing the plane n display start position X, Y (the plane n start position X set in
PnSPXR and the plane n start position Y set in PnSPYR) in order to scroll the display, even when
plane n overflows the wrap-around area, the wrap-around area is seen as a spherical surface in
wrap-around display, as in figure 19.10, and the part overflowing is complemented and displayed.
The method used to specify the wrap-around area is described below.
1. The leading address of the memory used for plane n is specified in PnDSA0R and PnDSA1R.
2. With the beginning of the specified memory as origin, the upper-left coordinates of the wrap-
3. The Y-direction width of the wrap-around area is set in PnWAMWR.
Note: When wrap-around display is disabled (when the PnWAE bit in PnMR is 0), the part
around area are specified in PnWASPR. The X-direction width of the wrap-around area is the
memory width set in PnMWR.
overflowing the wrap-around area becomes the color specified by BPOR, and
superposition processing using this color is performed.
Plane n wrap-around start position
Plane n display area start address
4
2
Figure 19.10 Schematic Diagram of Wraparound Display
3
Plane n display start position
Memory width
Plane n display start position
1
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Wrap-around
memory width Y
Wrap-around display
1
3
19. Display Unit (DU)
2
4
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