r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 982

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

19. Display Unit (DU)
19.4.14 Upper-Left Overflow Display
For each plane, a display start position in memory (PnSPXR, PnSPYR) and display size
(PnDSXR, PnDSYR) can be set arbitrarily, so that by combining and using these registers, areas
overflowing the upper-left relative to the monitor origin (upper-left corner) can be displayed
without overwriting display data in memory.
For a picture of size (DSX, DSY) and with start position (SPX, SPY), by setting the size to (DSX-
ΔX, DSY-ΔY) and the start position to (SPX+ΔX, SPY+ΔY), the ΔX part overflowing on the left
side and the ΔY part overflowing on top can be displayed. At this time, the display position
(PnDPXR, PnDPYR) is fixed at 0.
Rev.1.00 Jan. 10, 2008 Page 952 of 1658
REJ09B0261-0100
Display area start address
SPX + ΔX
SPX
Figure 19.11 Schematic Diagram of Upper-Left Overflow Display
Display data in memory
SPY
DSX
DSX - ΔX
SPY + ΔY
DSY
DSY - ΔY
ΔX
Monitor origin
(DPX,DPY)=(0,0)
DSX - ΔX
(DPX,DPY)=(0,0)
DSX
Monitor screen
Monitor
Monitor
DSY - ΔY
ΔY
DSY
Overflow display