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S1D13706F00A Datasheet(PDF) 85 Page - Epson Company |
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S1D13706F00A Datasheet(HTML) 85 Page - Epson Company |
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85 / 94 page  S1D13305 Series EPSON 79 Technical Manual 16.4. Smooth Horizontal Scrolling Figure 63 illustrates smooth display scrolling to the left. When scrolling left, the screen is effectively moving to the right, over the larger virtual screen. Instead of changing the display start address SAD and shifting the display by eight pixels, smooth scrolling is achieved by repeatedly changing the pixel-shift param- eter of the HDOT SCR command. When the display has been scrolled seven pixels, the HDOT SCR pixel-shift parameter is reset to zero and SAD incremented by one. Repeating this operation at a suitable rate gives the appearance of smooth scrolling. To scroll the display to the right, the reverse procedure is followed. When the edge of the virtual screen is reached, the microprocessor must take appropriate steps so that the display is not corrupted. The scroll must be stopped or the display modified. Note that the HDOT SCR command cannot be used to scroll individual layers. Figure 63. HDOT SCR example Display AP AP P1 = 00H P1 = 01H P1 = 02H P1 = 03H P1 = 07H P1 = 00H HDOT SCR parameter SAD SAD + 1 SAD + 2 SAD = SAD + 1 SAD = SAD Not visible Visible C/R Virtual screen Magnified Note: The response time of LCD panels changes considerably at low temperatures. Smooth scrolling under these conditions may make the display difficult to read. APPLICATION NOTES |
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