S1D13700F01 Epson Electronics America, Inc., S1D13700F01 Datasheet - Page 116
S1D13700F01
Manufacturer Part Number
S1D13700F01
Description
Embedded Memory Graphics Lcd Controller
Manufacturer
Epson Electronics America, Inc.
Datasheet
1.S1D13700F01.pdf
(133 pages)
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15.2 System Overview
15.3 Smooth Horizontal Scrolling
S1D13700F01
X42A-A-002-04
Note
Note
Note
Section 3, “System Diagrams” on page 10 shows some typical S1D13700F01 implementa-
tions where the microprocessor issues instructions to the S1D13700F01, and the
S1D13700F01 drives the LCD panel. Since the S1D13700F01 integrates all required LCD
control circuits, minimal external components are required to construct a complete
medium- resolution liquid crystal display solution.
The S1D13700F01 supports smooth horizontal scrolling to the left as shown in Figure 15-5
“HDOT SCR Example,” on page 117. When scrolling left, the screen is effectively moving
to the right over the larger virtual screen.
Instead of changing the screen block start address (SADx) and shifting the display by eight
pixels, smooth scrolling is achieved by repeatedly changing the horizontal pixel scroll
parameter of the HDOT SCR command (REG[1Bh] bits 2-0). When the display has been
scrolled seven pixels, the horizontal pixel scroll parameter is reset to zero and screen block
start address is incremented by one. Repeating this operation at a suitable rate gives the
appearance of smooth scrolling.
When the edge of the virtual screen is reached, the microprocessor must take appropriate
steps to avoid corrupting the display. For example, scrolling must be stopped or the display
must be modified.
To scroll the display to the right, the procedure is reversed.
The HDOT SCR command cannot be used to scroll individual layers.
When in 2 bpp or 4 bpp mode, smooth horizontal scrolling in pixel units is not support-
ed.
Revision 4.05
Epson Research and Development
Hardware Functional Specification
Vancouver Design Center
Issue Date: 2005/12/13
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