參數(shù)資料
型號: S1D13700
廠商: 愛普生(中國)有限公司
英文描述: Embedded Memory Graphics LCD Controller
中文描述: 嵌入式內(nèi)存圖形液晶顯示控制器
文件頁數(shù): 116/134頁
文件大小: 1000K
代理商: S1D13700
Page 116
Epson Research and Development
Vancouver Design Center
S1D13700
X42A-A-001-00
Hardware Functional Specification
Issue Date: 2004/01/06
Revision 1.0
15.2 System Overview
Section 3, “System Diagrams” on page 14 shows some typical S1D13700 implementations
where the microprocessor issues instructions to the S1D13700, and the S1D13700 drives
the LCD panel. Since the S1D13700 integrates all required LCD control circuits, minimal
external components are required to construct a complete medium- resolution liquid crystal
display solution.
15.3 Smooth Horizontal Scrolling
The S1D13700 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.
Note
To scroll the display to the right, the procedure is reversed.
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.
Note
The HDOT SCR command cannot be used to scroll individual layers.
Note
When in 2 bpp or 4 bpp mode, smooth horizontal scrolling in pixel units is not support-
ed.
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