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): 95/134頁
文件大?。?/td> 1000K
代理商: S1D13700
Epson Research and Development
Vancouver Design Center
Page 95
Hardware Functional Specification
Issue Date: 2004/01/06
S1D13700
X42A-A-001-00
Revision 1.0
12.5.4 Bi-directional Scrolling
Bi-directional scrolling can be performed only if the display memory is larger than the
physical screen in both the horizontal (REG[06h], REG[07h] > REG[03h]) and vertical
directions. Scrolling is normally done in single-character units, however the HDOT SCR
command (see REG[1Bh] bits 2-0) allows horizontal scrolling in pixel units (for text blocks
only). Single pixel horizontal scrolling can be performed using both the SCROLL and
HDOT SCR commands. For more information, see Section 15.3, “Smooth Horizontal
Scrolling” on page 116.
Note
In 2 bpp and 4 bpp grayscale mode REG[1Bh] bits 2-0 (HDOT SCR) must be set to 0, so
horizontal scrolling can only be done in single character units (not pixel units).
Figure 12-17 Bi-Directional Scrolling
BC
EFG
TUV
12
Before scrolling
After scrolling
Display memory
FG
TUV
1234
56
BC
EFG
TUV
A
34
567
89
12
ABC
E FG
TUV
56 7
89
1234
AP
C/R
Where:
AP = horizontal address range (REG[06h] bits 7-0, REG[07h] bits 7-0)
C/R = character bytes per row (REG[03h] bits 7-0)
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