參數(shù)資料
型號(hào)： SSD1905QT2
廠商： Electronic Theatre Controls, Inc.
英文描述： LCD Graphics Controller CMOS
中文描述： LCD圖形控制器的CMOS
文件頁數(shù)： 136/153頁
文件大?。?/td> 863K
代理商： SSD1905QT2
SSD1905
Rev 1.3
10/2002
SOLOMON
127
20 Hardware Cursor Mode
This mode enables two cursors on the main display window. The cursors can be positioned anywhere within the
display and are controlled through Cursor Mode registers (REG[C0h] through REG[111h]). Cursor support is
available only at 4/8/16-bpp display modes.
Each cursor pixel is 2-bit and the indexing scheme is as follows:
Table 20-1 : Indexing scheme for Hardware Cursor
Value
00
01
10
11
Content of color index 1 register
Content of color index 2 register
Content of color index 3 register
Color of Cursor 1 / Cursor 2
Transparent
(REG[E1h], REG[E0h] / REG[109h], REG[108h])
(REG[E5h], REG[E4h] / REG[10Dh], REG[10Ch])
(REG[E9h], REG[E8h] / REG[111h], REG[110h])
Three 16-bit color index registers (REG[E0h] through REG[111h]) have been implemented for each cursor. Only
the lower portion of the color index register is used in 4/8-bpp display modes. The LUT is bypassed and the color
data is directly mapped for 16-bpp display mode.
4 Bit-per-pixel
15
12
11
8
7
Don’t Care
8 Bit-per-pixel
15
12
11
8
7
Don’t Care
16 Bit-per-pixel (the index registers represents the 16-bit color component)
15
13
12
8
7
Green Component
Bits 2-0
Bits 4-0
The display precedence is Cursor1 > Cursor2 > Floating window > Main Window.
4
3
0
4-bit Color Index
4
3
0
8-bit Color Index
3
2
Green Component
Bits 5-3
0
Blue Component
Red Component
Bits 4-0
Main Window
Floating Window
Cursor 1
Cursor 2
Figure 20-1 : Display Precedence in Hardware Cursor
Note :
The maximum size for cursor is 32x32 pixels, while the minimum size varies for different color depths and display
orientations.
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