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參數(shù)資料
| 型號(hào)： | LM1253A |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Monolithic Triple 180 MHz I2C CRT Pre-amp With Integrated Analog On Screen Display (OSD) Generator |
| 中文描述： | 單片三180兆赫的I2C顯像管預(yù)先集成在屏幕顯示（OSD）發(fā)生器模擬放大器 |
| 文件頁數(shù)： | 24/57頁 |
| 文件大?。?/td> | 1621K |
| 代理商： | LM1253A |
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OSD Generator Operation
(Continued)
OSD Video Timing
The OSD SELECT signal switches the source of video infor-
mation within the preamplifier from external video to the in-
ternally generated OSD video.
Windows
Two separate windows can be opened, utilizing the data
stored in the page RAM. Each window has its own horizontal
and vertical start position, although the second window
should be horizontally spaced at least two character spaces
away from the first window, and should never overlap the
first window when both windows are on. The OSD window
must be placed within the active video.
Character Cell
Each character is defined as a 12 wide by 18 high matrix of
picture elements, or ‘pixels’. The character font is shown in
Figures 45, 46, 47, 48, 49, 50 There are two types of char-
acters defined in the character ROM:
1.
Two-color: There are 190 two-color characters. Each
pixel of these characters is defined by a single bit value.
If the bit value is 0, then the color is defined as ‘Color 1’
or the ‘background’ color. If the bit value is 1, then the
color is defined as ‘Color 2’, or the ‘foreground’ color. An
example of a character is shown in Figure 34
Four-color: There are 64 four-color characters stored in
the character ROM. Each pixel of the four-color charac-
ter is defined by two bits of information, and thus can de-
fine four different colors, Color 1, Color 2, Color 3, and
Color 4. Color 1 is defined as the ‘background’ color. All
other colors are considered ‘foreground’ colors, although
for most purposes, any of the four colors may be used in
any way. Because each four-color character has two
bits, the LM1253A internally has a matrix of two planes
of ROM as shown in Figure 35
2.
12 columns
18 rows
COLOR 1
COLOR 2
DS101265-38
FIGURE 34. A Two-Color Character
Plane 1
+
Plane 2
=
Composite
DS101265-39
FIGURE 35. A Four-Color Character
L
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM1253AN | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Monolithic Triple 180 MHz I2C CRT Pre-amp With Integrated Analog On Screen Display (OSD) Generator |
| LM-1256 | 制造商:ROHM 制造商全稱:Rohm 功能描述:16 x 16 matrix displays |
| LM-1256_1 | 制造商:ROHM 制造商全稱:Rohm 功能描述:16】16 matrix displays |
| LM-1256LB1 | 制造商:ROHM 制造商全稱:Rohm 功能描述:16】16 matrix displays |
| LM125AN | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:VOLTAGE REGULATORS |
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