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参数资料
| 型号： | LM1253AAE/NA |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 画面叠加 |
| 英文描述： | ON-SCREEN DISPLAY IC, PDIP28 |
| 封装： | 0.600 INCH, PLASTIC, DIP-28 |
| 文件页数： | 17/61页 |
| 文件大小： | 1671K |
| 代理商： | LM1253AAE/NA |
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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
internally 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
characters 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.
2.
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
define 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.
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
LM1253A
www.national.com
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相关PDF资料 |
PDF描述 |
|---|---|
| LM1267NA/NOPB | 3 CHANNEL, VIDEO PREAMPLIFIER, PDIP24 |
| LM1269NA/NOPB | 3 CHANNEL, VIDEO PREAMPLIFIER, PDIP24 |
| LM1276AAA/NA | 1 CHANNEL, VIDEO PREAMPLIFIER, PDIP28 |
| LM1279AN/NOPB | 3 CHANNEL, VIDEO AMPLIFIER, PDIP20 |
| LM1279N/NOPB | 1 CHANNEL, VIDEO AMPLIFIER, PDIP20 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LM1253AN | 制造商:NSC 制造商全称: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 制造商全称:Rohm 功能描述:16 x 16 matrix displays |
| LM-1256_1 | 制造商:ROHM 制造商全称:Rohm 功能描述:16】16 matrix displays |
| LM-1256LB1 | 制造商:ROHM 制造商全称:Rohm 功能描述:16】16 matrix displays |
| LM125AN | 制造商:NSC 制造商全称:National Semiconductor 功能描述:VOLTAGE REGULATORS |
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