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參數(shù)資料
型號(hào)： LM1253AAE/NA
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 畫(huà)面疊加
英文描述： ON-SCREEN DISPLAY IC, PDIP28
封裝： 0.600 INCH, PLASTIC, DIP-28
文件頁(yè)數(shù)： 17/61頁(yè)
文件大小： 1671K
代理商： LM1253AAE/NA
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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相關(guān)PDF資料
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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