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參數資料
| 型號： | LM1246AAA/NA |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 3 CHANNEL, VIDEO PREAMPLIFIER, PDIP24 |
| 封裝： | PLASTIC, DIP-24 |
| 文件頁數： | 16/51頁 |
| 文件大小： | 2794K |
| 代理商： | LM1246AAA/NA |
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OSD Generator Operation (Continued)
parent’ or invisible. This allows the video information from
the PC system to be visible on the screen when this is
present. Note that this feature is enabled on any black color
in any of the first 8 attribute table entries.
HALF TONE TRANSPARENCY
In addition to the transparent disable bit, there is a half tone
disable bit. When the transparency is already in effect and
the half tone feature is activated, the contrast of the PC video
that is visible in the “transparent area” is reduced to 50%,
providing a semi-transparent effect. Just as in the conven-
tional transparency mode, half tone transparency is effective
on backgrounds or foregrounds with black color codes from
only the first 8 attribute table entries. This feature is con-
trolled by bit 7 of the frame control register, 0x8400, and is
only available when the transparency mode is already en-
abled.
OSD WINDOW FADE IN/ FADE OUT
The OSD window can be opened and closed with a fade
in/fade out effect. The interval for fading in and fading out the
OSD window in the horizontal and vertical direction is vari-
able and can be set by the microcontroller. This allows the
OSD window to be opened or closed in the vertical direc-
tions, horizontal direction, or from the upper left to lower right
corner. Assuming the desired time to typically complete a full
fade in or fade out is 0.5 seconds, and if the vertical scan
frequency is for example, 60 Hz, the number of steps is:
With a typical OSD window that is 300 pixels wide and 180
video lines long, the horizontal and vertical intervals would
be:
For a smooth fade in or fade out animation from the upper
left corner to the lower right corner, the horizontal to vertical
interval ratio must be matched to the aspect ratio of the OSD
window. In the example above, the 300 pixel wide by 180
lines long OSD window has an aspect ratio of 5:3. Thus, the
horizontal to vertical interval ratio should be set to 5/3 or
10/6. With an OSD window aspect ratio of 3:2, the H/V
intervals can be set to 3/2, 6/4, 9/6, 12/8, or 15/10 for optimal
operation. If the calculated aspect ratio of an OSD window is
a non-integer ratio, the H/V interval ratio should meet or
exceed the aspect ratio. For example, if the OSD aspect
ratio is 3.7:2 (or 1.85:1), the H/V intervals should be set to
2/1, 4/2, 6/3, 8/4, 10/5, or 12/6. The fade in/out speed
increases as H/V interval settings are increased. The OSD
window can also be faded in or out in only one direction if
desired, by setting the horizontal interval to 0 for fading in/out
strictly in the vertical direction or setting the vertical interval
to 0 for fading in/out in the horizontal direction. In interlaced
video formats, it is not recommended to fade in and fade out
the OSD in the vertical direction, and should be only faded in
the horizontal direction. The fade in/out function can be
enabled/disabled with bit 5 of the frame control register,
0x8400, and the horizontal & vertical intervals are controlled
by setting register 0x8429. The OSD window fade in/out
feature can only be used with OSD window 1.
ENHANCED FEATURES
In addition to the wide selection of colors for each character,
additional character features can be selected on a character
by character basis. There are 3 Enhanced Feature Regis-
ters, EF0, EF1 and EF2.
1.
Button Boxes — The OSD generator examines the char-
acter string being displayed and if the “button box” at-
tributes have been set in the Enhanced feature byte,
then a box creator selectively substitutes the character
pixels in either or both the top and left most pixel line or
column with a button box pixel. The shade of the button
box pixel depends upon whether a “depressed” or
“raised” box is required, and can be programmed
through the I
2C compatible interface. The raised pixel
color (“highlight”) is defined by the value in the color
palette register, EF1 (0x8405–0x8406), which is nor-
mally set to white. The depressed pixel (“lowlight”) color
by the value in the color palette register, EF2
(0x8407–0x8408), which is normally set to gray. See
effect.
2.
Heavy Button Boxes — When heavy button boxes are
selected, the color palette value stored in register EF3
(0x8409 - 0x840A) is used for the depressed (“lowlight”)
pixel color instead of the value in register EF2.
3.
Shadowing — Shadowing can be added to two-color
characters by choosing the appropriate attribute value
for the character. When a character is shadowed, a
shadow pixel is added to the lower right edges of the
color 1 image, as shown in Figure 23. The color of the
shadow is determined by the value in the color palette
register EF3, which is normally set to black.
4.
Bordering — A border can be added to the two-color
characters. When a character is bordered, a border pixel
is added at every horizontal, vertical or diagonal transi-
tion between color 0 and color 1. See Figure 24. The
color of the border is determined by the value in the color
palette register EF3 (normally black).
5.
Blinking — If blinking is enabled as an attribute, all colors
within the character except the button box pixels which
have been overwritten will alternately switch to color 0
and then back to the correct color at a rate determined
by the microcontroller through the I
2C compatible
interface.
LM1246
www.national.com
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| LM1253AAE/NA | ON-SCREEN DISPLAY IC, PDIP28 |
| LM1267NA/NOPB | 3 CHANNEL, VIDEO PREAMPLIFIER, PDIP24 |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LM1246AAC/NA | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述:IC 150MHZ RGB PREAMP 1246 DIP24 |
| LM1246AAC/NA/NOPB | 功能描述:IC PREAMP RGB 150MHZ 24-DIP RoHS:是 類別:集成電路 (IC) >> 線性 - 視頻處理 系列:- 產品變化通告:Product Discontinuation 07/Mar/2011 標準包裝:3,000 系列:OMNITUNE™ 類型:調諧器 應用:移動電話，手機，視頻顯示器 安裝類型:表面貼裝 封裝/外殼:65-WFBGA 供應商設備封裝:PG-WFSGA-65 包裝:帶卷 (TR) 其它名稱:SP000365064 |
| LM1246NA | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:150 MHz I2C Compatible RGB Preamplifier with Internal 512 Character OSD ROM, 512 Character RAM and 4 DACs |
| LM1247 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:150 MHz I2C Compatible RGB Preamplifier with Internal 512 Character OSD ROM, 512 Character RAM and 4 DACs |
| LM1247AAG/NA | 功能描述:IC PREAMP CMOS 150MHZ 24DIP RoHS:否 類別:集成電路 (IC) >> 線性 - 視頻處理 系列:- 產品變化通告:Product Discontinuation 07/Mar/2011 標準包裝:3,000 系列:OMNITUNE™ 類型:調諧器 應用:移動電話，手機，視頻顯示器 安裝類型:表面貼裝 封裝/外殼:65-WFBGA 供應商設備封裝:PG-WFSGA-65 包裝:帶卷 (TR) 其它名稱:SP000365064 |
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