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参数资料
| 型号： | LM1246AAA/NA |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 3 CHANNEL, VIDEO PREAMPLIFIER, PDIP24 |
| 封装： | PLASTIC, DIP-24 |
| 文件页数： | 14/51页 |
| 文件大小： | 2794K |
| 代理商： | LM1246AAA/NA |
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OSD Generator Operation (Continued)
CHARACTER CELL
Each character is defined as a 12 column by 18 row matrix of
picture elements, or “pixels”. The character font is shown in
Figure 17 through Figure 24. There are two types of charac-
ters defined in the character ROM:
1.
Two-color: There are a total of 384 two-color characters
in 6 banks (banks 0, 1, 2, 4, 5 and 6). 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 0” or the “back-
ground” color. If the bit value is 1, then the color is
defined as “Color 1”, or the “foreground” color. An ex-
ample of a character is shown in Figure 17. The grid
lines are shown for clarity to delineate individual pixels
and are not part of the actual displayed character.
2.
Four-color: There are a total of 128 four-color charac-
ters, in two banks of 64 (banks 3 and 7). Each pixel of
the four-color character is defined by two bits of infor-
mation, and thus can define four different colors, Color
0, Color 1, Color 2 and Color 3. Color 0 is defined as the
“background” color. All other colors are considered “fore-
ground” 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 LM1247 internally
has a matrix of two planes of ROM as shown in Figure
18. In that figure, dark pixels indicate a logic “1” and light
pixels which indicate a logic “0”. The left side shows
plane 0 which is the least significant bit and the middle
figure shows plane 1 which is the most significant bit.
The right side composite character formed when each
pixel is represented by its two bits formed from the two
planes. The color palette used in this example is “00” for
white, “01” for black, “10” for blue and “11” for red.
3.
By appropriately selecting the color attributes, it is pos-
sible to have two 2-color characters in one four color
ROM location. If the required number of four color char-
acters is less than 128, the remaining characters can be
used to increase the number of two color characters
from 384 to 384 + 2*N, where N is the number of unused
four color characters. This is explained in the next
section.
FOUR COLOR FONT AS TWO 2-COLOR
Using a 4 color character as two 2 color characters is
achieved by careful assignment of the four colors. When two
2 color characters are combined, there will be four pixel
colors:
Color 0: Those
that
are
background
pixels
for
both
characters,
Color 1: Those that are foreground pixels in character one
20068530
FIGURE 17. Two-Color Character
20068531
FIGURE 18. Four-Color Character
LM1246
www.national.com
21
相关PDF资料 |
PDF描述 |
|---|---|
| LM1247AAG/NA/NOPB | 3 CHANNEL, VIDEO PREAMPLIFIER, PDIP24 |
| LM1253AAE/NA | ON-SCREEN DISPLAY IC, PDIP28 |
| LM1267NA/NOPB | 3 CHANNEL, VIDEO PREAMPLIFIER, PDIP24 |
| LM1269NA/NOPB | 3 CHANNEL, VIDEO PREAMPLIFIER, PDIP24 |
| LM1276AAA/NA | 1 CHANNEL, VIDEO PREAMPLIFIER, PDIP28 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 类别:集成电路 (IC) >> 线性 - 视频处理 系列:- 产品变化通告:Product Discontinuation 07/Mar/2011 标准包装:3,000 系列:OMNITUNE™ 类型:调谐器 应用:移动电话，手机，视频显示器 安装类型:表面贴装 封装/外壳:65-WFBGA 供应商设备封装:PG-WFSGA-65 包装:带卷 (TR) 其它名称:SP000365064 |
| LM1246NA | 制造商:NSC 制造商全称: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 制造商全称: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 类别:集成电路 (IC) >> 线性 - 视频处理 系列:- 产品变化通告:Product Discontinuation 07/Mar/2011 标准包装:3,000 系列:OMNITUNE™ 类型:调谐器 应用:移动电话，手机，视频显示器 安装类型:表面贴装 封装/外壳:65-WFBGA 供应商设备封装:PG-WFSGA-65 包装:带卷 (TR) 其它名称:SP000365064 |
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