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參數(shù)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(shù)： | 25/51頁 |
| 文件大小： | 2794K |
| 代理商： | LM1246AAA/NA |
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LM1246 Address Map (Continued)
Address = 0x8440 + (N * 0x4) + B
where: N = Attribute number (0x0
≤ N ≤ 0xF)
B = Attribute byte number (0x0
≤ B ≤ 0x3)
When reading, it is OK to read only one, two, or all three bytes. When writing more than one 2-color attribute using the auto
increment feature, all four bytes must be written. When writing, bytes 0 through 2 must be written in order. Bytes 0 through 2 will
take effect after byte 2 is written. Since byte 3 contains all reserved bits, this byte may be written, but will have no effect. Any bits
marked as “X” are reserved and should be written to with zeros and should be ignored when the register is read.
TABLE 16. LM1246 Two-Color Attribute Registers
Register
Address
D7
D6
D5
D4
D3
D2
D1
D0
ATT2C0n
0x8440 + 4n
C0B[1:0]
C0G[2:0]
C0R[2:0]
ATT2C1n
+1
C1B[0]
C1G[2:0]
C1R[2:0]
C0B[2]
ATT2C2n
+2
X
EF[3:0]
C1B[2:1]
ATT2C3n
+3
X
XXXXX
FOUR-COLOR ATTRIBUTE RAM
This address range (0x8500–0x857F), contains the attribute lookup tables used for displaying four-color characters. There are 16
groups of 8 bytes each according to the format shown in Table 17. LM1246 Four-Color Attribute Registers. The attributes are
stored starting with Color 0 (background) and each color is stored red first, green second and then blue. They may be written or
read using the following address format:
Address = 0x8500 + (N * 0x8) + B
where: N = Attribute number (0x0
≤ N ≤ 0xF)
B = Attribute byte number (0x0
≤ B ≤ 0x7)
When writing, bytes 0 through 2 must be written in order and bytes 4 through 6 must be written in order. Bytes 0 through 2 will
take effect after byte 2 is written. Bytes 4 through 6 will take effect after byte 6 is written. Since bytes 5 and 7 contain all reserved
bits, these bytes may be written, but no effect will result. When reading, it is OK to read only one, two, or all three bytes. If writing
more than one 4-color attributes using the auto increment feature, all eight bytes must be written. Any bits marked as “X” are
reserved and should be written to with zeros and should be ignored when the register is read.
TABLE 17. LM1246 Four-Color Attribute Registers
Register
Address
D7
D6
D5
D4
D3
D2
D1
D0
ATT4C0n
8500 + (n*8)
C0B[1:0]
C0G[2:0]
C0R[2:0]
ATT4C1n
+1
C1B[0]
C1G[2:0]
C1R[2:0]
C0B[2]
ATT4C2n
+2
X
EF[3:0]
C1B[2:1]
ATT4C3n
+3
X
XXXXX
ATT4C4n
+4
C2B[1:0]
C2G[2:0]
C2R[2:0]
ATT4C5n
+5
C3B[0]
C3G[2:0]
C3R[2:0]
C2B[2]
ATT4C6n
+6
X
C3B[2:1]
ATT4C7n
+7
X
XXXXX
Building Display Pages
THE OSD WINDOW
The Display Page RAM contains all of the 9-bit display
character codes and their associated 4-bit attribute codes,
and the special 13-bit page control codes — the End-Of-Line,
Skip-Line parameters and End-Of-Screen characters. The
LM1246 has a distinct advantage over many OSD Genera-
tors in that it allows variable size and format windows. The
window size is not dictated by a fixed geometric area of
RAM. Instead, 512 locations of 13-bit words are allocated in
RAM for the definition of the windows, with special control
codes to define the window size and shape.
Window width can be any length supported by the number of
pixels per line that is selected divided by the number of
pixels in a character line. It must be remembered that OSD
characters displayed during the monitor blanking time will
not be displayed on the screen, so the practical limit to the
number of horizontal characters on a line is reduced by the
number of characters within the horizontal blanking period.
The EOS code tells the OSD generator that the character
codes following belong to another displayed window at the
next window location. An EOS code may follow normal char-
acters or an SL code, but never an EOL control code,
because EOL is always followed by an AC plus an SL code.
WRITING TO THE PAGE RAM
The Display Page RAM can contain up to 512 of the above
listed characters and control codes. Each character, or con-
trol code will consume one of the possible 512 locations. For
convenience, a single write instruction to bit 3 of the Frame
Control Register (0x8400) can reset the page RAM value to
all zero. This should be done at power up to avoid unpre-
dictable behaviour.
Display Window 1 will also start at the first location (corre-
sponding to the I
2C address 0x8000). This location must
LM1246
www.national.com
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|---|---|
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| 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 |
相關代理商/技術參數(shù) |
參數(shù)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(chǎn)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(chǎn)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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