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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： | 20/51頁 |
| 文件大小： | 2794K |
| 代理商： | LM1246AAA/NA |
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LM1246 Address Map (Continued)
TABLE 4. Character ROM Addressing
Address Range
R/W
Description
0x8402[0]
N
0x0000–0x2FFF
R
These are the first 3 banks of two-color, read-only ROM character
fonts. There are 192 total characters in this range.
0
0x0
0x1
0x2
0x3000–0x3FFF
R
This is bank 3 of four-color, read-only ROM character fonts. There
are 64 total characters in this range.
0/1
0x3
0x4000–0x6FFF
R
These are banks 4, 5 and 6 of two-color, read-only ROM character
fonts. There are 192 characters in this range.
0
0x4
0x5
0x6
0x7000–0x7FFF
R
This is bank 7 of four-color, read-only ROM character fonts. There
are 64 total characters in this range.
0/1
0x7
When read back, the low byte will contain the first eight pixels of the row with data bit 0 corresponding to the left most bit in the
pixel row. The high byte will contain the remaining four pixels in the least significant nibble. The remaining 4 bits, shown as “X”,
are “don’t care” bits, and should be discarded. Bit 3 of the high byte corresponds to the right most pixel in the pixel row. This is
shown in Table 5. Character ROM Read Data.
TABLE 5. Character ROM Read Data
Register
Address
D7
D6
D5
D4
D3
D2
D1
D0
Fonts - 2 Color
0x0000–0x2FFE
PIXEL[7:0]
+1
XXXX
PIXEL[11:8]
Fonts - 4 Color
0x3000–0x3FFE
PIXEL[7:0]
+1
XXXX
PIXEL[11:8]
Fonts - 2 Color
0x4000–0x6FFE
PIXEL[7:0]
+1
XXXX
PIXEL[11:8]
Fonts - 4 Color
0x7000–0x7FFE
PIXEL[7:0]
+1
XXXX
PIXEL[11:8]
Display Page
0x8000–0x83FF
X
CHAR_CODE[7:4] or
reserved
CHAR_CODE[3:0] or
ATTR_CODE
DISPLAY PAGE RAM
Standard 1247 Mode
This address range (0x8000–0x81FF) contains the 512 characters, which comprise the displayable OSD screens. There must be
at least one End-Of-Screen code (0x00) in this range to prevent unpredictable behavior. NOTE: To avoid any unpredictable
behavior, this range should be cleared by writinga0tobit3ofthe FRMCTRL1 Register, 0x8400, immediately after power up.
There may also be one or more pairs of End-Of-Line and Skip Line codes. The codes and characters are written as 8-bit bytes,
but are stored with their attributes in groups of 13 bits. When writing, one byte describes a displayed character (CC), Attribute
Code (AC), End-Of-Screen (EOS), End-Of-Line (EOL) or Skip Line (SL) code.
Full 512 Displayable Character Mode
This mode differs from the above in that the character code is 9 bits long; the attribute code is still 4 bits long, and so the 13-bit
wide Page RAM of the LM1246 is fully utilized. The codes and characters are still written as 8-bit bytes, but are stored with their
attributes in groups of 13 bits.
When reading characters from RAM, bit 1 of the Character Font Access Register (0x8402) determines whether the lower 8 bits
or upper 5 bits of the Page RAM are returned. Table 6. Page RAM Lower Byte Read Data gives the lower byte read, which is the
first 8 character code bits when bit 1 of the Character Font Access Register is a 0. Table 7. Page RAM Upper Byte Read Data
gives the upper byte read, which is the 9th character code bit and 4 attribute code bits when this bit is set to a 1.
TABLE 6. Page RAM Lower Byte Read Data
Address Range
D7
D6
D5
D4
D3
D2
D1
D0
0x8000–0x81FF
CHAR_CODE[7:0]
TABLE 7. Page RAM Upper Byte Read Data
Address
D7
D6
D5
D4
D3
D2
D1
D0
0x8000–0x81FF
X
CC[8]
ATTR_CODE[3:0]
LM1246
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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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