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參數資料
| 型號： | LM1276AAA/NA |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1 CHANNEL, VIDEO PREAMPLIFIER, PDIP28 |
| 封裝： | PLASTIC, DIP-28 |
| 文件頁數： | 17/50頁 |
| 文件大小： | 6075K |
| 代理商： | LM1276AAA/NA |
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LM1276 Address Map
CHARACTER ROM
The 512 font characters from 0x0000 to 0x7FFF can be read from ROM by addressing the individual pixel rows of the desired
character. Since the characters have 12 columns, it takes two bytes to read a given row of pixels within one character. Since the
characters have 18 rows, a total of 36 bytes are needed to read the entire character. The 16-bit address for reading a row of pixels
is formed as follows:
Address = (N * 0x1000) + (I * 0x40) + (R * 0x02) + H
where:
N = bank number (0x0
≤ N ≤ 0x7)
I = Character Index within its respective bank (0x00
≤ I ≤ 0x3F)
R = row of pixels within the character (0x00
≤ R ≤ 0x11)
H = 0 for low byte, 1 for high byte
Note that bit 0 of the Character Font Access Register, 0x8402, needs to be set to 0 to read the 2-color fonts. In order to read the
four-color fonts, two complete reads are needed. Set bit 0 of the Character Font Access Register, 0x8402, to a 0 to read the least
significant plane and to a 1 to read the most significant plane. See Table 3.
TABLE 3. 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 4.
TABLE 4. Character ROM Read Data
Register
Address
D7
D6
D5
D4
D3
D2
D1
D0
Fonts - 2 Color
0x0000–0x2FFE
PIXEL[7:0]
+1
X
PIXEL[11:8]
Fonts - 4 Color
0x3000–0x3FFE
PIXEL[7:0]
+1
X
PIXEL[11:8]
Fonts - 2 Color
0x4000–0x6FFE
PIXEL[7:0]
+1
X
PIXEL[11:8]
Fonts - 4 Color
0x7000–0x7FFE
PIXEL[7:0]
+1
X
PIXEL[11:8]
Display Page
0x8000–0x83FF
X
CHAR_CODE[7:4] or
reserved
CHAR_CODE[3:0] or
ATTR_CODE
DISPLAY PAGE RAM
Full 512 Displayable Character Access
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 be-
havior, this range should be cleared by writing a 0 to bit 3 of the FRMCTRL1 Register, 0x8400, immediately after power up. There
may also be one or more pairs of End-Of-Line and Skip Line codes. The character code is 9 bits long. The codes and characters
www.national.com
24
200969 Version 2 Revision 4
Print Date/Time: 2011/07/11 11:20:12
LM1276
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LM1279 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:110 MHz RGB Video Amplifier System with OSD |
| LM12791DL WAF | 制造商:Texas Instruments 功能描述: |
| LM1279A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| LM1279AN | 功能描述:IC AMP RGB VIDEO SYSTEM 20-DIP RoHS:否 類別:集成電路 (IC) >> 線性 - 放大器 - 視頻放大器和頻緩沖器 系列:- 標準包裝:1,000 系列:- 應用:驅動器 輸出類型:差分 電路數:3 -3db帶寬:350MHz 轉換速率:1000 V/µs 電流 - 電源:14.5mA 電流 - 輸出 / 通道:60mA 電壓 - 電源，單路/雙路(±):5 V ~ 12 V，±2.5 V ~ 6 V 安裝類型:表面貼裝 封裝/外殼:20-VFQFN 裸露焊盤 供應商設備封裝:20-QFN 裸露焊盤（4x4） 包裝:帶卷 (TR) |
| LM1279DL WAF | 制造商:Texas Instruments 功能描述: |
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