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参数资料
| 型号： | LM1247AAG/NA/NOPB |
| 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： | 15/48页 |
| 文件大小： | 3141K |
| 代理商： | LM1247AAG/NA/NOPB |
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Microcontroller Interface (Continued)
LM1247 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 follow:
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, toa0to read the least
significant plane and toa1to read the most significant plane. See Table 4.
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.
20048439
FIGURE 24. I
2C Compatible Read Sequence
LM1247
www.national.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM1247DMC/NA | 制造商:Texas Instruments 功能描述: |
| LM124A | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Low Power Quad Operational Amplifiers |
| LM124AD | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:LOW POWER QUAD OPERATIONAL AMPLIFIERS |
| LM124ADR | 制造商:TI 制造商全称:Texas Instruments 功能描述:QUADRUPLE OPERATIONAL AMPLIFIERS |
| LM124ADT | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Voltage-Feedback Operational Amplifier |
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