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參數資料
| 型號： | LM1253AN |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 畫面疊加 |
| 英文描述： | Monolithic Triple 180 MHz I2C CRT Pre-amp With Integrated Analog On Screen Display (OSD) Generator |
| 中文描述： | ON-SCREEN DISPLAY IC, PDIP28 |
| 封裝： | 0.600 INCH, PLASTIC, DIP-28 |
| 文件頁數： | 29/57頁 |
| 文件大?。?/td> | 1621K |
| 代理商： | LM1253AN |
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LM1253A Address Map
TABLE 3. Character ROM Address Map
Address
Range
CHARACTER ROM
0000h–2FFFh
R/W
Description
R
ROM Character Fonts, 190 two-color Character Fonts that are read-only.
The format of the address is as follows:
A15–A14: Always zeros.
A13–A6: Character value (00h–BFh are valid values)
A5–A1: Row of the character (00h–11h are valid values)
A0: Low byte of line when a zero. High byte of line when a one.
The low byte will contain the first eight pixels of the line with data Bit 0 corresponding to the left
most bit in the Character Font line. The high byte will contain the last four pixels and data Bits
7–4 are “don’t cares”. Data Bit 3 of the high byte corresponds to the right most pixel in the
Character Font line.
ROM Character Fonts, 64 four-color Character Fonts that are read-only.
The format of the address is as follows:
A15–A14: Always zeros.
A13–A6: Character value (C0h–FFh are valid values)
A5–A1: Row of the character (00h–11h are valid values)
A0: Low byte of line when a zero. High byte of line when a one.
The low byte will contain the first eight pixels of the line with data Bit 0 corresponding to the left
most bit in the Character Font line. The high byte will contain the last four pixels and data Bits
7–4 are “don’t cares”. Data Bit 3 of the high byte corresponds to the right most pixel in the
Character Font line.
NOTE: The value of Bit 0 of the Character Font Access Control Register (I
2
C Address 8402h) is a
zero, it indicates that the Bit 0 data value of the four-color pixels is being accessed via these
addresses. When the value of Bit 0 of the Access Control Register is a one, it indicates that the
Bit 1 data value of the four-color pixel is being accessed via these addresses.
RESERVED.
3000h–3FFFh
R
4000h–7FFFh
TABLE 4. Display Page RAM Address Map
Address
Range
DISPLAY PAGE RAM
8000h–81FF
R/W
Description
R/W
Display Page RAM Characters. A total of 512 display characters, skipped line, end-of-row and
end-of-window character codes may be supported via this range.
To support skipped lines and character attributes a number of special case rules are used when
writing to this range. (Refer to the Display Page RAM section of this document for more details.)
L
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