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參數(shù)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(shù)： | 48/57頁 |
| 文件大?。?/td> | 1621K |
| 代理商： | LM1253AN |
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Control Register Definitions
(Continued)
Bits 21–18
1010b
1011b
1100b
1101b
1110b
1111b
Description
Depressed Box.
Blinking and Depressed Box.
Heavy Raised Box.
Blinking and Heavy Raised Box.
Heavy Depressed Box.
Blinking and Heavy Depressed Box.
Bits 40–32:
Color 3. These nine bits indicate the value of the color to be displayed as Color 3. This is displayed when the cor-
responding pixel data bit is 10b.
Color 4. These nine bits indicate the value of the color to be displayed as Color 4. This is displayed when the cor-
responding pixel data bit is 11b.
RESERVED.
Bits 49–41:
Bits 63–50:
ATTRIBUTE TABLES TO I
2
C ADDRESS
TABLE 13. Attribute Tables To I
2
C Address
Two-Color
Attribute Table
I
2
C Address
8440h–8443h
8444h–8447h
8448h–844Bh
844Ch–844Fh
Four-Color
Attribute Table
I
2
C Address
8500h–8507h
8508h–850Fh
8510h–8517h
8518h–851Fh
Attribute Value
0000b
0001b
0010b
0011b
0100b
0101b
0110b
0111b
8450h–8453h
8454h–8457h
8458h–845Bh
845Ch–845Fh
8520h–8527h
8528h–852Fh
8530h–8537h
8538h–853Fh
1000b
1001b
1010b
1011b
8460h–8463h
8464h–8467h
8468h–846Bh
846Ch–846Fh
8540h–8547h
8548h–854Fh
8550h–8557h
8558h–855Fh
1100b
1101b
1110b
1111b
8470h–8473h
8474h–8477h
8478h–847Bh
847Ch–847Fh
8560h–8567h
8568h–856Fh
8570h–8577h
8578h–857Fh
Button Box Formation
The value of the most significant Enhanced Feature Bit (EFB3) determines when to draw the left, right, bottom and top sides of
a Box. EFB1 denotes whether a box is raised or depressed, and EFB2 denotes whether the box is normal or ‘heavy’. For normal
boxes, the lowlight color is determined by the color code stored in the register EF2. For the heavy box feature, the lowlight is de-
termined by color code stored in register EF3.
Boxes are created by a ‘pixel override’ system that overwrites character cell pixel information with either the highlight color (EF1)
or low light shadow (EF2 or EF3) of the box. Only the top pixel line of the character and the right edge of the character can be
overwritten by the pixel override system.
To form a complete box, the left hand edge of a box is created by overwriting the pixels in the right most column of the preceding
character to the one being enclosed by the box.
The bottom edge of a box is created by either
1. overwriting the pixels in the top line of the character below the character being enclosed by the box.
Or:
L
www.national.com
48
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