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Electronic Components Datasheet Search |
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LM1237 Datasheet(PDF) 17 Page - National Semiconductor (TI) |
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LM1237 Datasheet(HTML) 17 Page - National Semiconductor (TI) |
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17 / 42 page  OSD Generator Operation (Continued) ATTRIBUTE TABLES Each character has an attribute value assigned to it in the page RAM. The attribute value is 4 bits wide, making each character entry in the page RAM 12 bits wide in total. The attribute value acts as an address which points to one of 16 entries in either the two-color attribute table RAM or the four-color attribute table RAM. The attribute word in the table contains the coding information which defines which color is represented by color1 and color2 in the two color attribute table and color1, color2, color3, color4 in the four-color attribute table. Each color is defined by a 9-bit value, with 3 bits assigned to each channel of RGB. A dynamic look-up table defines each of the 16 different color combination selections or ‘palettes’. As the look-up table can be dynami- cally coded by the microcontroller over the I 2C compatible interface, each color can be assigned to any one of 2 9 (i.e. 512) choices. This allows a maximum of 64 different colors to be used within one page using the 4-color characters, with up to 4 different colors within any one character and 32 different colors using the 2-color characters, with 2 different colors within any one character. TRANSPARENT DISABLE In addition to the 9 lines of video data, a tenth data line is generated by the transparent disable bit. When this line is activated, the black color code will be translated as ‘trans- parent’ or invisible. This allows the video information from the PC system to be visible on the screen when this is present. Note that this feature is enabled on any black color in of the first 8 attribute table entries. 12 columns 18 rows COLOR 1 COLOR 2 20023421 FIGURE 14. A Two-Color Character Plane 1 + Plane 2 = Composite 20023422 FIGURE 15. A Four-Color Character www.national.com 17 |
Similar Part No. - LM1237_04 |
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Similar Description - LM1237_04 |
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