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ADE3050T 数据表(PDF) 68 Page - STMicroelectronics |
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ADE3050T 数据表(HTML) 68 Page - STMicroelectronics |
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68 / 88 page  OSD Block ADE3XXX 68/88 effects. An alpha value of 255 makes the OSD opaque, while a value of 0 makes the OSD invisible, with a linear ramp of transparency between these two endpoints. Separate registers control alpha for foreground and background pixels. A fade-in/fade-out feature ramps the alpha values every six frames, starting from their current value and going up or down the sequence: 0, 16, 32, 64, 128, 192, 224, 240, 255. Row 15 also contains definitions for the four display windows. These windows define regions on the screen to which borders and shadows can be applied. (They are not analogous to windows in a GUI display, in that they do not represent four independent data displays. There is only one character map. The windows essentially define an area around which a border can be drawn or to which attributes can be assigned.) Windows also determine which of the two color tables will be used for the characters inside. Windows have a fixed precedence: window 0 has the highest precedence and window 3 the lowest. When windows overlap, the precedence determines which borders will be displayed and which color tables will be used in the overlapping area. Monochrome and color fonts are affected differently by attribute bytes. Monochrome characters are affected by shadows and borders, and have their color specified by the foreground/background attributes. Color characters interpret the attribute byte differently than monochrome characters, using it to define blinking and 90-degree rotations rather than blinking, foreground color, and background color. Color Tables There are two color tables, each containing sixteen entries by three bytes each, giving a 24-bit RGB value for each entry. Entry 0 is used for the shadow color for monochrome characters and borders. Color-table selection is made on a window-by-window basis. When writing the color table, the “row” value in the first header byte is interpreted as the color table index, while the “column” value in the second header byte encoded to select the color table (0 or 1) Figure 9: Character Attribute Map Character Attributes 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 wa wa ga ga wa wa = window attributes ga = global attributes |
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