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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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MCD212 데이터시트(PDF) 63 Page - Motorola, Inc |
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MCD212 데이터시트(HTML) 63 Page - Motorola, Inc |
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63 / 87 page  MCD212 8–4 MOTOROLA Mixing is applied to image planes A and B. They are weighted and added (see Figure 8–6). The weighting and adding is done preserving the black level (level 16): AB = lim[ (A ) 16) * WEIGHT_A/64 + (B) 16) * WEIGHT_B/64 + 16 ] When the result exceeds level 255, the result is fixed at 255. When the result is less than level 0, the result is fixed at 0. Planes A and B are made transparent for overlay by making them black. + PLANE A BLACK (16) MUX A X BL_A WEIGHT_A (0 …63) PLANE B BLACK (16) BL_B MUX X B MUX MUX DAC CUR CURSOR BACKDROP WEIGHT_B (0 …63) AB (0 …255) VDSC VSD VSA BD EXTERNAL VIDEO ANALOG SWITCH Figure 8–6. Overlay and Mixing — One Color Component Weight factors are programmed via the weight registers. The weight factors can be dynamically changed by the region control registers at the position they indicate. Backdrop and cursor can be overlaid on the combined planes A and B. During horizontal and vertical blanking of the video a constant level is set on each component. For 50 Hz display this level is 16 and for 60 Hz display 0. |
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