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ST72734 数据表(PDF) 60 Page - STMicroelectronics |
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ST72734 数据表(HTML) 60 Page - STMicroelectronics |
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60 / 144 page ![]() ST72774/ST727754/ST72734 60/144 Figure 41. Moire Output (instead of Clamping Output) 4.4.5.1 Blanking output signal The Video Blanking function uses VSYNCO, HFBACK, VFBACK as input signals and BLANKOUT output as Video Blanking Output. This output pin is a 5V open-drain output and can be AND-wired with any external video blanking signal. Note: HFBACK, VFBACK, VSYNCO signals must have positive polarity. To use the video blanking signal: – Program the polarity: BLKINV bit in POLR register – Enable the BLANKOUT output: BLKEN bit in ENR register Figure 42. Video Blanking Stage Simplified Schematic HFBACK Moire VFBACK BLANKOUT BLKEN HFBACK VFBACK VSYNCO To Edge detector (LATR) R S To Edge detector (LATR) BLKINV |
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