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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LM2467 датащи(PDF) 17 Page - National Semiconductor (TI) |
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LM2467 датащи(HTML) 17 Page - National Semiconductor (TI) |
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17 / 43 page  Programmable Horizontal Blank The leading edge position of the internal horizontal blank can be programmed with respect to the horizontal flyback zero crossing leading edge in steps of 4 OSD pixels up to a maximum of 16 steps as shown below in Figure 12. This start position of the horizontal blanking pulse is only pro- grammable to occur before the horizontal flyback zero cross- ing edge, and cannot be programmed in the opposite direc- tion. The trailing edge of the horizontal blanking pulse is independent of the programmable leading edge, and its relativity to the Horizontal flyback trailing edge remains un- changed. To use this feature, Horizontal Blanking (0x843A[0] which is enabled by default) and Programmable Horizontal Blanking (0x843A[2]) must be enabled. The number of steps is programmed with the bits in 0x843A[6:3]. When this fea- ture is disabled, please refer to the H-Blank Time Delay - On specification (+ Zero Crossing of I HFB to 50% of output blanking end) listed under the System Interface Signal Char- acteristic section. 20075752 FIGURE 12. Programmable Internal H. Blank www.national.com 17 |
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