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M35054 Scheda tecnica(PDF) 17 Page - Renesas Technology Corp |
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M35054 Scheda tecnica(HTML) 17 Page - Renesas Technology Corp |
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17 / 41 page ![]() M35054-XXXFP/M35055-XXXFP SCREEN CHARACTER and PATTERN DISPLAY CONTROLLERS MITSUBISHI MICROCOMPUTERS 16 Supplemental explanation about display control register (1) How to effect synchronous separation from composite video signals Synchronous separation is effected as follows depending on the width of L-level of the vertical synchronous period. 1. Less than 8.4 µs ······ Not to be determined to be a vertical synchronous signal. 2. Equal to or higher than 8.4 µs but less than 15.6µs ······ When two clocks continue, if take place, it is “L” period is determined to be a vertical synchronization signal. 3. Equal to or higher than 15.6 µs ······ It is “L” period is determined to be a vertical synchronous signal with no condition. The determination is made at the timing indicated by V in Fig.4 either in case 2 or in case 3. Fig. 5 The method of synchronous separation from composite video signal. 8.4 µs 15.6 µs Vertical synchronous signal Composite video signal V 8.4 µs Equalizing pulse Sequence of synchronizing pulse |
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