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M37271MF-252SP 数据表(PDF) 32 Page - Mitsubishi Electric Semiconductor |
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M37271MF-252SP 数据表(HTML) 32 Page - Mitsubishi Electric Semiconductor |
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32 / 97 page  MITSUBISHI MICROCOMPUTERS M37271MF-XXXSP M37271EF-XXXSP, M37271EFSP SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER 32 (4) Timing Signal Generating Circuit This circuit generates a reference clock which is 832 times as large as the horizontal synchronizing signal frequency. It also generates various timing signals on the basis of the reference clock, horizontal synchronizing signal and vertical synchronizing signal. The circuit operates by setting bit 0 of data slicer control register 2 (address 00EB16) to “1.” The reference clock can be used as a display clock for OSD function in addition to the data slicer. The HSYNC signal can be used as a count source instead of the composite sync signal. However, when the HSYNC signal is selected, the data slicer cannot be used. A count source of the reference clock can be selected by bit 1 of data slicer control register 2 (address 00EB16). Fig. 26. Determination of V-pulse waveform Composite sync signal AB 0 1 1 V-pulse (“L” pulse width is long, “H” pulse width is short) Bit 5 of DSC2 |
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