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MTV012A データシート(PDF) 5 Page - List of Unclassifed Manufacturers |
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MTV012A データシート(HTML) 5 Page - List of Unclassifed Manufacturers |
5 / 14 page MYSON TECHNOLOGY MTV012A MTV012A Revision 1.1 12/23/1998 5/14 4. H/V SYNC Processing The H/V SYNC processing block performs the functions of composite signal separation, SYNC input presence check, frequency counting, and polarity detection and control, as well as protection of VBLANK output while VSYNC speeds up to a high DDC communication clock rate. The present and frequency function block treat any pulse shorter than 1 OSC period as noise. 4.1 Composite SYNC Separate MTV012A continuously monitors the input HSYNC. If the vertical SYNC pulse can be extracted from the input, a CVpre flag is set and the user can select the extracted "CVSYNC" for the source of polarity check, frequency count and VBLANK. The CVSYNC will have a 10-16 us delay compared to the original signal. The delay depends on the OSC frequency and composite mix method. 4.2 H/V Frequency Counter MTV012A can discriminate between HSYNC/VSYNC frequency and saves the information in XFRs. The 15-bit H counter counts the time of the 64xHSYNC period, but only 11 upper bits are loaded into the HCNTH/HCNTL latch. The 11-bit output value will be (2/Hfreq) / (1/OSCfreq), updated once per VSYNC/CVSYNC period when VSYNC/CVSYNC is present, or continuously updated when VSYNC/CVSYNC is not present. The 14-bit V counter counts the time between 2 VSYNC pulses, but only 9 upper bits are loaded into the VCNTH/VCNTL latch. The 9-bit output value will be (1/Vfreq) / (512/OSCfreq), updated every VSYNC/CVSYNC period. An extra overflow bit indicates the condition of H/V counter overflow. The VFchg/HFchg interrupt is active when VCNT/HCNT value changes or overflows. Tables 4.2.1 and 4.2.2 show the HCNT/VCNT value under the 8MHz OSC operations. 4.2.1 H-Freq Table Output Value (11 bits) H-Freq(KHZ) 8MHz OSC (hex / dec) 12MHz OSC (hex / dec) 1 30 215h / 533 320h / 800 2 31.5 1FBh / 507 2F9h / 761 3 33.5 1DDh /477 2CCh / 716 4 35.5 1C2h / 450 2A4h / 676 5 36.8 1B2h / 434 28Ch / 652 6 38 1A5h / 421 277h / 631 7 40 190h / 400 258h / 600 8 48 14Dh / 333 1F4h / 500 9 50 140h / 320 1E0h / 480 10 57 118h / 280 1A5h / 421 11 60 10Ah / 266 190h / 400 12 64 0FAh / 250 177h / 375 13 100 0A0h / 160 0F0h / 240 *1. The H-Freq output (HF10 - HF0) is valid. *2. The tolerance deviation is + 1 LSB. 4.2.2 V-Freq Table Output Value (9 bits) V-Freq(Hz) 8MHz OSC (hex / dec) 12MHz OSC (hex / dec) 1 56.25 115h / 277 1A0h / 416 2 59.94 104h / 260 187h / 391 3 60 104h / 260 186h / 390 4 60.32 103h / 259 184h / 388 |
同様の部品番号 - MTV012A |
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同様の説明 - MTV012A |
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