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M35061 数据表(PDF) 30 Page - Renesas Technology Corp |
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M35061 数据表(HTML) 30 Page - Renesas Technology Corp |
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30 / 40 page ![]() 29 SCREEN CHARACTER and PATTERN DISPLAY CONTROLLERS M35061-XXXSP/FP MITSUBISHI MICROCOMPUTERS 10. Notes on fsc signal input (1) This IC amplifies the subcarrier frequency (fsc) signal (NTSC sys- tem: 3.580 MHz, PAL system: 4.434 MHz, M-PAL system: 3.576 MHz) input to the OSCIN pin and generates the composite video signal internally. The amplified fsc signal can be destabilized in the following cases. (a) When the fsc signal is outside of recommended operating conditions (b) When the waveform of the fsc signal is distorted (c) When DC level in the fsc waveform fluctuates When the amplified signal is unstable, the composite video signal generated inside the IC is also unstable in terms of synchroniza- tion with the subcarrier and phase. Consequently, this results in color flicker and lost synchroniza- tion when the composite video signal is generated. Make note of the fact that this may prevent a stable blue background from be- ing formed. (2) When switching to internal synchronization from external syn- chronization (fsc signal is OFF), start fsc signal input 20 m sec or more before the internal oscillator circuit stabilizes. |
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