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Is the composite synchronization signal (CSYNC) being input?

April 26, 2017Composite csync input signal synchronization

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Is the composite synchronization signal (CSYNC) being input?

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In external video signal mode, the uPD6464A/uPD6465 timing generator resets the horizontal control section, vertical control section, and output controller by using the horizontal synchronization signal (Hsync) and vertical synchronization signal (Vsync) obtained by synchronization separation of the composite synchronization signal (CSYNC). It also generates reference signals for counting. If no composite synchronization signal (CSYNC) is being input, since the timing generator is not generating these reference signals, the characters are not displayed normally. In internal video signal mode, since Hsync and Vsync are automatically generated within the device, the characters are displayed even if no composite synchronization signal (CSYNC) is being input.