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Is 4fsc oscillation occurring?

April 26, 2017Oscillation

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10 Posted

Is 4fsc oscillation occurring?

1 Answer

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10 Posted

In the uPD6464A and uPD6465, the 4fsc or fsc signal generated by 4fsc crystal oscillation or ×4 multiplication oscillation is used for synchronization separation of the composite synchronization signal (CSYNC) (when external video signal mode is selected) or for generation of the internal video signal and internal synchronization signal (when internal video signal mode is selected). If no 4fsc oscillation is occurring, since signal separation or generation is not being performed, the characters are not displayed normally.