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DM814x NTSC

Champs

I use TV_OUT0 pin of DM8148 as the composite output.

A setup level of 7.5IRE appears in a black level when I watch NTSC signal.

Because the black level of the Japanese NTSC signal is 0IRE, I want to change it, but the way of the change is not listed even if I watch a data sheet and a reference manual.

How should I change it?

Thanks and Regards