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LP8556: to write EPROM register

Guru 29690 points
Part Number: LP8556

Hi Team,

I believe EPROM registers (98h, 9Eh, A0h-AFh) can be written only when backlight is disabled.
Is my understanding correct?

If the answer is yes, should I set both BL_CTL(01h, bit 0)=0 and BL_ON(A2h, bit 3)=0 before writing EPROM registers?

Best Regards,
Yaita / Japan disty