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On most of the schematics it is RS (Register select) but I can't figure out what D/I (pin 4) mean, I haven't found anything about that. What could it mean ? The datasheet indicate it's the register select pin, but I'm interested in the D/I meaning

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"Data/Instruction". It does the same thing as Register Select but is more explicit about it.

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  • \$\begingroup\$ I just had a flash at the same moment your answer showed up ! Thanks ! \$\endgroup\$ – GmodCake Sep 2 '16 at 23:10

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