Thank you I did not know but with resistor he will work?
I use port D for keypad row ( rd4 to rd7 ) I does not know how to connect inputs of data with the code to find this above.
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I use for R1 1 resistor 10K and for R2 two resistor 10k in serie .
I have 3.2V in my display pin . It' ...
I try use a graphic LCD ( displaytech 64128N ( https://www.displaytech-us.com/sites/default/files/display-data-sheet/64128N%20series.pdf)) with PIC16F877A. I see this post (http://www.ccsinf ...