In case of 2x16 LCD we have 8 data bus lines.. .If I want to interface that LCD with 4 data lines only.. Which data lines I have to choose what about remaining pins either left free or grounding...
I think I see part of the problem. I went looking around the web and it is hard to find decent sites for data sheets. If you had given a manufacturer and part number, sometimes their site will have PDF data sheets and app notes.
If your display is controlled by a 44780 controller, you can indeed use 4-bit mode to load 8-bit characters, using two write cycles for each character. The data goes on the high 8 bits (D4-D7) and D0-D3 can be left unconnected. Lots of other details can be found at:
That's not my blog. It's not clear just whose blog it is, but it is definitely well done.
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