20x4 LCD is extended version of 16x2 LCD the only difference is their size & capacity to display
16x2 is 16 character x 2 lines &
20x4 is 16 character x 4 lines
Their interfacing is same. Please refer the bottom memory diagram for 20x4 in the slide which is same for 16x2
16x2 is 16 character x 2 lines &
20x4 is 16 character x 4 lines
Their interfacing is same. Please refer the bottom memory diagram for 20x4 in the slide which is same for 16x2
Please find controller specific details & compiler details on that specific page.
You can download code from here
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