And you can look at this to :
[i:00373802ef]6.6 FUNCTION SET INSTRUCTION (in datasheet)[/i:00373802ef]
you can set [url=http://avrhelp.mcselec.com/index.html?lcdcontrast.htm]contrast[/url] via cmd lcdcontrast [0-3] contrast 25-50-75-100%
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