em dang lam do an khoa so thong qua ban phim 4x4 hien thi len lcd 16x2 thong qua con Pic16f877a,em tim hieu thi ve duoc so do nguyen ly,nhung con code thi khi khai bao torng ccs no bao sai loi o phan khai bao lcd_4bit,nho may a coi giup em voi,em sap nop do an roi:(
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