em moi lam wen voi con 18F nen ko biet ro lam, em lay chuong trinh "led 8x32 dung 16f877a" chay mo phong ok tren dien dan sua code lai cho con 18f4550. Nhung ko hieu sao no ko chay mo phong dc.
Mong cac anh giup do.
link:
http://www.mediafire.com/?9cg44voazmvwzdv