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sbit INT = P3^3;
sbit RW = P3^2; //edge L->H (canh len) cho phep analog signal vao ADC _bat dau chuyen doi//allow analog input
sbit READ = P3^1;//doc data tu ADC0804 edge H->L (tac dong canh xuong)// read data convertion
sbit CS = P3^0;//chipselect