# include reg51h sbit cs =p1^3; sbit wr =p1^2; sbit rd =P1^1; int seg =0xc00xf90xa40xb00x990x920x820xf80x800x90; unsigned char dat ; void adc0804; void display ; void delay int i while i --; void m

void display (){ unsigned int vol ; vol = (dat *500.0/255)+0.5; //四舍五入 p2=0xfb; P0= seg [ vol /100]&0x7f; delay (200); p2=0xfd; P0= seg [ vol %100/10]; delay (200); P2=0xfe; P0= seg [ vol %10]; delay (200); P2=0xff; P0= 0xc1; //显示U delay (200); }