#include <reg51.h>
sbit du = P2^6;
sbit we = P2^7;
void delay (unsigned z)
{
unsigned int x,y;
for (x=z;x>0;x--)
for(y=120;y>0;y--);}
void main ()
{
du = 1;
P0 = 0x06;
du = 0;
delay (1000);
we = 1;
P0 = 0xef;
we =0;
}
为什么只有一个数码管亮????