单片机c51编程

单片机实现0-999循环显示，P1接段码选则，P2接片选（共8个七段led），
c51程序如下
#include <reg51.h>
#include <intrins.h>
int k;
static unsigned long num;
void delay();
unsigned char data dis_digit;
unsigned char code dis_code[11]={0x3f,0x06,0x5b,0x4f, // 0, 1, 2, 3
0x66,0x6d,0x7d,0x07,0x7f,0x6f, 0xff};// 4, 5, 6, 7, 8, 9, off
unsigned char data dis_buf[8];
unsigned char data value;
unsigned char data dis_index;
void main()
{ int i;
i=0;
// P1 = 0xff;
//P2 = 0xff;
TMOD = 0x01;
TH0 = 0xFC;
TL0 = 0x17;
IE = 0x82;
//num=0;
dis_digit = 0xfe;
dis_index = 0;
P2=dis_digit;
TR0 = 1;

dis_buf[0] = dis_code[(num%100000000)/10000000];
dis_buf[1] = dis_code[(num%10000000)/1000000];
dis_buf[2] = dis_code[(num%1000000)/100000];
dis_buf[3] = dis_code[(num%100000)/10000];
dis_buf[4] = dis_code[(num%10000)/1000];
dis_buf[5] = dis_code[

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