//代碼如下
#include <reg51.h>
#include <intrins.h>
#define uint unsigned int
#define uchar unsigned char
uchar code table[]={ //數碼管編碼 0到F
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71};
sbit dula=P2^6; //定義數碼管的段選
sbit wela=P2^7; //定義數碼管的位選
sbit adwr=P3^6;
sbit adrd=P3^7;
void delay_ms(uint); //申明延時函數；因為在主函數之前，也可以不申明
void display (uchar bai,uchar shi,uchar ge) //數碼管顯示子函數
{
P0=0x00;
dula=1;
P0=table[bai];
dula=0;
P0=0xff;
wela=1;
P0=0x7e;
wela=0;
delay_ms(5);
P0=0x00;
dula=1;
P0=table[shi];
dula=0;
P0=0xff;
wela=1;
P0=0x7d;
wela=0;
delay_ms(5);
P0=0x00;
dula=1;
P0=table[ge];
dula=0;
P0=0xff;
wela=1;
P0=0x7b;
wela=0;
delay_ms(5);
}
void delay_ms(uint cc) //延時子函數
{
uint aa,bb;
for (aa=cc;aa>0;aa--)
for (bb=110;bb>0;bb--);
}
void main() //主函數
{
uchar adval,A1,A2,A3,a;
wela=1;
P0=0x78;
wela=0;
while(1);
{
adwr=1;
_nop_();
adwr=0;
_nop_();
adwr=1;
for(a=10;a>0;a--)
{
display(A1,A2,A3);
}
P1=0xff;
adrd=1;
_nop_();
adrd=0;
_nop_();
adval=P1;
adrd=1;
A1=adval/100;
A2=adval%100/10;
A3=adval%10;
}
}
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