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#include<reg51.h>
#include<intrins.h>
#define uchar unsigned char
#define uint unsigned int
sbit ST=P2^0; //啟動轉(zhuǎn)換位
sbit OE=P2^2; //輸出允許位
sbit ALE=P2^3; //地址允許鎖存位
sbit EOC=P2^1; //轉(zhuǎn)換結(jié)束位
sbit CLK=P2^4; //時鐘
long int datas,bai,shi,ge;
uchar duan;
uchar code num[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f}; //不帶點(diǎn)的數(shù)字
uchar code num_dot[]={0xbf,0x86,0xdb,0xcf,0xe6,0xed}; //帶點(diǎn)的數(shù)字
uchar code wei[]={0x0d,0x0b,0x07}; //位碼
void delay(uint z)
{
uchar i;
while(z--)
for(i=0;i<120;i++);
}
void display()
{
uchar i=0;
bai=(datas*500/255)/100; //百位的計算
shi=(datas*500/255)/10 % 10; //十位的計算
ge=(datas*500/255) % 10; //個位的計算
for(i=0;i<3;i++)
{
P3=wei[i];
if(i==0){duan=num_dot[bai];}
else if
(i==1){duan=num[shi];}
else if
(i==2){duan=num[ge];}
P0=duan;
delay(2);
}
}
void main()
{
TMOD=0x02; //定義T0,工作方式2
TH0=0x216; //TH0初值
TL0=0x216; //TH1初值
EA=1; //打開總中斷
ET0=1; //打開TO中斷允許位
TR0=1; //打開T0
while(1)
{
ST=OE=0; //將START和EO先置0
ALE=1; //將ALE和ST置1拉高電平
ST=1;
ALE=0; //將ALE和START置0開始數(shù)據(jù)變換
ST=0;
while(!EOC); //等待EOC，ECO為1表示轉(zhuǎn)換完成
OE=1; //打開OE，讀取數(shù)據(jù)
datas=P1; //將數(shù)據(jù)保存在datas
display();
}
}
void inter_1() interrupt 1
{
CLK=~CLK;
}

復(fù)制代碼