ADC0809模数转换器

#include< reg52.h>

#define uint unsigned int

#define uchar unsigned char

uchar aa,qian,bai,shi,ge;

uint temp;

sbit clock=P2^0;

sbit start=P2^1;

sbit eoc=P2^2;

sbit oe=P2^3;

sbit ale=P2^4;

sbit adda=P2^5;

uchar code table[]={

0x3f,0x06,0x5b,0x4f,

0x66,0x6d,0x7d,0x07,

0x7f,0x6f,0x77,0x7c,

0x39,0x5e,0x79,0x71

};

//void display(uchar bai,uchar shi,uchar ge);

void delay(uint z);

void main()

{

TMOD=0x20; //设置定时器1为工作方式2

TH1=0x216; //216

TL1=0x216; //216

EA=1; //开总中断

ET1=1; //开t1中断

TR1=1;

start=0; //复位

oe=0; //输出

adda=0;

//eoc=0;

ale=0; //关闭地址选择

while(1)

{

start=0;

///delay(10);

start=1; // 复位

ale=1; // 打开地址选择

adda=0;

///delay(10);

start=0; // 开始转换

ale=0; // 关地址

//delay(1);

while(eoc==0); // 等待eoc变为1

//delay(1);

oe=1; // 打开输出

//delay(1);

//P1=0xff;

temp=P1; // 取p1到p3

oe=0; // 关输出

temp=temp*50;

temp=temp/256;

qian=temp/1000;

bai=temp%1000/100;

shi=temp%100/10;

ge=temp%10;

P3=0x00;

P0=0xfe;

P3=table[qian];

delay(50);

P3=0x00;

P0=0xfd;

P3=table[bai];

delay(50);

P3=0x00;

P0=0xfb;

P3=table[shi];

delay(50);

P3=0x00;

P0=0xf7;

P3=table[ge];

}

}

void delay(uint z)

{

uint x,y;

for(x=z;x>0;x--)

for(y=1;y>0;y--);

}

void cl() interrupt 3

{

clock=!clock;

}