51单片机驱动 adc0804模数转换 ，下面是电路图

#include<reg51.h>

#include "lcd.h"

#include<intrins.h>

#define uint unsigned int

#define uchar unsigned char

uchar lcd[]="0123456789";

sbit rd=P3^6; //IO口定义

sbit wr=P3^5;

sbit cs=P3^7;

read_adc0804()//控制并读取adc0804转换好的数据

{

uchar a; //写入控制命令，启动转换

cs=1;

wr=1;

cs=0;

wr=0;

_nop_();

wr=1;

P1=0xff; //读取已转换好的数据

rd=1;

rd=0;

_nop_();

a=P1;

rd=1;

cs=1;

return a;

}

void main()

{

uchar a,A1,A2,A3;

lcd_init();

while(1)

{

a=read_adc0804();

A1=a/100; //分出百，十，和个位

A2=a%100/10;

A3=a%10;

lcd_busy();

lcd_xy(3,0);

lcd_write_dat(lcd[A1]);

lcd_busy();

lcd_xy(4,0);

lcd_write_dat(lcd[A2]);

lcd_busy();

lcd_xy(5,0);

lcd_write_dat(lcd[A3]);

}

}