51單片機驅動 adc0804模數轉換 ，下面是電路圖
#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口定義
sbit wr=P3^5;
sbit cs=P3^7;
read_adc0804()//控制并讀取adc0804轉換好的數據
{
uchar a; //寫入控制命令，啟動轉換
cs=1;
wr=1;
cs=0;
wr=0;
_nop_();
wr=1;
P1=0xff; //讀取已轉換好的數據
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，和個位
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]);
}
}