//AD  TLC0831
#include <reg52.h>
#include <stdio.h>
#include <absacc.h>
#define uchar unsigned char
#define uint unsigned int

sbit adcdo=P1^3;
sbit adccs=P1^4;
sbit adcclk=P1^5;

void delay1(uchar x);
uchar readadc(void);
void adcck(void);

void delay1(uchar x) { 
   uchar i; 
   for(i=0;i<x;i++); 
}

void adcck(void) {  
   adcclk=1; delay1(2); 
   adcclk=0; delay1(2); 
}

uchar readadc(void)
{  uchar i;
   adccs=0; adcck(); ch=0;
   for (;adcdo==1;) adcck();
   for (i=0; i<8; i++) { adcck(); ch=(ch<<1)|adcdo; }
   adccs=1;
   return(ch);
}