adc0809.c

利用单片机AT89S51与adc0809设计一个数字电压表

/************************************************
By ZhuTao
********************************************/
#include <reg51.h>
#include<absacc.h>
#include<intrins.h>
#include "numcode.h"
#define uchar unsigned char
#define uint unsigned int

#define adin XBYTE[0x7fff]


void delayus(uint us)
{
   while(us--);
}


uchar ad_action(uchar chn)
{
   uchar read_data;
   adin=chn;
   delayus(6);
   read_data=adin;
   _nop_();
   _nop_();
   return read_data;
}