ADC interfaced with P89V51RD2 Microcontroller.

#include
#include
#define ch1 0xE8;
#define ch2 0xE9;
#define ch3 0xEA;
#define ch4 0xEB;
#define ch5 0xEC;
#define ch6 0xED;
#define ch7 0xEE;
#define ch8 0xEF;

xdata volatile unsigned char CONTROL _at_ 0xFC00;

sbit b=P3^2;

void Send(unsigned char x)
{
SBUF=x;
while(!TI);
TI=0;
}


void Send_String(char* string, unsigned char no_of_bytes)
{

int i, stringlength = no_of_bytes;

for(i=1; i<=stringlength; i++)
{
Send(*string++);
}

}
void hex2ascii(unsigned char i)
{

unsigned char tmp;
unsigned char ASCII[2];

tmp = i>>4;

if(tmp <= 0x09)
ASCII[0] = tmp+0x30;

else
{
ASCII[0] = tmp-0x9;
ASCII[0] += 0x40;
}

tmp = (i & 0x0f);

if(tmp <= 0x09)
ASCII[1] = tmp+0x30;

else
{
ASCII[1] = tmp-0x9;
ASCII[1] += 0x40;
}

Send_String(ASCII,2);
}


unsigned char Read_ADC(unsigned char x)
{
b=1;
if(x=='1')
{
CONTROL=ch1;
while(!b);
return CONTROL;

}
if(x=='2')
{
CONTROL=ch2;
while(!b);
b = 0;
return CONTROL;
}
if(x=='3')
{
CONTROL=ch3;
while(!b);
return CONTROL;
}
if(x=='4')
{
CONTROL=ch4;
while(!b);
return CONTROL;
}
if(x=='5')
{
CONTROL=ch5;
while(!b);
return CONTROL;
}
if(x=='6')
{
CONTROL=ch6;
while(!b);
return CONTROL;
}
if(x=='7')
{
CONTROL=ch7;
while(!b);
return CONTROL;
}
if(x=='8')
{
CONTROL=ch8;
while(!b);
return CONTROL;
}
}

void delay(void)
{
unsigned int k;
for (k=0;k<0xfffe;k++)
{
_nop_();_nop_();_nop_();_nop_();_nop_();
_nop_();_nop_();_nop_();_nop_();_nop_();
_nop_();_nop_();_nop_();_nop_();_nop_();
}
}

void main(void)
{
SCON = 0x50;
TMOD = 0x21;
TH1 = 0xfd;
TL1 = 0xfd;
TCON = 0x45;
TR1=1;

while(1)
{

hex2ascii(Read_ADC('1'));

delay();
}
}