STC12C5410AD AD conversion sample program

#include"STC12C5410AD.h" 
#define uchar unsigned char 
unsigned char aa,bb; 
void delay(uchar dd) 
{ 
int x,y; 
for(x=dd;x>0;x--) 
for(y=100;y>0;y--); 
} 
unsigned char Read_ADC(unsigned char adcvcc) 
{ 
//Set P1.0--P1.1 to the mode suitable for AD conversion 
ADC_CONTR = ADC_CONTR|0x80; //1000,0000 turn on the A/D conversion power 
delay(20); //20ms 
ADC_CONTR = ADC_CONTR&0xE0; //1110,0000 clear ADC_FLAG, ADC_START bit and the lower 3 bits 
ADC_CONTR = ADC_CONTR&0xf8|adcvcc; //Set the current channel number 
delay(10); //Delay to make the input voltage stableADC_DATA 
= 0; //Clear A/D conversion result registerADC_CONTR 
= ADC_CONTR|0x08; //0000, 1000ADCS = 1, start conversiondo 
{ ; } while((ADC_CONTR & 0x10)==0); //0001, 0000 wait for A/D conversion to 
endADC_CONTR = ADC_CONTR&0xE7; //1110, 0111 clear ADC_FLAG and ADC_START bits, stop A/D conversionreturn 
ADC_DATA; 
} 
void main() 
{ 
//Add the ADC port setting, such as) 1.0, if P1.1 is set as ADC port: 
    P1M0 = 0x03; //0000, 0011 is used for A/D conversion P1.x port, set to open drain 
firstP1M1 = 0xC3; //0000, 0011P1.0--P1.1 is set to open drain first. Disconnect the internal pull-up resistor 
bb=0x01; 
while(1) 
{ 
  aa=Read_ADC(1); //The first A/D conversion; if you want to change to another path, just change the input channel. 
  P3=aa; //This is to display the A/D data on the LED of P3 port. 
} 
}