[SOLVED] LPC2138 ADC0.0 Simulation Problem in Proteus??

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/*****************ADC Functions***************/
void ADC0_Init(void)
{
    /*************Initialize ADC AD0.0*************/
    AD0CR = 1<<21;                              //A/D is Operational
    AD0CR = 0<<21;                              //A/D is in Power Down Mode
    PCONP = (PCONP &0x001817BE) | (1UL<<12);
    PINSEL0 = 0x00;
    PINSEL1 = 0x00400000;                   //P0.27 is Configured as Analog to Digital Converter Pin AD0.0
    
    AD0CR = 0x00200401;                     //CLKDIV=4,Channel-0.0 Selected,A/D is Operational
    /*
    A/D Clock = PCLK /(CLKDIV+1);
    */
    /**********************************************/
}
 
unsigned int ADC0_Read(void)
{
    unsigned long adc_data;
    
    AD0CR |= 1UL<<24;                           //Start Conversion
    do
    {
        adc_data = AD0GDR;
    }while(!(adc_data & 0x80000000));
    //Wait untill the DONE bits Sets
    AD0CR &= ~0x01000000;                   //Stops the A/D Conversion   
    
    adc_data = adc_data >> 6;
    adc_data = adc_data & 0x3FF;    //Clearing all other Bits
 
return (adc_data);
}
 
 
/*********************************************/
unsigned long adc_data;
 
int main()
{
    unsigned char msg[] = "EMBEDDED LAB";
    unsigned char adc_example[] = "ADC EXAMPLE";
    unsigned char data_received[] = "ADC VALUE:";
 
    
    Lcd_Init();
    UART0_Init();
    Delay_ms(10);
    
    UART0_Write_Text(msg);
    UART0_Write(10);
    UART0_Write(13);
    Lcd_Write_Text(msg);
    Lcd_Cmd(SECOND_ROW);
    Lcd_Write_Text(adc_example);
    UART0_Write_Text(adc_example);
    UART0_Write(10);
    UART0_Write(13);
    
    Delay_ms(1000);
    Lcd_Cmd(LCD_CLEAR);
    Lcd_Write_Text(data_received);
    Lcd_Cmd(SECOND_ROW);
    
    ADC0_Init();
    while(1)
    {
        adc_data = ADC0_Read();
        adc_data = adc_data*3300;
        adc_data = adc_data/1023;           //Value of Voltage in Milli Volts
        Display_Number_Lcd(2,1,4,adc_data);
        Lcd_Write('m');
        Lcd_Write('V');
        Delay_ms(10);
    }   
}