low battery detection

i want to use pic16f628 in my ups project for low battery detection.i wanna use its internal comparator in ccs.please give me examples in ccs compiler or any tutorials for this.
thanx n advance

Hi,

Do you want to know the battery voltage or do you want to know
when the battery is low,because I have the code for if you
want to know the battery voltage.
I am using a LCD.

here is the code (in pic C).

// To read analog i/p and writes battery voltage to LCD when "reset" (inputB7) is pressed
// force ADC to 8-bit in wizard ************************* NB ! ! *******
set_adc_channel(0);
delay_ms(40);
value = read_adc();
delay_ms(20);
dec();
a1 = hund;
b = tens;
c = ones;
ASCII();
ana1 = a1;
ana2 = b;
ana3 = c;
LCD_FunctionMode();
LCD_Write_4_Bit(clear_lcd);
LCD_Write_4_Bit(0xd4); // Goto line 4 positoin 1
LCD_DataMode();
LCD_Write_4_Bit('B');
LCD_Write_4_Bit('a');
LCD_Write_4_Bit('t');
LCD_Write_4_Bit('t');
LCD_Write_4_Bit('.');
LCD_Write_4_Bit('V');
// LCD_Write_4_Bit('o');
// LCD_Write_4_Bit('l');
// LCD_Write_4_Bit('t');
LCD_Write_4_Bit('=');
// LCD_Write_4_Bit(' ');
LCD_FunctionMode();
LCD_Write_4_Bit(0xdc); // Goto line 4 positoin 7
LCD_DataMode();
LCD_Write_4_Bit(ana1);
LCD_Write_4_Bit(ana2);
LCD_Write_4_Bit(',');
LCD_Write_4_Bit(ana3);