10bit ADC = 65536 ????

[erpalma]

I've set up a little program to try out adcin on 16f873A:

DEFINE LCD_DREG PORTB     ' LCD data port 
DEFINE LCD_DBIT 4         ' LCD data starting bit 0 or 4 
DEFINE LCD_RSREG PORTB    ' LCD register select port 
DEFINE LCD_RSBIT 0        ' LCD register select bit 
DEFINE LCD_EREG PORTB     ' LCD enable port 
DEFINE LCD_EBIT 2         ' LCD enable bit 
DEFINE LCD_BITS 4         ' LCD bus size 4 or 8 
DEFINE LCD_LINES 4        ' Number lines on LCD 
DEFINE LCD_COMMANDUS 2000 ' Command delay time in us 
DEFINE LCD_DATAUS 50      ' Data delay time in us

DEFINE ADC_BITS 10 
DEFINE ADC_CLOCK 3 
DEFINE ADC_SAMPLEUS 50 

input PORTA.0
ADCON1 = ADCON1= %10001111

DEFINE OSC 12

Acquisition     var word
Clr             CON 1
Comm            Con $FE


Main:
    ADCIN 0, Acquisition
    lcdout comm, clr, dec acquisition
    PAUSE 100
goto Main

Why it gives me a range of values from 0 to 65535 (5V)?? Shouldn't be 1024?

PS. Setting 8bit gives me 256 values as it should be.

[mister_e]

?????

ADCON1 = ADCON1= %10001111

i think you just trick the compiler with this one, try

ADCON1 = %10001111

[mister_e]

and... mmm if you're using the internal Vref, you must use

ADCON1=%10001110

[erpalma]

and... mmm if you're using the internal Vref, you must use

ADCON1=%10001110

Really stupid error!

Thanks!