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!