12 bit or higher ADC on a PIC that works with PBP?

[Bruce]

As far as I can tell the 16F882 is 10-bit. I wouldn't think the 882 had 12-bit when the rest
of the same family like 883, 884, 886 and 887 were all 10-bit.

I've used the 18F2553 and 18F2523 12-bit A/D. Here's a short code example;

'CONFIG settings in 18F2553.INC
'CONFIG PLLDIV=5,CPUDIV=OSC1_PLL2,USBDIV=2,FOSC=HS,FCMEN=OFF,IESO=OFF
'CONFIG VREGEN=OFF,CCP2MX=ON,WDT=OFF,WDTPS=32768,PBADEN=OFF,PWRT=OFF,MCLRE=OFF
'CONFIG LPT1OSC=OFF,BOR=ON,BORV=2,STVREN=ON,LVP=OFF,XINST=OFF,DEBUG=OFF,WRTB=ON
    
    DEFINE OSC 20
    DEFINE DEBUG_REG PORTC
    DEFINE DEBUG_BIT 6    ' Hardware USART TX pin
    DEFINE DEBUG_BAUD 9600
    DEFINE DEBUG_MODE 0   ' Non-inverted mode through MAX233
    
    ADResult VAR WORD
    
    Q CON 3126         ' (5/4095)*256=0.312576313. rounded up to 3126
    
    ADCON0 = %00000001 ' A/D module enabled, channel 0
    ADCON1 = %00001110 ' Vref = Vdd & Vss, AN0 = analog
    ADCON2 = %10101011 ' Right justified, 12 Tad, Frc clock
    INTCON = %01000000 ' Global ints disabled, enable peripheral interrupts
    PIE1.6=1           ' A/D interrupt enabled (for wake from sleep)
    
    ' Note we don't use an interrupt routine since the A/D complete
    ' interrupt is only waking the PIC from sleep.
    
Main:
    ADCON0.1=1           ' Start the A/D conversion
    @ SLEEP              ' Sleep until A/D conversion finished
    WHILE ADCON0.1       ' A/D complete?
    WEND                 ' 
    PIR1.6=0             ' Clear A/D int flag
    
    ASM
     MOVFF ADRESL,_ADResult   ; get low byte
     MOVFF ADRESH,_ADResult+1 ; get high byte
    ENDASM
    
    DEBUG "Raw A/D val = ",DEC ADResult,13,10
    ADResult = ADResult */ Q
    DEBUG "ADResult */ ",DEC Q," = ",DEC ADRESULT,13,10
    DEBUG "ADResult = ",DEC ADResult DIG 4,".",DEC ADResult DIG 3,_
    DEC ADResult DIG 2,DEC ADResult DIG 1,"V",13,10
    PAUSE 2000
    GOTO Main
    
    END

[Charles Linquis]

I have used the new 18F8723 with 12 bit A/D.

To get the the full resolution, you have to use DEFINE

"DEFINE ADC_BITS 10"

Because PBP only "knows about" 8 and 10 bit converters.
If the DEFINE is missing or not interpreted properly in the
compiler, it will default to 8 bits.

If you use the line above at the top of your program,
and have a 12-bit converter in your chip, the result will
indeed have a full 12 bits of resolution.