May I run this code snippet past you all... for some reason, the=20
addition of WREG into ADCON0 (to select the next channel to convert) is=20
failing, but works for numbers less than 0x40:

DO_INT_ADC_3
     banksel    ADCON0           ; just in case BSR was wrong, but makes=20
no difference
     movlw    b'00001111'
     andwf    ADCON0,F,A        ; clear top nibble of ADCON0
     movlw    0x40
     addwf    ADCON0,F,A        ; set top nibble with next ADC channel=20
to convert: *** FAILS HERE!!! ***
     movlw    4
     movwf    INT_ADC_CH,A    ; set the next channel to process on=20
following call
     bsf        ADCON0,GO,A        ; start conversion
     return

It repeatably fails to add 0x40 to ADCON0, just leaving its value=20
unchanged, but works for values 0x30, 0x20 and 0x10.

It doesn't seem to be a carry or 2's compliment issue. I really can't=20
see why this doesn't work. I'll go back to bit twiddling, it works and=20
takes the same amount of code space! Just curious as to why this=20
addition breaks down at this value.

Best regards,
Matt
--=20
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