It works ok, thank you all !!

Regards,
Carlos


>> #define _ABABABAB b'01010101  ; or whatever
>>
>>       movlw  0xfc          ; bit 0,1 are low
>>
>>       btfsc  number,0      ; LSB set?
>>        movlw 0xf3          ; bit 2,3 are low
>>       btfsc  number,1      ; Bit 1 set?
>>        movlw 0xcf          ; bit 4,5 are low
>>
>>     ; write the _AB_ bit pattern
>>       andwf  var,f         ; clear the dest bits
>>       xorlw  0xff          ; complement the bit mask
>>       andlw  _ABABABAB     ; select the two desired AB's
>>       iorwf  var,f         ; write them

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