Brian,
you can try this sequence if you need to convert a byte in the
corresponding character hexadecimal representation:

        swapf   value, W         ; Get the value nibble-swapped
        andlw   0x0f             ; Isolate the low nibble
        addlw   -0x0a            ; Check for digit value
        btfsc   STATUS, C        ; If 0-9 skip next
        addlw   0x07             ; Add offset between digits and
                                 ; letters (use 0x27 for lowercase)
        addlw   0x3a             ; Add back the value we subtracted
                                 ; for test and the offset between
                                 ; 0 and the char '0'

        (here W holds the high nibble char)

        movf    value, W         ; Get the value in W
        andlw   0x0f             ; Same as high digit
        addlw   -0x0a
        btfsc   STATUS, C
        addlw   0x07
        addlw   0x3a

        (here W holds the low nibble char)

(I am sorry if the comments are unclear but I it is a little hard for me
to explain better since English is not my native language.)

Ciao
  Marco

Thomas McGahee wrote:
>
> Brian,
> IF the original nibble is <= 9 then OR it with 30H to
> get ASCII "0" - "9" exactly as James Cameron showed you.
>
> IF the nibble has a hex value from 0AH to 0FH then
> subtract 9 and OR with 40H.
>
> For example, if the nibble
> is 0AH then subtracting 9 will give you 01H, and ORing
> with 40H will give you 41H. If you desire lower case
> instead of upper case, then OR with 60H instead.
>
> BTW, you can "subtract" 9 by adding the two's complement
> of 9, which is F7H
>
> Hope this helps.
> Fr. Tom McGahee
>
> ----------
> > From: Clewer,Brian <Brian.Clewer@TELEMATICS.COM>
> > To: PICLIST@MITVMA.MIT.EDU
> > Subject: Re: How to convert an 8 bit byte into two ASCII chars.
> > Date: Thursday, June 11, 1998 2:50 PM
> >
> > James Cameron  wrote:
> >
> > >Clewer,Brian wrote:
> > >> My problem is that I have an 8 bit byte and I need to convert it
> > >> into two printable chars to send to my PC.  E.g..  00111001 would be
> > >> 39 (in hex).  I need to send the two chars 3 and 9 to my PC.
> > >
> > >        move the byte to W
> > >        swap nibbles (swapf)
> > >        and with 0x0f
> > >        or with 0x30
> > >        send that byte
> > >
> > >        move the byte to W again
> > >        and with 0x0f
> > >        or with 0x30
> > >        send that byte
> > >
> > >Hey, I enjoyed that.  Uh oh.  ;-)
> >
> > This is ok if you use the numbers 0 to 9 but it doesn't work if you need
> > HEX values from A to F.
> >
> > Any more ideas?
> >
> > Thanks,
> > Brian.