To save I/Os you could use some extra glue logic to reset the shift reg.
automaticly after n number of digits

If there's a problem with the intensity of the light you could drive it with
a higher current so that the average intensity is as if it where a DC
current gouing through it.

Stein S-J

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of P.C. Uiterlinden
> Sent: 3. mars 2001 21:24
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE]: Chip to drive a 7 seg
>
>
> Diego Sierra wrote:
> >
> > Hi!
> >
> > I want to add some 7 seg displays to a 16F84. I am thinking in
> using a 9368
> > ("hex to 7 segs decoder with latch") between the PIC and the
> displays to drive
> > them but cannot find its technical specifications. Does anyone
> have them?.
> > Is there a better (and cheap) approach?
>
> You could use shift registers (on bit per segment, serial input, parallel
> outputs). That way you can use your own "character set". It will only cost
> 2 outputs on your PIC: one for the shift clock, one for the data
> to be shifted
> into the shift register. Well maybe you'll need an extra output
> for blanking
> the displays during shifting in new data. Or use shift registers with an
> output latch, in which case you'll need the three outputs as well (the
> third one being the load pulse).
>
> Paul.
>
> > Thanks in advance,
> > Diego.
> >
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