How about just using a second PIC (F84 etc to drive the LED's)?
The main (existing) PIC needs to only have 2 o/p lines to control
this.  With a serial-like protocol, I'm thinking that it could be done
with only 1 o/p line from the main PIC.  The second PIC would
handle sequencing of the LED's etc.

Cheers,
-Neil.


----- Original Message -----
From: "Alan B. Pearce" <A.B.Pearce@RL.AC.UK>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Thursday, March 07, 2002 10:05 AM
Subject: Re: [EE]: Shift+latch+driver


> >A good solution seems to be the use of a shift register
> >(serial-in/parallel-out), a latch and a driver for the 7 segments
display.
> I
> >cannot found all of that in just one chip. Could any of you give me a
> hint?, or
> >point me to a schema?
>
> Check out 74HC573/574 shift register/latch chips. You may still need an
> external driver.
>
> Others on the list may be more familiar with ones that do not need an
> external driver.
>
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