Hi,
I use daisy-chained 74164's, each for very digit. I need only 2 wire for
one display. The Pic Basic Pro does it fine with SHIFTOUT command, but it
is easy to write it in assembly, too. I think for your three groups you
can connect all the DATA lines, only the CLOCK lines should be separate.
If you want nice result, you should turn the display OFF whilst updating
their content. And don't forget the correct CLEAR circuit.

I hope it helps you.

Imre


On Fri, 17 Jul 1998, Ali Haydar GOKTOGAN wrote:

> Hi,
>
> In a PIC based project I need to drive 3 groups of 8 digits 7+1
> segment (including decimal point) LED displays.
>
> Any suggession will be appreciated..
>
> Thanks...
>
>