Hi,

why do not use an MT8870 DTMF decoder IC? It interfaces to the PIC with
4+1 lines. It is superior and cheap.

Here is my $0.02

Imre


On Wed, 14 Jul 1999, Harry Febianto wrote:

> Hi,
>
> I have a final project for my college. I plan to detect dtmf signal from
>
> telephone to be decoded. I use PIC 16F84. And I have some
> possibilities/theorys. Using interrupt and counter together or counter
> only
> or ADC 1bit (or 8 bit ADC).
>
> I think I need some literatures, and many thanks if you can give me some
>
> references that I can download. Which one is better for above theorys ?
> Or
> do you have any advise or some example program ?
>
> Thank you very much for your help.
>
>
> Best Regards,
>
> Harry Febianto
>
>