Dear Michael,
        I have gotten that far (and learnt a lot in the process). I have two hurdles at the moment.
1:      Converting a 32 bit number (or at least 24 bit) to ascii to send to an lcd display
2:      Because I'm using effectivly a 16 bit counter to count the pulses at the input, this gives me at the most a 5 digit resolution. The frequency meter from weeder
technologies uses the same principle but achieves a 7 digit resolution. Any ideas how?

Thanks for your time and help
Regards
Stuart O'Reilly
10/4/01 7:28:02 PM, lu01ts@gmx.net wrote:

>Hello Stuart,
>
>I hope I got the question right and will try to answer it.
>
>        _R_
>  f ---|___|------ RA4
>               |
>               |-- RA3
>
>The frequency is connected to RA4 using a resistor.
>The 'trick' is to connect another port-pin directly to the RA4 input (e.g. RA3).
>Setting RA4 to input (as required for the counting-part) and setting
>RA3 to input during the gate is open (the time the counter should
>count) will make everthing work as 'normal'. But now here's the trick.
>Making RA3 an output will stop the counter from working. Now you're
>able to read out the 8-bit register for TMR0. After that you can clock
>RA3 (and with that the prescaler register which you can't read
>directly) until TMR0 increments by 1. Counting the clocks it takes to
>increment the TMR0 gives you (indirectly) the number that was in the
>prescaler register.
>
>I hope this will help you. If there are any further questions don't
>hestitate to write.
>
>Greets,
>       Michael
>
>SOR> Dear All,
>SOR>     I'm trying to build a 50 meg frequency meter as per the application note AN592 from microchip. I'm using a mixture of PBP and assembly. The application says to
use the TMR0 and prescaller
>SOR> which will give you a count of 16 bits (5 decimal digits). I have also looked at the code for the frequency meter developed by weeder technology (this is displayed
on www.piclist.com), and
>SOR> although it appears to use the same theory of operation it does actually produce a seven digit display. Can anyone explain how it produces a seven digit display?
I've tried reading the asm code
>SOR> but slowly got lost. Also any comments etc regarding this project would be appreciated.
>SOR> Regards
>SOR> Stuart O'Reilly
>
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>
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