Originally posted by Dwayne
Hello Desterline,

Long time no hear...Great to see you again.
I've been around, just not actively posting. Time's been in short supply the last few months.


D>>I'd be interested to hear about anyone else's experiences using timer1 near it's maximum speed.

Unless there's a better option I'm overlooking?<<


Just for kicks, In Ham radio, we combine two frequencies, and get different results. the results we use to amplify and receive our original signal.

Could you inject a frequency into your 50 MHZ signal so that the result can be used by your PIC? Maybe a 49MHZ and use the 1 MHZ difference for the chip to capitalize on?

Dwayne
Hmmm... Interesting possibility, but I don't think it'll work in this case. I'm actualy trying to time something very precisely. Basicly a super stopwatch. (10s of nanoseconds accuracy over ~5 minute period).

I don't realy see how to maintain the precision without actualy counting the higher frequency.

With such resolution and range it works out to about 40 bits of counter. I was hoping to keep the chip count low by doing the slower count on the pic. Right now it looks like one external four bit counter, 16 bits of timer 1 and a software counter beyond that.

50MHz /16 drops it to just over 3 MHz, but another part of the project needs one D-flipflop, I was thinking about spliting one off the counter to keep chip count low. The the pic would have to count ~6.25MHz. Doable, asuming I read the datasheet correctly :-)

But I'm open to better ideas...
-Denny