How about the 12c671?  same 8 pin form factor, but has interrupts.  Think of
it as a small 16c71, with way more RAM (128 bytes).  Downside - costa about
double the '508.

dwayne


>What I am doing is using the INT interrupt on a 16F84 to
>capture my period, using a 1us resolution.  I do this by counting

snip

>My problem is that I need to use the 12C508 or something of that
>form factor.  Without the benefit of interrupts, I can't depend
>on the background processing of the edge detection and the timing.


Dwayne Reid   <dwayner@planet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
(780) 489-3199 voice          (780) 487-6397 fax

Celebrating 15 years of Engineering Innovation (1984 - 1999)

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Do NOT send unsolicited commercial email to this email address.
My posting messages to Usenet neither grants consent to receive
unsolicited commercial email nor is intended to solicit commercial
email.