This is just a 'bouncing switch' test.  The oscillations from the VCO will
be just like a (slow) switch closure as far as the PIC pin is concerned.
Look up 'de-bouncing a switch in software' on almost any PIC site and adjust
the pause for your desired oscillation end point.

Bye.

        -----Original Message-----
        From:   Andy Farrar [SMTP:andrew.farrar@PORT.AC.UK]
        Sent:   Wednesday, 25 August 1999 3:29
        To:     PICLIST@MITVMA.MIT.EDU
        Subject:        monitoring no change on line

        Hello,
        I have a requirement (actually a friend has) whereby output pin on
        pic triggers a VCO, starts off at high frequency and eventually
slows
        down to DC settling on '0' or '1', is there an efficient way to
        monitor this pin, preferably with software or could be hardware if
        not too elaborate to say when it has settled '0' or '1', ie is no
        longer clocking; once this happens we wish the PIC to go to the next
        stage of program.
        Many thanks in advance of any help
        Andrew Farrar