Hi Andy,
Almost a correct guess. What I'm actually doing is using the capture input
to read from and Analog devices accelerometer (which generates a PWM style
output prop to the G force). But yes the compare part of the CCP is being
used to generate an RC pulse! Actually I think I can simply switch between
the two (I have the time available), I want to keep the two PWM chans to
generate a set of PWM outputs for speed control!

Thanks
Andy


----- Original Message -----
From: "Andrew Kunz" <akunz@tdipower.com>
To: <PICLIST@mitvma.mit.edu>
Sent: Tuesday, October 17, 2000 5:23 PM
Subject: Re: [PIC]: Using 2 CCP: Compare failed if Capture event the same
time


> Andy,
>
> You can still use them as you want I think.  I suspect you want to read a
servo
> pulse in, modify it, and send it out.
>
> If that's the case, you are fine.
>
> Instead of using compare, use one for capture, one for PWM.
>
> The capture one you operate by watching for high, then for low.  The
capture
> input value will give you what Timer1 was at the time of the
rising/falling
> edge.  You only need to subtract to find the pulse width.
>
> For the output channel, you can simply tell it to generate the pulses as
you
> want.  They will be all synched to TMR0 = 0.
>
> Also, timing is not especially critical on either of these things - no
need to
> do it in an interrupt if you aren't really busy.  The values will be
retained
> until the next change.
>
> Think about using TMR2 as a frame timer...
>
> This is what I did for several of my products, and it works fine.
>
> Andy
>
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