68300

Thanks Andrei,

One of the solutions I am thinking about would be similar
to the one you suggested.
In effect, I would use the ITC to generate an interrupt 
and a link to a QOM (Queued Output Match) function on the
falling edge of the incoming signal. The QOM function
would be programmed to generate an immediate low pulse
with an extremely long duration.  In the ITC ISR I would
then reprogram the ITC to generate an interrupt (no link)
on the following rising edge.
Once the rising edge ITC interrupt occurs, the associated
ISR can calculate the just expired low pulse time, and
use it to update the QOM low time (which is still extremely long)
with the appropriate value, i.e. T=(T1 * X) + Y.
In this case, X would be 0.0 to 1.0.

That's how far I got for now.  I think it might be time to quit
the theoretical discussion and start experimenting....

Alwin

-----Original Message-----
From: Andrei Chichak [mailto:acpmiedm@...]
Sent: Thursday, March 20, 2003 8:17 AM
To: 68300@yahoogroups.com
Subject: Re: [68300] Does anybody have a TPU solution for this?


What you have is similar to what is needed for the ITC and PSP functions. 
This is similar to what happens in an automotive fuel injection system. The 
problem being that you don't have the PMM/PMA signal for position timing 
for PSP (See TPUPN14/D)

How about this use ITC to generate a link to OC as described inTPUPN16/D 
and TPUPN12/D pages 1 and 2?

TPUPN14/D describes how to set up ITC to generate a link after a single
pulse.

Andrei

At 04:30 PM 3/19/2003 -0800, you wrote:
>Hello group,
>
>does anybody of you guys know of some nifty
>way to solve the following problem:
>
>I have an incoming signal (low pulse with a period T1)
>at one TPU channel and need to generate a new signal
>at another TPU channel with the following period:
>T2 = (T1 * X) + Y,
>where X would be a multiplier from 1.0 to 2.0
>and Y some additional time.
>
>It would be great to have this done automatically
>with two TPU functions that are linked.  The CPU would
>have to update the terms X and Y at whatever time
>interval is desired.
>
>If anybody had to deal with something similar,
>I would be interested in any suggestions.
>
>Thanks,
>Alwin
>
>
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