68300

Presently I am using a TPU Channel to generate a PWM signal, and it 
works as I would like.  However, if possible I would like an 
interrupt to be generated on each rising and falling edge.  In the 
manual, there is a description of what bits to set to either assert 
or not assert an interrupt, but that is about it.  What interrupt 
vecter will be generated if I configure it to assert an interrupt?(I 
would use an ISR)  What edge will it be asserted on?  Will the 
interrupt fire immediately after the edge or before?  

Thanks,
Erik

First of all the TPU issues one interrupt of its own and internally administers of which channel sould that be
If I remember well (I don't have the manual at hand right now) you must set the CISR to point to the first vector of TPU interrupts (should be 80).It means that channel 0 shall activate the ISR pointed by vec.80 ch.1-> 81 etc.
I don't really know if the PWM interrupt shall occur after of before the edge but consider this: perhaps the interrupts occurrs and immediatelly after that the edge rises. Most cases the ISR won't have completed.
Try search the motorola site (e-www.motorola.com) for application notes about PWM (PN17 i think) and engineering bulletins. They offered a great help to me
 Erik Wise <purple_puma@...> wrote:Presently I am using a TPU Channel to generate a PWM signal, and it 
works as I would like.  However, if possible I would like an 
interrupt to be generated on each rising and falling edge.  In the 
manual, there is a description of what bits to set to either assert 
or not assert an interrupt, but that is about it.  What interrupt 
vecter will be generated if I configure it to assert an interrupt?(I 
would use an ISR)  What edge will it be asserted on?  Will the 
interrupt fire immediately after the edge or before?  

Thanks,
Erik


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Erik,

If you are using C, I have some header and initialization files which 
may be useful in describing and using the TPU. Please let me know.

Regards,

Robert Layton

Erik Wise wrote:

> Presently I am using a TPU Channel to generate a PWM signal, and it
> works as I would like.  However, if possible I would like an
> interrupt to be generated on each rising and falling edge.  In the
> manual, there is a description of what bits to set to either assert
> or not assert an interrupt, but that is about it.  What interrupt
> vecter will be generated if I configure it to assert an interrupt?(I
> would use an ISR)  What edge will it be asserted on?  Will the
> interrupt fire immediately after the edge or before? 
>
> Thanks,
> Erik
>
>
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>
>
>
> ---------------------------------------------------
> To unsubscribe from this group, send an email to:
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>
> To learn more about Motorola Microcontrollers, please visit
> http://www.motorola.com/mcu
>
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>
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[Non-text portions of this message have been removed]