> execute a small flashing LED countdown (one pulse each for 5 seconds)
> and than modulate an IR LED for 20 seconds.  I think I have the TMR0
> interrupt figured out and I can execute seconds timing and 
> LED flashing.

Are you deliberately making trouble for yourself? If not: forget
interrupts for this project. 

When you say 'modulate the IR LED for 20 seconds': if you use standard
IR receivers you must insert gaps in the tranmission, otherwise you will
saturate the receivers.

Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
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docent Hogeschool van Utrecht: www.voti.nl/hvu
 

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