How to program ISR's into internal flash

Dear Members

I am trying to program an Interrupt using the example 7.3 from 
AN2109. I am using the example of "Interrupt from a single source--
using C only" from An2109 motorola document.I am using the debug 
version(target). I am able to download the program through my P&E 
BDM cable. 
When I viewed my memory window I found this. The main program and 
the initialization routines for 555,PIT resides in external RAM. The 
interrupt is being generated when the counter value in PIT goes to 
zero and the sipend and sivec and the PS bit is set. But I could not 
find any code in 0x500. What is the reason for this? Should I use a 
different target version( ROM or AUTO FLASH version). Will the 
interrupt service routines be programmed automatically at 0x500 or 
should i program it. If I have to program the ISR how to program it. 
Does anybody know the procedure to program the ISR in internal flash 
CMF module. I am using a mpc555(CME 0555 board revision k3 of the 
processor chip).

Thanks for your help in advance
Sripathy






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