Hello @ughadge ,
I have implemented for S12ZVL. For MC9S12XEP100 it might be same. In CodeWarrior you can add TimerInt module
chaitanya_kalya_1-1600867289470.png
Set the interrupt period
chaitanya_kalya_2-1600867388413.png
and your ISR will be generated in Event.c file
chaitanya_kalya_0-1600923967237.png
That's done.