Hello.
I started working on MMA8453Q accelerometer sensor.
I already downloaded datasheet and application notes from NXP site.
But i want to know how to define Interrupt in coding.
Also I want to know how to interface this sensor with MCU for interrupt.
@ashish.talaviya, are you asking about using the MMA8453Q with a Particle device or with an ATMega128? This is a Particle Community supporting the Core, Photo and Electron devices. 
I am just telling that how to interface this sensor with MCU for interrupt. Not necessory for ATmega128.
For the Particle devices, have a look at the docs about attachInterrupt(pin, isr, triggerEdge)