Hallo Ashwin,

specify 'easy'.
For Me AT89C51 or AT89C52 is easiest. Why? Because ALE/PROG# signal tolerance is widest. So, even having timing controlled by only PC, reliable programming is possible. And: No shit with status byte, and such stuff. Just simple parallel programming.
But, of course, if you have an application needing reprogramming micro, that's what I called 'just simple' becomes a night-mare.
So, dear Ashwin, what's easy to YOU, higly depends on your needs...
By the way, what problems do have with your chip?


Bye,
Kai