AT89S52

Dear Sir, I am having a problem with at89s52 on power up. I am doing a project which demands serial communication via serial port. I have gone through one of the threads here, where you had advised one Mr.Bhagirath to use 3-pin rest(MX810). So, I get it that the problem MAY BE in reset button. But, I would also like to share with you the fact that earlier I did not have any arrangement for reset, then it never misbehaved. So, what are the other areas from where this anomaly is rising?

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