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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?
Do you have a timer running other than the serial setup? The fact that something times out in 5 to 7 minutes sounds like a timer not being initialized correctly and after timer overflow the system appears to run.
since the OP is not a believer in a proper "reset arrangement" I hold it far more likely that the uC is running garbage as 'code' and, somehow, after a lot of time, something manages to get it going properly.
Erik
Mr.Malund, I shall not argue that I never believed in proper reset arrangement but thank you, Sir, that you have made me a bliever in it. Sir, the only thing I am asking is that in case after providing the proper reset arrangement, the problem still persists, what should be my next step ?
the only thing I am asking is that in case after providing the proper reset arrangement, the problem still persists, what should be my next step ? with a proper reset supervisor chip, there will be no next step.