Thanks for guidelines…i did as you said …tried another controller and programmed it sucessfully ..but this controller still running the same code of serial comm. and showing proper results .i.e if we press a –Aa appears on com port output.thats fine.But still cannot programme it again..???? does that programm have a bug or something which is preventing it from being programmed again…??? I didnt get it…….!!!
Pleease help
Thanks…!!!
amianch