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Dear Andy,
          I have another problem now. I have flashed a code into 8051 which uses serial communication. but when i want to flash another code, i get the error message as UNABLE TO COMMUNICATE(RECEIVE/TRANSMIT).ENSURE NO OTHER APPLICATIONS ARE USING THE COM PORT.

Dear Andy,
      I thanku very much for answerin my queries, I finally resolved it, now its working fine, all i did was uncheckin the use dtr option in advanced settings and unchecked erase all flash and selected erase flash used by hex. thats all.I hope this might help some one. Once again Thanku Andy.

when i try to read device signature, again i get the message reset the hardware into ISP mode now.
once i was successfull. but later when i tried again,i couldn do it.

hi,
  Finally i programmed the device,i have unchecked the use dtr rts option in advanced options and when it displays the warning reset the device into isp mode now,i disconnected power and after a second,i connected the power and it displayed a warning stating that the connected device is wrong and asks yes or no,i clicked on yes and it worked

i had selected the wrong device....but after selecting the right device, i am getting error - reset the device into isp mode now

what am i suppose to do

hi,
  I have been using p89v51rd2 from a long time but when it comes to dumping the code using flash magic,i always get some messages.This time i am getting the message unable to communicate,try reducing the baud rate.

i have tried changing each component,i changed the board along with microcontroller,i tried unchecking use dtr and rts option also but none of these are working.

I am struck here from 3 days,help me