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HI

i m using p89v51rd2fn with 12mhz crystal,max 232 for serial progrmming.
i m not able to enter in isp mode. i hav cheked the intgrity of serial line,its fine.

i knw that after reset the 'U' character must be sent to uC to enter in ISP. and flash magic do the same thing.
 
i want to knw details of software and hardware methods to enter in ISP MODE.

wat shld be the status of EA/ , PSEN for entering ISP MODE??
shld  EA/ PIN  pulled high on rest for entering in ISP mode??

plz reply.


NIRBHAY



Post Edited (04-23-06 08:24)

Hi there,

         i m using SBC with P89V51RD2FN , MAX 232,RS 232 CABLE, 12 MHz crystal
i want to program P89V51RD2FN with flash magic in isp mode.

         i m using lateset flash magic version 2.47 (DLL version 1.95). but my problem is whenever i try to communicate thru serial cable i get the error msg saying that  " Reset the device in ISP mode now " with cancal button.

       i have read previous msgs of ur forum for same problem. so i have tried  
          1. resetting the ckt many times when i got error msg.
          2. switch on & off the power supply.
 
   but still i have the same problem the chip is new one. Is there any other solution? or should i have to depend upon parallel programmer?

       Plz help me. Wating for reply.

       Nirbhay.