I used 9pin serial | Microcontroller › 8051 › reset the device into isp mode p89v51rd2 › I used 9pin serial May 13, 2013 at 11:05 am #9737 SrinivasanParticipant I used 9pin serial port. After resetting the device in to ISP mode i am getting unable to connect (Transfer/Receive). Any one can help me in solving the issue. In 9 pin serial port i connected only Tx, Rx & Gnd. Whether i need to connect any other pin..
