Hi,
I have got an 89V51RD2BN dev board and unfortunately I programmed the ISP mode entry to run user code, thinking that I can reprogram it to run boot loader later. But now I couldnt enter ISP mode and no autobaud happens. So is there any way I can return back other than a parallel programmer??? Thanks
After reset there is about a 400ms window in which to send a 'U' to the RxD pin. If the device detect the 'U' then it enters the bootloader.
Andy
Thanks for the reply
will try it out.
Thanks again