How to reprogram ISP mode entry

Started by SARAVANAN, July 18, 2013, 03:32:37 AM

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        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

Andy Ayre

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.

Embedded Systems Academy, Inc.
support at esacademy dot com


Thanks for the reply

will try it out.

Thanks again