Print Page - How to reprogram ISP mode entry

Title: How to reprogram ISP mode entry
Post by: SARAVANAN on July 18, 2013, 03:32:37 AM

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

Title: Re: How to reprogram ISP mode entry
Post by: Andy Ayre on July 19, 2013, 12:43:48 AM

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

Title: Re: How to reprogram ISP mode entry
Post by: SARAVANAN on July 29, 2013, 03:05:18 AM

Thanks for the reply

will try it out.

Thanks again

Flash Magic Forum

In-System Programming Support => P89V51Rx2/P89LV51Rx2 => Topic started by: SARAVANAN on July 18, 2013, 03:32:37 AM