Lpc2000

--- In lpc2000@yahoogroups.com, Peter Homann <groups@h...> wrote:
>
> Richard,
> 
> Yes, it had been working. I think I downloaded a Hex file for a 
> processor other than the LPC2138 and then it seemed to stop 
working.
> 
> I don't think it is a hardware problem.
> 
> For the third time, is it possible to erase the boot loader or 
screw it up?
> 
> Cheers,
> 
> Peter.

We need Philips to weigh in on this.  I noticed from the User Manual 
that IAP is prevented from overwriting the boot loader and I would 
expect the loader to protect itself when doing ISP.

Anything is possible but I would look around a little more before I 
worried about the loader.  For example, are you certain that P0.14 
is actally pulled low during reset?  I would look at it with a scope 
or logic probe (LED if I had to) just to be certain something else 
wasn't happening.

I would certainly look at the check box in the lower right corner of 
the Flash Utility window and make sure it was checked - Use DTR/RTS 
for Reset and Boot Loader Selection.  Certainly answers my dumb 
question!  I'll incorporate this concept when I design my board.

Richard