Lpc2000

Hi Leighton

>
> For a good while now, I've been programming new lpc2114s with the 
> Philips ISP Flash utility without problems. 
> 
> Until renctly, I just received an lpc2114 unit that only works 
> partially with the ISP Utility. 

It is almost certainly the hardware. Check the signal on the RX 
line - if it has overshoot or ringing then there will be problems 
(maybe the capacitors on the RS232 transceiver are bad?).

An initial design of mine used a high speed gate in the Rx line 
(TinyLogic) between RS232 transceiver and RX pin. I could establish 
communication but downloads would always fail - in my case somewhere 
in the middle. The fast TinyLogic had spikes at the output 
(overshoot) - once I removed this device I never had problems again.

There are number of posting in the archives about the receiver being 
sensitive to this and most people with problems (if not all) found 
it to be due to signal problems on this line and could solve it 
accordingly.

Regards

Mark Butcher
www.mjbc.ch