Lpc2000

Hi

From the information you have given I can not say why the ISP is not 
working on your board but I can clear up the MAX202 issue. I have 
several thousand devices in the field using the MAX202 driven from 5V 
(to be precise MAX202ECUE) so there is no problem with this part (if 
used correcty).

I can however confirm from experience that the serial port of the 
LPC2106 (the one I use, but probably generally the case) is very 
sensitive to glitches on its input. In my case I had no problems 
communicating using the FLASH utility but downloads would almost 
always fail until I removed a gate with overshoot in the receive path.

The only thing that I would suggest is to verify the quality of the 
signals and use a low speed to establish communication until you know 
that all is well. Check also that the quarz that you are using doesn't 
have a frequency which makes async communication difficult - don't 
forget that the ISP program has to automatically set its serial baud 
rate when establishing a connection.

Regards

Mark Butcher
www.mjbc.ch


--- In lpc2000@yahoogroups.com, "Rodrigo Cesar da Silva Martins" 
<rodrigocsm@t...> wrote:
>
> I can't make this thing work at all!!! Serial interface works fine, 
> because I tested it using Hiperterminal (I'm using a MAX202, 5V, but 
> I'm sure LPC is 5v tolerant). P0.14 and RESET pins go low, after a 
> while reset goes high and after that P0.14, the way it should be, I 
> think. I receive a data through the serial but the board doesn't 
> respond. I'm using the Philips Flash Utility V2.2.1 and it works 
fine 
> in my MCB2100 board. There is something I am doing wrong? I'm using 
a 
> MOSFET transistor instead of BC850 used in MCB2100, but I don't 
think 
> it's a problem because the high e low levels are just fine.
>