Lpc2000

At 02:37 PM 2/27/2006 +0100, Michal Krestan wrote:
>   Em Seg 27 Fev 2006 09:05, Michal Krestan escreveu:
>   > I need to help with programming LPC2106 via LPC2000 flash utility. 
> I've got
>   > board with one LPC2106 connected via UART0 to COM1. P0.14 is pulled low,
>   > power supply pins are in limits but I can't sucesfully connect with flash
>   > utility. Always I get message "Cannot communicate with test board". 
> X1 and
>   > X2 pins are connected to 7.3728MHz resonator. If I measure data 
> between PC
>   > and LPC2106 it has some response on flash utility requests, but no
>   > success:-( I had several pcs of this hardware working, but this one 
> doesn't
>   > work. I've changed LPC2106 with new one but still with the same result.
>   > Does anybody have idea how to fix this problem?
>   >
>
>   I've tried to use 11.0592MHz crystal, but with same result:-(


Well, it had to be checked.  Have you tried connecting with a 
terminal?  Scoped the lines?  Marginal transceivers and bad connections 
have been reported as causing problems.

>   Maybe isnt the frequency of your crystal?
>   The datasheet says the LPC2106 must have a crystal from 10 to 25MHz, 
> and maybe
>   the Flash program expects at minimum a 10MHz crystal to program the 
> UART0 of
>   the LPC.

Actually the datasheet says the minimum frequency is 1MHz, but 10MHz is 
needed for serial ISP. Some sort of limitation on their autobaud routines 
maybe?

Robert

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