Lpc2000

I have had issues with 32 khz crystals when there are digital signals in the
area of the crystal. make sure you have ground plane protecting the crystal
pins
 
Gordon
 

-----Original Message-----
From: lpc2000@yahoogroups.com [mailto:lpc2000@yahoogroups.com] On Behalf Of
Pandurang Shinde
Sent: Wednesday, March 22, 2006 5:35 AM
To: lpc2000@yahoogroups.com
Subject: RE: [lpc2000] Re: RTC problem in 2136


thanks for immediate reply.
Yes i am using external watch crystal of 32 khz. I have also found that i am
not getting oscillation on that board(the board in which i am not getting
RTC updaed value ). But when i used same crystal on other board it( crystal
) seems working,so crystal is fine.
What are the possible reason that i am not getting oscillation with working
crystal

Regards,
Pandurang S.

________________________________

From: lpc2000@yahoogroups.com on behalf of Guillermo Prandi
Sent: Wed 3/22/2006 4:03 PM
To: lpc2000@yahoogroups.com
Subject: [lpc2000] Re: RTC problem in 2136


--- In lpc2000@yahoogroups.com, "Pandurang Shinde" <pandurang@...> 
wrote:
>
> Hi,
>           I am using LPC2136.I am facing some RTC related problems 
in few boards. I am writing some value in RTC on power on but it is 
not incrementing. 
>          This type of problem is not in all board but few of 
them.Some board work without any problem.
>           I also observed that when i use jlink for debug ,value of 
RTC register(SEC,MIN etc) are incrementing ,but these increment are 
slow. When i come out of debug & send data on serial port ,i have 
getting 0 data continously.
>          I have also check VBAT voltage which found ok.
>          Please help me ,if any one can.
>      
> Regards,
> Pandurang S.
> 
> 
> [Non-text portions of this message have been removed]
>

Do you use an external crystal? Have you checked the oscilator pins 
for a 32 KHz wave?

Guille







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