Lpc2000

Sounds like a software problem to me - 

 

On the Olimex board, are you starting up from zero in RAM? (Is there a
chance that something else starts up the RTC enable bit)

 

If identical software, running from flash, then it must be hardware.

 

I used the RTC on the '48 and it came up just fine.  You have to :

 

- Set PCONP.P09          RTC Power control bit.  (reset value in '48)

- CCR.P0 = 0                 // enter program mode

- CCR.P1 = 1                 // reset clock

- CCR.P1 = 0                 // allow to run

- CCR.P2 = 0;

- CCR.P3 = 0;                

. CCR.P4 = 1;                // ext osc...

- CCR.P0 = 1;                // Run.

 

You should be able to scope the RTC pins and see the signal 

 

 

 

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From: lpc2000@yahoogroups.com [mailto:lpc2000@yahoogroups.com] On Behalf
Of r_bottleneck
Sent: Sunday, November 27, 2005 7:30 AM
To: lpc2000@yahoogroups.com
Subject: [lpc2000] RTC problem

 

Hello,

I  have a stupid problem with the LPC2138 RTC.

The RTC works with my SW on an Olimex EVB perfectly . However, I
designed an own board and the same SW doesn't start the RTC .

I checked the new board several times it seems to be ok. Also I
checked several different  crystals, as well as different capacitors
without success.VBat is supplied correctly. Even if the RTC clock is
supplied by the internal clock, the RTC does not work.

Is there something I forgot to take care ?

Thanks for any help.









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