Lpc2000

Hi John,
   
  Had u pulled the P0.14 PIN TO LOW. 
  Since u connected a 10k pull up, just check the pin with a multimeter.
   
  Provide the Power Supply as per in the User Manual.
  or try by inserting external switch on reset.
  I had the same problem in LPC2138. I connected only a 10k pullup to the P0.14 Pin and a i grounded via a jumper. Then in the reset pin i used the same 10k pull up with an external reset switch it worked properly.
   
  U can see the schematic files in the LPC groups.
   
  cheers,
  Rajender
   
   
  

johnsonnenberg99 <johnsonnenberg99@...> wrote:
  My LPC2132 fails to start running about 1/100 power-ups. 99 out of 
100, everything is OK.  
The Symptoms when if fails:
a) Crystal does not oscillate. No voltage on either crystal osc 
pin. 
b) No firmware appears to ever run or initialize anythign in my 
hardware.
c)I/O pins are still inputs. 
d)P0.14 is pulled low by CPU (I have a 10K P/U on it).  This 
symptom baffles me.  

When it is broke, I tried asserting reset low manually.  It does not 
clear the condition.   P0.14 stays stuck low, even with a manual 
reset. (power stays on through the reset. )

I have checked the usual issues (P0.31 is pulled-up w/10K, P0.14 is 
pulled up w/10K, P1.20 is pulled up w/4.7K, PU on all JTAG lines 
except 10K PD on TCK)  

I've got a number of boaords doing this.  Power on, reset was 
assered properly, but XTAL does not start.  CPU appears to be 
dead.    Any ideas would be much appreciated.  

Some I/O pins go to circuits that have zigh-z (>1Mohm) paths to 5V, 
and the 5V does come up before the 3.3.  Could this be it?  

Thanks in advance for any comments.
John











  SPONSORED LINKS 
        Microcontrollers   Microprocessor   Intel microprocessors     Pic microcontrollers 
    
---------------------------------
  YAHOO! GROUPS LINKS 

    
    Visit your group "lpc2000" on the web.
    
    To unsubscribe from this group, send an email to:
 lpc2000-unsubscribe@yahoogroups.com
    
    Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. 

    
---------------------------------
  



				
---------------------------------
 Jiyo cricket on Yahoo! India cricket

[Non-text portions of this message have been removed]