Lpc2000

Hello everyone,

I've got a bit of a strange problem with the RTC in my setup.  I have a 
dedicated lithium battery going to the Vbat pin to power the RTC, and it 
usually works fine, however periodically the clock changes to an invalid 
value and stops running.  Usually this value is something like "Year:129 
Month:00 Day:16 Hour:02 Min:09 Sec:08", and unless I reset the RTC to a 
valid value it stops running.  This will usually happen after several hours 
of Vcc absent (i.e. device powered off) or after a day or two running 
constantly.  Nothing else is disrupted.  I have a 3.6V lithium running 
through a diode which drops the voltage at the pin down to 3.165V when Vcc 
present and to 3.232V when Vcc absent (implying that more current is drawn 
when the micro is powered on??)

Does anyone have any ideas?

-- Sean