Lpc2000

ok, just been reading your threads....

for what its worth, and please pardon me if this isnt the solution 
or you have already considered this... but:


given your crystal, and the pll & vpbdiv settings I calculated the 
following:

YOUR PreInt=0x1C1  and YOUR PreFac = 0.

Now there is some mention in the databook that preint must be >1, 
and there is somemention about prefac containing a 0 however i didnt 
really understand what it was on about.... but, im just wondering if 
there is some issue if prefac is 0...

other questions, which are 'basic' but lets ask and get them out the 
way:

1. are you configuring the vpbdiv and pll FIRST and then configuring 
the RTC?
2. are you enabling the RTC AFTER you have intiialised the fac and 
int?
3. have you tried running with vpbdiv set to 1 (ie resulting in 
60mhz opertion (ish).. i am using that for my system without any 
problem...

well, hope this helps. if not then i hope u get it sorted soon!

kind regards
pete

--- In lpc2000@yahoogroups.com, Robert Adsett <subscriptions@a...> 
wrote:
> At 09:54 AM 10/6/04 -0700, you wrote:
> >Yes I have PLLCFG = 0x23 (MSEL=3 PSEL =1). You had any luck with 
> >configuring rtc's?
> 
> Actually I haven't worked with them at all (for the kind of stuff 
I 
> normally do they strike me as a solution looking for a problem, 
I'd have 
> rather have had a few more timers [even w/o associated output 
pins]) but 
> since you didn't seem to be getting any response I thought I might 
act as a 
> bit of a sounding board.
> 
> I seem to be reading the documentation the same as you so the next 
check 
> was to check that pclk was what you thought it was (it does seem 
to be).  I 
> don't see where your factor of two is coming from either but I'll 
mull it 
> over a bit more.
> 
> Robert
> 
> 
> " 'Freedom' has no meaning of itself.  There are always 
restrictions,
> be they legal, genetic, or physical.  If you don't believe me, try 
to
> chew a radio signal. "
> 
>                          Kelvin Throop, III