Lpc2000

when i get home i will check this out on my systsem.

I do however have a 12Mhz clock rather than the 14.xx that u are 
using. So my preints and facs will be different.
Im suspecting the problem could well be with your prefac being 0 
given the divider settings...

anyway, i will check it out and re-post for future reference.

glad you got it working !
rgds
pete


--- In lpc2000@yahoogroups.com, "Leighton Rowe" <leightonsrowe@y...> 
wrote:
> 
> > 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...
> 
> Good news!
> 
> After setting VPBDIV = 1 (pclk =cclk) and setting PREINT and 
PREFRAC 
> (based on the user manual), the RTC counted correctly. Thanks 
Pete. 
> The RTC also worked for VPBDIV = 2 (pclk = cclk/2).
> 
> But interestingly, the RTC still counted twice as fast after using 
> VPBDIV = 0. I repeated everything on 2 different lpcs (lpc2114 
> @14.7456MHz & lpc2129 @12MHz). You can even try it out on your 
own; 
> I wouldn't be surprised you'll get the same results. and got the 
> same results. 
> 
> So RTC's OK only when vpbdiv = 1 (pclk=cclk) or 2 (pclk = cclk/2). 
> Otherwise RTC's doubles in speed when vpbdiv = 0 (cclk/4). I hope 
> Philips has an explanation for this one...I have no clue why. 
> 
> For now, I can live with using a different vpbdiv setting to make 
> everything work. 
> 
> Thanks again