Lpc2000

It is the USB that needs a minimum of 18 MHz, not the core. 
The core can run at 1 MHz, the PLL needs a minimum of 10 MHz and the
USB perpheral needs a minimum VPB frequency of 18 MHz. 
The VPB (or APB in 2103) frequency is the operating frequency divided
by VPBDIV and it defaults to operation frequency divided by 4. So, if
using the USB you need to modify at least the VPBDIV.

hth, Bob

--- In lpc2000@yahoogroups.com, "Guillermo Prandi"
<yahoo.messenger@...> wrote:
>
> I can find where in the LPC214x user's manual says that the minimum 
> clock is 18 MHz. It says 10 MHz. Perhaps you were talking about using 
> the USB periferal?
> 
> Guille
> 
> --- In lpc2000@yahoogroups.com, "Joel Winarske" <joelw@> wrote:
> >
> > Context correction:
> > 
> > > It's not much of a concern for the LPC214x since core needs to 
> run at
> > > minimum 18MHz, but may be an issue on the LPC2101/2/3.
> > 
> > It's not much of a concern for the LPC214x if you are using the USB
> > peripheral since core needs to run at minimum 18MHz, but may be an 
> issue on
> > the LPC2101/2/3.
> > 
> > Joel
> >
>