Lpc2000

Hello Joel,


From my reading of pg. 33 of UM LPC214x (below), I concluded the core
can be driven with minimum frequency FOSC=12 MHz (with M=4 and
VBPDIV=1 (i.e. pclk=cclk) one gets 48 MHz USB frequency). Am I
mistaken? Where is the quoted 18 MHz coming from?
Please advise.

"Important: if a particular application is using the USB peripheral,
the PLL1 must be configured since this is the only available source of
the 48 MHz clock required by the USB. This limits the selection of
FOSC to either 12 MHz, 16 MHz or 24 MHz."

Best regards

Roger


--- 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
>