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RE: [lpc2000] Re: Choice of External Frequency (anyone?)

2005-11-15 by Joel Winarske

seangra wrote:

> Anyone have a response to this?
> 
> If I use the LPC2148 am I essentially stuck with a 12MHz external
> crystal if I want to use USB and have the uC running at full speed?

There are two PLLs in the LPC2148.  If you run an external crystal of 12MHz,
the two PLL's allow you to run the CPU at 60MHz, and USB at 48MHz.

Utilizing the Fractional divider in the UART peripheral, you can achieve
nearly any required baud rate.

Does that limit your app?


Joel

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