Lpc2000

> If the USB is in the VPB range why does the AHB clock matter ?
> Since the lowest xtal freq that can be used with USB is 12Mhz, then the
> minimum clock for the CPU is 24Mhz. is this correct ?
>
> Mauricio

Yes and no.

Yes: With a 12 MHz xtal the minimum CPU frequency is 24 MHz.
No:  You could use a 18 MHz xtal, then the CPU frequency is 18 MHz.

Rob