S08jm60 with USB and 32KHZ clock

Discussion created by donw on Aug 31, 2008
Latest reply on Feb 19, 2009 by Moizez
I wish to use the s08jm60 with USB, so the bus speed must be 24mhz.
The data sheet shows an example of using a 4mhz xtal which is divided down to 32khz
to drive the PLL which generates to 48mhz main clock.
I have an external 32khz clock source (from a RTC ic) . Can I use this to feed to PLL, rather than a 4mhz xtal?

The data sheet has AC specs for 5volt operation only.
Can the micro be run at full speed (24mhz bus) at 3.3Volt ?