On 6/12/08, Matthew Miller wrote: > So my question is this: how has the technology changed? Is a mini ceramic > resonator present in these new chips? :) Or is it just a better designed RC > oscillator? In the case of 16F689, it is just a better designed RC oscillator. Maybe this just because of the process. Maybe Microchip added some circuitry. Microchip's internal RC is still not as good. For example, you can not use the internal RC oscillator for USB 18F PICs (like 18F2550/18F4550). Silicon Labs C8051F 3xx USB MCUs can actually use internal RC oscillator for USB operations. I think they add quite some circuitry to achieve that. Xiaofan -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist