V G wrote: > Oh! I just realized that the instruction clock is half of the > oscillator frequency. So I can still go with a 40 MHz crystal > oscillator and double it via PLL to 80 MHz to get the full 40 MIPS out > of it? This is getting silly. READ THE DATASHEET, particularly the whole oscillator section and the electrical characteristics pertaining to the oscillator. ******************************************************************** Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products (978) 742-9014. Gold level PIC consultants since 2000. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist