On Wed, Jul 21, 2010 at 7:47 PM, V G wrote: > On Wed, Jul 21, 2010 at 7:44 PM, V G wrote: >> On Wed, Jul 21, 2010 at 7:34 PM, Oli Glaser wrote: >>> According to the data sheet it can use an external clock up to 64MHz, and a >>> crystal up to 40MHz, so I would guess it should be fine as long as >>> reasonable precautions are taken with regard to trace length, capacitance >>> etc. >> >> But it says maximum 40 MIPS. Is there some way to get more than 40 MIPS? > > 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? Also, the data sheet doesn't say anything about a max 64 MHz clock source for the main oscillator. It only says that for the axillary clock source for peripherals. So I'm guessing I could use an 80 MHz crystal oscillator if I wanted. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist