At 11:38 AM 4/12/00 , you wrote: > Local ex-PIC rep claims to have a customer with 5 Million or so 16C57's > running at 20 MHz AND 3.3 volts. > >Using the built-in oscillator? Merely "running" at 20MHz might be >considerably easier than driving your crystal at 20MHz. (which also implies >that you might be able to get by with replacing the crystal with an >oscillator, if current consumption isn't a big issue...) > >BillW AFAIK, the internal oscillator is indeed running the crystal--but I think I will ask again to be sure. Current draw is an issue. Any experience with crystal vs oscillator? Kelly William K. Borsum, P.E. -- OEM Dataloggers and Instrumentation Systems & San Diego, California, USA