In message <200305241325.JAA17362@www22.ureach.com> Andrew Kieran wrote: > The software controlled oscillator to which Matt refers is also > available on the PIC16F819 and likely on other PICs as well. It > sounds like just what the doctor ordered. The 16F628 can do it too - if it's run off the internal RC oscilator. Now, what I need is a way to keep the RTC running while the chip is running at 32kHz, then the PIC speeds up (on the fly BTW), calculates the hash code, displays it, then drops back down to 32kHz. What I don't want this thing to do is lose any RTC accuracy. The RTC needs to be accurate to within a few seconds per year if possible. Later. -- Phil. philpem@dsl.pipex.com http://www.philpem.dsl.pipex.com/ -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.