On Wed, Mar 10, 2010 at 11:30 PM, m...@watty <wattym...@gmail.com> wrote:
> > > On Mar 10, 5:45 pm, vasile surducan <vsurdu...@gmail.com> wrote: > > > This is not necessary since there is available a calibration register. > > That's nice. > > You'll want either NPO capacitors, or possibly quality Pxxx or Nxxx > depending on temperature coefficient of crystal. > > I wonder how you decide what to put in calibration register? > There is a programable RTCC pin which cand be programmed for 1Hz (or 0.5Hz, I don't remember exactly) output. Using a periodmeter this time can be measured accurately and calibration register incremented or decremented untill the right time is seen. However I dislike this RTCC as well I dislike the tuning method for zero error clock using TMR0. Unfortunately I need zero error clock for some time-base. I think I'll go for a TCXO. > > -- > You received this message because you are subscribed to the Google Groups > "jallib" group. > To post to this group, send email to jal...@googlegroups.com. > To unsubscribe from this group, send email to > jallib+unsubscr...@googlegroups.com<jallib%2bunsubscr...@googlegroups.com> > . > For more options, visit this group at > http://groups.google.com/group/jallib?hl=en. > > -- You received this message because you are subscribed to the Google Groups "jallib" group. To post to this group, send email to jal...@googlegroups.com. To unsubscribe from this group, send email to jallib+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/jallib?hl=en.
