On Fri, Mar 12, 2010 at 7:56 AM, mattschinkel <[email protected]>wrote:
> > Matt, RTCC it's already in the PIC. It needs only the 32768 connected at > > T1OSI/T1OSO. > > Why writing clock-calendar when is already implemented with hardware > > registers? > > Of course it works with TMR1 as well. > > Any reasonable 32768 TCXO or crystal I found in the neighbourhood is > 5ppm, > > no less so be it. > > Because not all PIC's have hardware RTCC and becuase you will only > need 1 oscillator. It's just preference, so it's up to you. > > I am only trying to give you my input, ignore it if you wish. > I can't ignore your input because I was thinking to this option quite long. I'm designing a board with a different philosophy I ever did. The whole device will be powered from 220V and draw quite a lot (up to 500W-1000W or so). But the control board will be battery backup powered (because of some safety requirements) even when device is OFF or unplugged. In this situation I still need low current and maybe a sleeping PIC, but a running RTCC. So far only the 32768 secondary oscillator seems OK for described situation. thx, Vasile > > -- You received this message because you are subscribed to the Google Groups "jallib" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/jallib?hl=en.
