In message <007601c32202$66eb9520$8288a7cb@joe> Jinx wrote: > > Dallas DS1605 > > What is a DS1605 ? A search of Maxim returns no match so I'm > not sure if the following will be of use to you Whoops, that should have said "DS1305". > I have a similar application and use an interrupt generated by > the chip from a cheap clock to wake the PIC every 2 seconds > to increment its RTC registers That's an interesting way to do things... I'm planning to use Olin's suggestion - use TMR1 to generate the clock. I honestly never knew that TMR1 could run off an external crystal... I thought it needed a TTL input... 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.