>>Anybody have used  the DP8572A ( RTC from National) with a pic? is there
>>some special care?
>>
>>                               Claudia Ximena Bustamante Osorio
>>                               Ingenieria Electronica
>>
I've used a seiko-epson RTC4553 - this has the 32K crystal built into
the package. It can also generate a 1024Hz or 0.1Hz output pulse,
useful for waking the PIC up. It also has some extra NVRAM.
Probably not the cheapest, though!
     ____                                                           ____
   _/ L_/  Mike Harrison / White Wing Logic / wwl@netcomuk.co.uk  _/ L_/
 _/ W_/  Hardware & Software design / PCB Design / Consultancy  _/ W_/
/_W_/  Industrial / Computer Peripherals / Hazardous Area      /_W_/