Hello,

     I have a circuit with a PIC18F452 and a DS1307 among other components.

     When the PIC is showing current time on an LCD (it reads the
current time from the DS1307 each second), sometimes the display shows
00:00:00 (zero hours, zero minutes, zero seconds) for a reading and then
returns to the correct time.

     It seens there's a communication problem between the PIC and the
1307. This problem was drastically reduced with the use of a 100nF
ceramic cap between pins 4 and 8 (supply) of the DS1307 but it's still
there.

     Someone have seen this before? Is the DS1307 so sensible to noise
on it's supply pins?

     Thank you very much,

     Brusque
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Edson Brusque                     C.I.Tronics Lighting Designers Ltda
Research and Development                   Blumenau  -  SC  -  Brazil
http://www.suporte.ind.br/ryan/netiqueta.htm     www.citronics.com.br
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