On Fri, 4 Aug 1995 00:30:08 +0600, Mike Keitz <mkeitz@BEV.NET> wrote:
> As far as conditioning the bus voltage for the PIC, it could be simply
> applied to RTCC through a suitably large resistor to limit the current to
> <500 uA when the protection diode clamps the pin voltage to 5V.  Loading the

Note that the RTCC pin does not have an internal protection diode (to the
postive supply rail) as most of the other pins have.  You will need to add
the diode externally, as shown in Microchip application note AN521.

Eric