Hello to all,
  I need advice with a "problem" I've found: I'm working in a project with
a PIC16F84-04/P that will be connected to a Pc using the parallel port. An
input pin (RA1) of the PIC is connected to an out (D0) of the LPT port,
and, because the circuit may be connected or not, I decided to add a
pull-up resistor of *330K* to the pin, forcing a high level when the PC is
not connected.
  And now the problem: the current from the pin of parallel port at logic
level high seems to feed the entire PIC circuit, because it runs even
without power. The voltage across the pull-up resistor is 1.2V, so I supose
that the PIC chip is consumming 3.6 microAmps. Of course, I'm not using the
SLEEP mode and there is not short-circuits in the PCB. May be that the
current flows internally from the RA1 ping to Vcc??? It seems very strange,
Any suggestions???
 Thanks in advance.


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