In my circuit I need a couple of open drain outputs (for varying the
resistance to ground of a certain point by connecting resistors). However
the PIC I'm using (12f675) has no open drain outputs, so I was wondering
whether it would be possible to simulate this by switching the pin between a
high impedance input and a low output? Are there any flaws I've missed in
this idea? (yes I could use external FETs, but given the reasons for using
an 8-pin PIC, I'm also trying to keep component count down).
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