Probably very simple solution, and I bet I cant see the trees for the forest. However, in my attached schem, the user can select bu use of a micro PCB (Sw1) switch if the device is to use battery power or loop power from an external source. The software in the PIc will go into one of two modes dependant on how its powered. Id lke to use pin6 6 on the switch I think! To set a PIc DI H/L, but Im not sure this is the best idea, since under battery mode the pull upi resistor will draw 3.6uA. I know this isnt a lot, and if I have to live with it I will, but id prefer to lose this draw under loop power mode.
Any better ideas? thanks
Any better ideas? thanks
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