Electronics > Microcontrollers

"state" of a pic pin when pic is off

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Simon:
I know this will be a tough one, but does u-chip guarantee that pins will have a certain state when the pic is off ? It would be helpful if my PWM output pin when high impedance when the pic is not powered but i think maybe I'm hoping for a bit much ?

PeterG:
That is a very interesting question. I am thinking a dso and dmm could answer the question, just program the output pins and see what happens when you power it off.

regards

Simon:
yea, i suppose so, I just wondered if micro chip gave any specific data on the situation to avoid fluke ocurances

jahonen:
Remember that ESD protection diodes are still there, so if you apply voltage to an IO-pin when the device is powered off, you can inadvertently power your MCU via an IO-pin.

Regards,
Janne

Simon:
well any voltage applied will be through a high value resistor, if it were to start the pic that would be great

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