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"Unknown Target Connected" After I connected 3v to PF9

Question asked by li.linda.001 on May 22, 2014
Latest reply on May 22, 2014 by li.linda.001
After I connected 3v to PF9, then It happened "Unknown Target Connected". I am not sure it is coincident, or that connection caused some problem in hardware  .
I was planning to use PF9 as ADC to check the voltage.
Please help