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KL03 COMP input problem

Question asked by Michael Schwarz on Apr 24, 2015
Latest reply on Apr 30, 2015 by Michael Schwarz

Hi,

 

I’m trying to create an application on KL03 FRDM which uses CMP0 to detect a signal and generate an interrupt. I configured the DAC output as negative input and a pin (PTA12) as positive input. I’m using KDS and Processor Expert.

 

The problem is the pin which should be the positive input pin has a voltage level of 3V. So it is impossible to detect a rising edge in my signal. Only if I connect the pin to GND and disconnect it again, an interrupt is created because the pin value returns from 0 to 3V. And PTA12 is not the only Pin with a fixed output voltage, there are several others as well.

 

Why is there 3V output on an input pin? Do I have to configure the input pin somewhere else than in the COMP-component as well?

 

Any help is appreciated

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