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halt mode current consumption vs HSE

Question asked by pokorny.ondrej on Mar 11, 2015
Hello,
we are tuning current consumption of our PCB. Microcontroller runs from HSE 16MHz crystal oscillator. When I put it in halt mode, the consumption is 100uA. When I change clock source to HSI and put PA1 and PA2 to GPIO_MODE_OUT_PP_LOW_SLOW just before halt, it decreases to 20uA. Is there any explanation for this?
Thanks for opinions. 

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