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STM32L0 GPIOA_MODER A4 default value

Question asked by Uwe Bonnes on Jan 6, 2015
Hello,

the STM32L0 series sets nearly all GPIO to analog mode as default. This does make sense opposed to the "default to input" on other family that may result in high current draw with floating inputs. Only Port A pin 4, 13 and 14 have other defaults. For pin 13 and 14 this is for the SWD function. However I don't see why PA4 is treated different than the rest of the pins?

Any explanation?

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