DocID025832 Rev 2
STM32F042xx
Functional overview
27
Figure 2. Clock tree
3.7
General-purpose inputs/outputs (GPIOs)
Each of the GPIO pins can be configured by software as output (push-pull or open-drain), as
input (with or without pull-up or pull-down) or as peripheral alternate function. Most of the
GPIO pins are shared with digital or analog alternate functions.
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