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How to use STM32CubeMX's 'pin stacking' function

Question asked by diverger on Sep 13, 2017
Latest reply on Nov 29, 2017 by STM32Cube-T

In the latest version, I find there is a "pin stacking"  choice when configure a pin. But I can't find any description of this function. What's the purpose of this function and how it work?