Best Answer Chris Walker , 04 April 2014 - 02:08 AM
The PB11+PC14 tie is not necessary for bootloading, and is there for two reasons:
1. The STM32 micros can support exactly one interrupt per pin # (i.e. PA1 *or* PB1, PB11 *or* PC11). This gives us a bit more flexibility in how we handle button presses.
2. Pin PC14 is available for use in some super-low power modes. We tied it there as an exercise in over-engineering, in case we found a feature which needed those modes.
Chris Go to the full post