External And Internal Interrupt/Event Line Mapping; Figure 28. External Interrupt/Event Gpio Mapping - STMicroelectronics RM0365 Reference Manual

Interrupts and events
13.2.6

External and internal interrupt/event line mapping

36 interrupt/event lines are available: 8 lines are internal (including the reserved ones); the
remaining 28 lines are external.
The GPIOs are connected to the 16 external interrupt/event lines in the following manner:
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Figure 28. External interrupt/event GPIO mapping

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RM0365