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External Interrupt (EXTI)


Each functional pads are connected to the external interrupt(EXTINT) source.


  • All functional pads can be used as an external interrupt source regardless of any set of pad function.
  • External Interrupt controller has the following functions and can be controlled by registers.
  • Interrupt mask (enable or disable, default : disable)
  • Interrupt polarity (rising or falling, default : rising)

Functional description

All pads are connected to the control register individually. (External interrupt mask register and External Interrupt polarity register)
External interrupt working as following expression:

  • Each pad interrupt = Interrupt mask & (Interrupt polarity ^ Pad input)
  • EXTINT = any Each pad interrupt