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3.12 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)

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

Figure 6 shows the External Interrupt diagram.

PA_00_Polarity

PA_00_mask

PA_00

EXTINT

PA_14_Polarity

PA_14_mask

PA_14

PB_00_Polarity

PB_00_mask

PB_00

PB_03_Polarity

PB_03_mask

PB_03

PC_00_Polarity

PC_00_mask

PC_00

PC_06_Polarity

PC_06_mask

PC_06

PC_08_Polarity

PC_08_mask

PC_08

PC_15_Polarity

PC_15_mask

PC_15

Figure 6. External Interrupt diagram

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