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■ Operation of External Interrupt (INT0 to 2)
The external interrupt sets the interrupt request flag (IF2 to 0) when the falling edge of the input signal is
detected. In this case, if the supported interrupt is enabled (INTxE=1), an interrupt request is generated to
the interrupt controller, whereas if it is disabled, no interrupt request is generated.
The external interrupt can be used for returning the standby status.
Before enabling interrupts, clear the interrupt request flag.