When a logic change
on any PCINT[7:0] pin triggers an interrupt request, PCIF0 becomes set (one). If the
I-bit in SREG and the PCIE0 bit in PCICR are set (one), the MCU will jump to the
corresponding Interrupt Vector. The flag is cleared when the interrupt routine is
executed. Alternatively, the flag can be cleared by writing a logical one to
it.
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