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As opposed to PCINT (Atmel's Pin Change INTerrupt, INTx is arduino-compatible interupt) In other words, does Software Serial use atmel's pin change or arduino falling interrupt?

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SoftwareSerial uses PCINT. AltSoftSerial uses INT0 or INT1, which has FALLING, RISING, CHANGE or LOW LEVEL options. See Section 12.2, p. 71 of the Atmel ATmega328 spec, for example.

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