I am trying to use the Arduino 1.0 IDE's SoftwareSerial library with an ATMEGA1284P; on physical pins 24 and 25 (pins 18 and 19 in pins_arduino.h for the standard variant) and I see that I cannot receive on pin 24(18). However, I can transmit successfully on pin 25(19).After research, I now understand that I need to use pins that support 'change interrupts' - which pins on the 1284P support that?
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