In order to use an ATtiny85 as an AVRFID, it is necessary to know the exact inner workings of these microcontrollers.

attiny85_pins

For I/O-operations the pins (2=PB3, 3=PB4, 5=PB0, 6=PB1, 7=PB2) can be used. The configuration of the ports is affected by the three 8-bit registers PORTB (data register), DDRB (data direction register) and PINB (port input pins):

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