4 register description, 1 mcucr – mcu control register, 2 porta – port a data register – Rainbow Electronics ATtiny43U User Manual
Page 78: 3 ddra – port a data direction register, 4 pina – port a input pins address, 5 portb – port b data register, 6 ddrb – port b data direction register, 7 pinb – port binput pins address, Attiny43u
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