MCUCR – MCU Control Register
PORTB – Port B Data Register
DDRB – Port B Data Direction Register
PINB – Port B Input Pins Address
PORTC – Port C Data Register
DDRC – Port C Data Direction Register
PINC – Port C Input Pins Address
DBCR – Debounce Control Register
DBENB – Debounce Enable Register Port B
DBENC – Debounce Enable Register Port C
DBTC – Debounce Timer Compare Register
DBGSW – Debug Support Switch
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