10.4.2
10.4.3
10.4.4
Port A Data Direction Register – DDRA
Bit
7
6
5
4
3
2
1
0
DDA7
R/W
0
DDA6
R/W
0
DDA5
R/W
0
DDA4
R/W
0
DDA3
R/W
0
DDA2
R/W
0
DDA1
R/W
0
DDA0
R/W
0
DDRA
Read/Write
Initial Value
Port A Input Pins Address – PINA
Bit
7
6
5
4
3
2
1
0
PINA7
R/W
N/A
PINA6
R/W
N/A
PINA5
R/W
N/A
PINA4
R/W
N/A
PINA3
R/W
N/A
PINA2
R/W
N/A
PINA1
R/W
N/A
PINA0
R/W
N/A
PINA
Read/Write
Initial Value
Port B Data Register – PORTB
Bit
7
6
5
4
3
2
1
0
PORTB
7
PORTB
6
PORTB
5
PORTB
4
PORTB
3
PORTB
2
PORTB
1
PORTB
0
PORTB
Read/Write
Initial Value
R/W
0
R/W
0
R/W
0
R/W
0
R/W
0
R/W
0
R/W
0
R/W
0
10.4.5
10.4.6
10.4.7
Port B Data Direction Register – DDRB
Bit
7
6
5
4
3
2
1
0
DDB7
R/W
0
DDB6
R/W
0
DDB5
R/W
0
DDB4
R/W
0
DDB3
R/W
0
DDB2
R/W
0
DDB1
R/W
0
DDB0
R/W
0
DDRB
Read/Write
Initial Value
Port B Input Pins Address – PINB
Bit
7
6
5
4
3
2
1
0
PINB7
R/W
N/A
PINB6
R/W
N/A
PINB5
R/W
N/A
PINB4
R/W
N/A
PINB3
R/W
N/A
PINB2
R/W
N/A
PINB1
R/W
N/A
PINB0
R/W
N/A
PINB
Read/Write
Initial Value
Port C Data Register – PORTC
Bit
7
6
5
4
3
2
1
0
PORTC
7
PORTC
6
PORTC
5
PORTC
4
PORTC
3
PORTC
2
PORTC
1
PORTC
0
PORTC
Read/Write
Initial Value
R/W
0
R/W
0
R/W
0
R/W
0
R/W
0
R/W
0
R/W
0
R/W
0
10.4.8
10.4.9
Port C Data Direction Register – DDRC
Bit
7
6
5
4
3
2
1
0
DDC7
R/W
0
DDC6
R/W
0
DDC5
R/W
0
DDC4
R/W
0
DDC3
R/W
0
DDC2
R/W
0
DDC1
R/W
0
DDC0
R/W
0
DDRC
Read/Write
Initial Value
Port C Input Pins Address – PINC
Bit
7
6
5
4
3
2
1
0
PINC7
R/W
N/A
PINC6
R/W
N/A
PINC5
R/W
N/A
PINC4
R/W
N/A
PINC3
R/W
N/A
PINC2
R/W
N/A
PINC1
R/W
N/A
PINC0
R/W
N/A
PINC
Read/Write
Initial Value
92
AT90USB64/128
7593A–AVR–02/06
ATMEL [ ATMEL ]
