Register Description For I/O Ports - Atmel ATmega48/V Preliminary

10.4

Register Description for I/O Ports

10.4.1 The Port B Data Register – PORTB
10.4.2 The Port B Data Direction Register – DDRB
10.4.3 The Port B Input Pins Address – PINB
10.4.4 The Port C Data Register – PORTC
10.4.5 The Port C Data Direction Register – DDRC
10.4.6 The Port C Input Pins Address – PINC
10.4.7 The Port D Data Register – PORTD
10.4.8 The Port D Data Direction Register – DDRD
2545E–AVR–02/05
Bit 7
PORTB7 PORTB6
Read/Write R/W R/W
Initial Value 0
Bit 7
DDB7 DDB6
Read/Write R/W R/W
Initial Value 0
Bit 7
PINB7 PINB6
Read/Write R
Initial Value N/A N/A
Bit 7
– PORTC6
Read/Write R R/W
Initial Value 0
Bit 7
– DDC6
Read/Write R R/W
Initial Value 0
Bit 7
– PINC6
Read/Write R
Initial Value 0 N/A
Bit 7
PORTD7 PORTD6
Read/Write R/W R/W
Initial Value 0
Bit 7
DDD7 DDD6
Read/Write R/W R/W
Initial Value 0
6 5 4
PORTB5 PORTB4
R/W R/W
0 0 0
6 5 4
DDB5 DDB4
R/W R/W
0 0 0
6 5 4
PINB5 PINB4
R R R
N/A N/A
6 5 4
PORTC5 PORTC4
R/W R/W
0 0 0
6 5 4
DDC5 DDC4
R/W R/W
0 0 0
6 5 4
PINC5 PINC4
R R R
N/A N/A
6 5 4
PORTD5 PORTD4
R/W R/W
0 0 0
6 5 4
DDD5 DDD4
R/W R/W
0 0 0
ATmega48/88/168
3 2 1
PORTB3 PORTB2 PORTB1
R/W R/W R/W
0 0 0
3 2 1
DDB3 DDB2 DDB1
R/W R/W R/W
0 0 0
3 2 1
PINB3 PINB2 PINB1
R R R
N/A N/A N/A
3 2 1
PORTC3 PORTC2 PORTC1
R/W R/W R/W
0 0 0
3 2 1
DDC3 DDC2 DDC1
R/W R/W R/W
0 0 0
3 2 1
PINC3 PINC2 PINC1
R R R
N/A N/A N/A
3 2 1
PORTD3 PORTD2 PORTD1
R/W R/W R/W
0 0 0
3 2 1
DDD3 DDD2 DDD1
R/W R/W R/W
0 0 0
0
PORTB0 PORTB
R/W
0
0
DDB0 DDRB
R/W
0
0
PINB0 PINB
R
N/A
0
PORTC0 PORTC
R/W
0
0
DDC0 DDRC
R/W
0
0
PINC0 PINC
R
N/A
0
PORTD0 PORTD
R/W
0
0
DDD0 DDRD
R/W
0
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