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Address
Name
0x1D (0x3D)
EIMSK
0x1C (0x3C)
EIFR
0x1B (0x3B)
PCIFR
0x1A (0x3A)
Reserved
0x19 (0x39)
Reserved
0x18 (0x38)
Reserved
0x17 (0x37)
TIFR2
0x16 (0x36)
TIFR1
0x15 (0x35)
TIFR0
0x14 (0x34)
Reserved
0x13 (0x33)
Reserved
0x12 (0x32)
Reserved
0x11 (0x31)
Reserved
0x10 (0x30)
Reserved
0x0F (0x2F)
Reserved
0x0E (0x2E)
Reserved
0x0D (0x2D)
Reserved
0x0C (0x2C)
Reserved
0x0B (0x2B)
PORTD
0x0A (0x2A)
DDRD
0x09 (0x29)
PIND
0x08 (0x28)
PORTC
0x07 (0x27)
DDRC
0x06 (0x26)
PINC
0x05 (0x25)
PORTB
0x04 (0x24)
DDRB
0x03 (0x23)
PINB
0x02 (0x22)
Reserved
0x01 (0x21)
Reserved
0x0 (0x20)
Reserved
Note:
1. For compatibility with future devices, reserved bits should be written to zero if accessed. Reserved I/O memory addresses
should never be written.
2. I/O Registers within the address range 0x00 - 0x1F are directly bit-accessible using the SBI and CBI instructions. In these
registers, the value of single bits can be checked by using the SBIS and SBIC instructions.
3. Some of the Status Flags are cleared by writing a logical one to them. Note that, unlike most other AVRs, the CBI and SBI
instructions will only operate on the specified bit, and can therefore be used on registers containing such Status Flags. The
CBI and SBI instructions work with registers 0x00 to 0x1F only.
4. When using the I/O specific commands IN and OUT, the I/O addresses 0x00 - 0x3F must be used. When addressing I/O
Registers as data space using LD and ST instructions, 0x20 must be added to these addresses. The
ATmega48PA/88PA/168PA/328P is a complex microcontroller with more peripheral units than can be supported within the 64
location reserved in Opcode for the IN and OUT instructions. For the Extended I/O space from 0x60 - 0xFF in SRAM, only
the ST/STS/STD and LD/LDS/LDD instructions can be used.
5. Only valid for ATmega88PA.
8161DS–AVR–10/09
Bit 7
Bit 6
Bit 5
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
ICF1
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
PORTD7
PORTD6
PORTD5
DDD7
DDD6
DDD5
PIND7
PIND6
PIND5
–
PORTC6
PORTC5
–
DDC6
DDC5
–
PINC6
PINC5
PORTB7
PORTB6
PORTB5
DDB7
DDB6
DDB5
PINB7
PINB6
PINB5
–
–
–
–
–
–
–
–
–
ATmega48PA/88PA/168PA/328P
Bit 4
Bit 3
Bit 2
–
–
–
–
–
–
–
–
PCIF2
–
–
–
–
–
–
–
–
–
–
–
OCF2B
–
–
OCF1B
–
–
OCF0B
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
PORTD4
PORTD3
PORTD2
DDD4
DDD3
DDD2
PIND4
PIND3
PIND2
PORTC4
PORTC3
PORTC2
DDC4
DDC3
DDC2
PINC4
PINC3
PINC2
PORTB4
PORTB3
PORTB2
DDB4
DDB3
DDB2
PINB4
PINB3
PINB2
–
–
–
–
–
–
–
–
–
Bit 1
Bit 0
INT1
INT0
INTF1
INTF0
PCIF1
PCIF0
–
–
–
–
–
–
OCF2A
TOV2
OCF1A
TOV1
OCF0A
TOV0
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
PORTD1
PORTD0
DDD1
DDD0
PIND1
PIND0
PORTC1
PORTC0
DDC1
DDC0
PINC1
PINC0
PORTB1
PORTB0
DDB1
DDB0
PINB1
PINB0
–
–
–
–
–
–
Page
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87
86
86
86
86
86
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11
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