14

8021AS–AVR–12/06

ATmega329P/3290P

Notes:

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 ATmega329P/3290P 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.

0x26 (0x46)

TCNT0

Timer/Counter0

109

0x25 (0x45)

Reserved

-

-

-

-

-

-

-

-

0x24 (0x44)

TCCR0A

FOC0A

WGM00

COM0A1

COM0A0

WGM01

CS02

CS01

CS00

107

0x23 (0x43)

GTCCR

TSM

-

-

-

-

-

PSR2

PSR10

111/158

0x22 (0x42)

EEARH

-

-

-

-

-

EEPROM Address Register High

23

0x21 (0x41)

EEARL

EEPROM Address Register Low

23

0x20 (0x40)

EEDR

EEPROM Data Register

23

0x1F (0x3F)

EECR

-

-

-

-

EERIE

EEMWE

EEWE

EERE

24

0x1E (0x3E)

GPIOR0

General Purpose I/O Register

27

0x1D (0x3D)

EIMSK

PCIE3

PCIE2

PCIE1

PCIE0

-

-

-INT0

61

0x1C (0x3C)

EIFR

PCIF3

PCIF2

PCIF1

PCIF0

-

-

-INTF0

62

0x1B (0x3B)

Reserved

-

-

-

-

-

-

-

-

0x1A (0x3A)

Reserved

-

-

-

-

-

-

-

-

0x19 (0x39)

Reserved

-

-

-

-

-

-

-

-

0x18 (0x38)

Reserved

-

-

-

-

-

-

-

-

0x17 (0x37)

TIFR2

-

-

-

-

-

-OCF2A

TOV2

158

0x16 (0x36)

TIFR1

-

-ICF1

-

-OCF1B

OCF1A

TOV1

139

0x15 (0x35)

TIFR0

-

-

-

-

-

-OCF0A

TOV0

110

0x14 (0x34)

PORTG

-

-

-

PORTG4

PORTG3

PORTG2

PORTG1

PORTG0

92

0x13 (0x33)

DDRG

-

-

-

DDG4

DDG3

DDG2

DDG1

DDG0

92

0x12 (0x32)

PING

-

-PING5

PING4

PING3

PING2

PING1

PING0

92

0x11 (0x31)

PORTF

PORTF7

PORTF6

PORTF5

PORTF4

PORTF3

PORTF2

PORTF1

PORTF0

92

0x10 (0x30)

DDRF

DDF7

DDF6

DDF5

DDF4

DDF3

DDF2

DDF1

DDF0

92

0x0F (0x2F)

PINFPINF7

PINF6

PINF5

PINF4

PINF3

PINF2

PINF1

PINF0

92

0x0E (0x2E)

PORTE

PORTE7

PORTE6

PORTE5

PORTE4

PORTE3

PORTE2

PORTE1

PORTE0

91

0x0D (0x2D)

DDRE

DDE7

DDE6

DDE5

DDE4

DDE3

DDE2

DDE1

DDE0

91

0x0C (0x2C)

PINEPINE7

PINE6

PINE5

PINE4

PINE3

PINE2

PINE1

PINE0

92

0x0B (0x2B)

PORTD

PORTD7

PORTD6

PORTD5

PORTD4

PORTD3

PORTD2

PORTD1

PORTD0

91

0x0A (0x2A)

DDRD

DDD7

DDD6

DDD5

DDD4

DDD3

DDD2

DDD1

DDD0

91

0x09 (0x29)

PINDPIND7

PIND6

PIND5

PIND4

PIND3

PIND2

PIND1

PIND0

91

0x08 (0x28)

PORTC

PORTC7

PORTC6

PORTC5

PORTC4

PORTC3

PORTC2

PORTC1

PORTC0

91

0x07 (0x27)

DDRC

DDC7

DDC6

DDC5

DDC4

DDC3

DDC2

DDC1

DDC0

91

0x06 (0x26)

PINCPINC7

PINC6

PINC5

PINC4

PINC3

PINC2

PINC1

PINC0

91

0x05 (0x25)

PORTB

PORTB7

PORTB6

PORTB5

PORTB4

PORTB3

PORTB2

PORTB1

PORTB0

90

0x04 (0x24)

DDRB

DDB7

DDB6

DDB5

DDB4

DDB3

DDB2

DDB1

DDB0

90

0x03 (0x23)

PINBPINB7

PINB6

PINB5

PINB4

PINB3

PINB2

PINB1

PINB0

90

0x02 (0x22)

PORTA

PORTA7

PORTA6

PORTA5

PORTA4

PORTA3

PORTA2

PORTA1

PORTA0

90

0x01 (0x21)

DDRA

DDA7

DDA6

DDA5

DDA4

DDA3

DDA2

DDA1

DDA0

90

0x00 (0x20)

PINAPINA7

PINA6

PINA5

PINA4

PINA3

PINA2

PINA1

PINA0

90

Address

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

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