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Features

• High Performance, Low Power AVR^®8-Bit Microcontroller

• Advanced RISC Architecture

– 131 Powerful Instructions – Most Single Clock Cycle Execution

– 32 x 8 General Purpose Working Registers

– Fully Static Operation

– Up to 20 MIPS Throughput at 20 MHz

– On-chip 2-cycle Multiplier

• High Endurance Non-volatile Memory Segments

– 4/8/16/32K Bytes of In-System Self-Programmable Flash program memory

– 256/512/512/1K Bytes EEPROM

8-bit

– 512/1K/1K/2K Bytes Internal SRAM

– Write/Erase Cycles: 10,000 Flash/100,000 EEPROM

– Data retention: 20 years at 85°C/100 years at 25°C⁽¹⁾

– Optional Boot Code Section with Independent Lock Bits

In-System Programming by On-chip Boot Program

True Read-While-Write Operation

Microcontroller

with 4/8/16/32K

Bytes In-System

Programmable

Flash

– Programming Lock for Software Security

• Peripheral Features

– Two 8-bit Timer/Counters with Separate Prescaler and Compare Mode

– One 16-bit Timer/Counter with Separate Prescaler, Compare Mode, and Capture

Mode

– Real Time Counter with Separate Oscillator

– Six PWM Channels

– 8-channel 10-bit ADC in TQFP and QFN/MLF package

Temperature Measurement

– 6-channel 10-bit ADC in PDIP Package

Temperature Measurement

ATmega48A

ATmega48PA

ATmega88A

ATmega88PA

ATmega168A

ATmega168PA

ATmega328

– Programmable Serial USART

– Master/Slave SPI Serial Interface

– Byte-oriented 2-wire Serial Interface (Philips I²C compatible)

– Programmable Watchdog Timer with Separate On-chip Oscillator

– On-chip Analog Comparator

– Interrupt and Wake-up on Pin Change

• Special Microcontroller Features

– Power-on Reset and Programmable Brown-out Detection

– Internal Calibrated Oscillator

– External and Internal Interrupt Sources

– Six Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down, Standby,

and Extended Standby

• I/O and Packages

ATmega328P

– 23 Programmable I/O Lines

– 28-pin PDIP, 32-lead TQFP, 28-pad QFN/MLF and 32-pad QFN/MLF

• Operating Voltage:

– 1.8 - 5.5V

• Temperature Range:

– -40°C to 85°C

• Speed Grade:

Summary

– 0 - 4 MHz@1.8 - 5.5V, 0 - 10 MHz@2.7 - 5.5.V, 0 - 20 MHz @ 4.5 - 5.5V

• Power Consumption at 1 MHz, 1.8V, 25°C

– Active Mode: 0.2 mA

– Power-down Mode: 0.1 µA

– Power-save Mode: 0.75 µA (Including 32 kHz RTC)

Rev. 8271BS–AVR–04/10

ATmega48A/48PA/88A/88PA/168A/168PA/328/328P

1. Pin Configurations

Figure 1-1. Pinout ATmega48A/48PA/88A/88PA/168A/168PA/328/328P

PDIP

TQFP Top View

(PCINT14/RESET) PC6

(PCINT16/RXD) PD0

(PCINT17/TXD) PD1

(PCINT18/INT0) PD2

(PCINT19/OC2B/INT1) PD3

(PCINT20/XCK/T0) PD4

VCC

1

2

3

4

5

6

7

8

9

28 PC5 (ADC5/SCL/PCINT13)

27 PC4 (ADC4/SDA/PCINT12)

26 PC3 (ADC3/PCINT11)

25 PC2 (ADC2/PCINT10)

24 PC1 (ADC1/PCINT9)

23 PC0 (ADC0/PCINT8)

22 GND

(PCINT19/OC2B/INT1) PD3

1

2

3

4

5

6

7

8

24 PC1 (ADC1/PCINT9)

23 PC0 (ADC0/PCINT8)

22 ADC7

(PCINT20/XCK/T0) PD4

GND

VCC

GND

21 GND

20 AREF

GND

21 AREF

VCC

19 ADC6

(PCINT6/XTAL1/TOSC1) PB6

20 AVCC

(PCINT6/XTAL1/TOSC1) PB6

(PCINT7/XTAL2/TOSC2) PB7

18 AVCC

(PCINT7/XTAL2/TOSC2) PB7 10

(PCINT21/OC0B/T1) PD5 11

(PCINT22/OC0A/AIN0) PD6 12

(PCINT23/AIN1) PD7 13

19 PB5 (SCK/PCINT5)

18 PB4 (MISO/PCINT4)

17 PB3 (MOSI/OC2A/PCINT3)

16 PB2 (SS/OC1B/PCINT2)

15 PB1 (OC1A/PCINT1)

17 PB5 (SCK/PCINT5)

(PCINT0/CLKO/ICP1) PB0 14

32 MLF Top View

28 MLF Top View

(PCINT19/OC2B/INT1) PD3

PC1 (ADC1/PCINT9)

PC0 (ADC0/PCINT8)

ADC7

1

2

3

4

5

6

7

8

24

23

22

21

20

19

18

17

(PCINT19/OC2B/INT1) PD3

(PCINT20/XCK/T0) PD4

VCC

PC2 (ADC2/PCINT10)

PC1 (ADC1/PCINT9)

PC0 (ADC0/PCINT8)

GND

1

2

3

4

5

6

7

21

20

19

18

17

16

15

(PCINT20/XCK/T0) PD4

GND

VCC

GND

AREF

(PCINT6/XTAL1/TOSC1) PB6

(PCINT7/XTAL2/TOSC2) PB7

(PCINT21/OC0B/T1) PD5

AREF

VCC

ADC6

AVCC

(PCINT6/XTAL1/TOSC1) PB6

(PCINT7/XTAL2/TOSC2) PB7

AVCC

PB5 (SCK/PCINT5)

NOTE: Bottom pad should be soldered to ground.

2

8271BS–AVR–04/10

ATmega48A/48PA/88A/88PA/168A/168PA/328/328P

1.1

Pin Descriptions

1.1.1

VCC

Digital supply voltage.

1.1.2

1.1.3

GND

Ground.

Port B (PB7:0) XTAL1/XTAL2/TOSC1/TOSC2

Port B is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The

Port B output buffers have symmetrical drive characteristics with both high sink and source

capability. As inputs, Port B pins that are externally pulled low will source current if the pull-up

resistors are activated. The Port B pins are tri-stated when a reset condition becomes active,

even if the clock is not running.

Depending on the clock selection fuse settings, PB6 can be used as input to the inverting Oscil-

lator amplifier and input to the internal clock operating circuit.

Depending on the clock selection fuse settings, PB7 can be used as output from the inverting

Oscillator amplifier.

If the Internal Calibrated RC Oscillator is used as chip clock source, PB7...6 is used as

TOSC2...1 input for the Asynchronous Timer/Counter2 if the AS2 bit in ASSR is set.

The various special features of Port B are elaborated in and ”System Clock and Clock Options”

on page 26.

1.1.4

1.1.5

Port C (PC5:0)

PC6/RESET

Port C is a 7-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The

PC5...0 output buffers have symmetrical drive characteristics with both high sink and source

capability. As inputs, Port C pins that are externally pulled low will source current if the pull-up

resistors are activated. The Port C pins are tri-stated when a reset condition becomes active,

even if the clock is not running.

If the RSTDISBL Fuse is programmed, PC6 is used as an I/O pin. Note that the electrical char-

acteristics of PC6 differ from those of the other pins of Port C.

If the RSTDISBL Fuse is unprogrammed, PC6 is used as a Reset input. A low level on this pin

for longer than the minimum pulse length will generate a Reset, even if the clock is not running.

The minimum pulse length is given in Table 28-12 on page 323. Shorter pulses are not guaran-

teed to generate a Reset.

The various special features of Port C are elaborated in ”Alternate Functions of Port C” on page

86.

1.1.6

Port D (PD7:0)

Port D is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The

Port D output buffers have symmetrical drive characteristics with both high sink and source

capability. As inputs, Port D pins that are externally pulled low will source current if the pull-up

resistors are activated. The Port D pins are tri-stated when a reset condition becomes active,

even if the clock is not running.

3

8271BS–AVR–04/10

ATmega48A/48PA/88A/88PA/168A/168PA/328/328P

The various special features of Port D are elaborated in ”Alternate Functions of Port D” on page

89.

1.1.7

AV_CC

AV_CCis the supply voltage pin for the A/D Converter, PC3:0, and ADC7:6. It should be externally

connected to V_CC, even if the ADC is not used. If the ADC is used, it should be connected to V_CC

through a low-pass filter. Note that PC6...4 use digital supply voltage, V_CC

.

1.1.8

1.1.9

AREF

AREF is the analog reference pin for the A/D Converter.

ADC7:6 (TQFP and QFN/MLF Package Only)

In the TQFP and QFN/MLF package, ADC7:6 serve as analog inputs to the A/D converter.

These pins are powered from the analog supply and serve as 10-bit ADC channels.

4

8271BS–AVR–04/10

ATmega48A/48PA/88A/88PA/168A/168PA/328/328P

2. Overview

The ATmega48A/48PA/88A/88PA/168A/168PA/328/328P is a low-power CMOS 8-bit microcon-

troller based on the AVR enhanced RISC architecture. By executing powerful instructions in a

single clock cycle, the ATmega48A/48PA/88A/88PA/168A/168PA/328/328P achieves through-

puts approaching 1 MIPS per MHz allowing the system designer to optimize power consumption

versus processing speed.

2.1

Block Diagram

Figure 2-1. Block Diagram

Watchdog

Timer

Power

Supervision

POR / BOD &

RESET

debugWIRE

Watchdog

Oscillator

PROGRAM

LOGIC

Oscillator

Circuits /

Clock

Flash

SRAM

Generation

CPU

EEPROM

AVCC

AREF

GND

2

8bit T/C 0

8bit T/C 2

16bit T/C 1

A/D Conv.

Analog

Comp.

Internal

Bandgap

6

USART 0

PORT D (8)

PD[0..7]

SPI

PORT B (8)

PB[0..7]

TWI

PORT C (7)

PC[0..6]

RESET

XTAL[1..2]

ADC[6..7]

The AVR core combines a rich instruction set with 32 general purpose working registers. All the

32 registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two independent

5

8271BS–AVR–04/10

ATmega48A/48PA/88A/88PA/168A/168PA/328/328P

registers to be accessed in one single instruction executed in one clock cycle. The resulting

architecture is more code efficient while achieving throughputs up to ten times faster than con-

ventional CISC microcontrollers.

The ATmega48A/48PA/88A/88PA/168A/168PA/328/328P provides the following features:

4K/8K bytes of In-System Programmable Flash with Read-While-Write capabilities,

256/512/512/1K bytes EEPROM, 512/1K/1K/2K bytes SRAM, 23 general purpose I/O lines, 32

general purpose working registers, three flexible Timer/Counters with compare modes, internal

and external interrupts, a serial programmable USART, a byte-oriented 2-wire Serial Interface,

an SPI serial port, a 6-channel 10-bit ADC (8 channels in TQFP and QFN/MLF packages), a pro-

grammable Watchdog Timer with internal Oscillator, and five software selectable power saving

modes. The Idle mode stops the CPU while allowing the SRAM, Timer/Counters, USART, 2-wire

Serial Interface, SPI port, and interrupt system to continue functioning. The Power-down mode

saves the register contents but freezes the Oscillator, disabling all other chip functions until the

next interrupt or hardware reset. In Power-save mode, the asynchronous timer continues to run,

allowing the user to maintain a timer base while the rest of the device is sleeping. The ADC

Noise Reduction mode stops the CPU and all I/O modules except asynchronous timer and ADC,

to minimize switching noise during ADC conversions. In Standby mode, the crystal/resonator

Oscillator is running while the rest of the device is sleeping. This allows very fast start-up com-

bined with low power consumption.

The device is manufactured using Atmel’s high density non-volatile memory technology. The

On-chip ISP Flash allows the program memory to be reprogrammed In-System through an SPI

serial interface, by a conventional non-volatile memory programmer, or by an On-chip Boot pro-

gram running on the AVR core. The Boot program can use any interface to download the

application program in the Application Flash memory. Software in the Boot Flash section will

continue to run while the Application Flash section is updated, providing true Read-While-Write

operation. By combining an 8-bit RISC CPU with In-System Self-Programmable Flash on a

monolithic chip, the Atmel ATmega48A/48PA/88A/88PA/168A/168PA/328/328P is a powerful

microcontroller that provides a highly flexible and cost effective solution to many embedded con-

trol applications.

The ATmega48A/48PA/88A/88PA/168A/168PA/328/328P AVR is supported with a full suite of

program and system development tools including: C Compilers, Macro Assemblers, Program

Debugger/Simulators, In-Circuit Emulators, and Evaluation kits.

2.2

Comparison Between Processors

The ATmega48A/48PA/88A/88PA/168A/168PA/328/328P differ only in memory sizes, boot

loader support, and interrupt vector sizes. Table 2-1 summarizes the different memory and inter-

rupt vector sizes for the devices.

Table 2-1.

Device

Memory Size Summary

Flash

EEPROM

RAM

Interrupt Vector Size

ATmega48A

ATmega48PA

ATmega88A

ATmega88PA

ATmega168A

4K Bytes

8K Bytes

16K Bytes

256 Bytes

512 Bytes

1K Bytes

1 instruction word/vector

2 instruction words/vector

6

8271BS–AVR–04/10

ATmega48A/48PA/88A/88PA/168A/168PA/328/328P

Table 2-1.

Memory Size Summary

Device

Flash

EEPROM

RAM

Interrupt Vector Size

ATmega168PA

ATmega328

ATmega328P

16K Bytes

32K Bytes

512 Bytes

1K Bytes

2K Bytes

2 instruction words/vector

ATmega48A/48PA/88A/88PA/168A/168PA/328/328P support a real Read-While-Write Self-Pro-

gramming mechanism. There is a separate Boot Loader Section, and the SPM instruction can

only execute from there. In ATmega 48A/48PA there is no Read-While-Write support and no

separate Boot Loader Section. The SPM instruction can execute from the entire Flash.

3. Resources

A comprehensive set of development tools, application notes and datasheets are available for

download on http://www.atmel.com/avr.

Note:

1.

7

8271BS–AVR–04/10

ATmega48A/48PA/88A/88PA/168A/168PA/328/328P

4. Register Summary

Address

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Page

(0xFF)

(0xFE)

(0xFD)

(0xFC)

(0xFB)

(0xFA)

(0xF9)

(0xF8)

(0xF7)

(0xF6)

(0xF5)

(0xF4)

(0xF3)

(0xF2)

(0xF1)

(0xF0)

(0xEF)

(0xEE)

(0xED)

(0xEC)

(0xEB)

(0xEA)

(0xE9)

(0xE8)

(0xE7)

(0xE6)

(0xE5)

(0xE4)

(0xE3)

(0xE2)

(0xE1)

(0xE0)

(0xDF)

(0xDE)

(0xDD)

(0xDC)

(0xDB)

(0xDA)

(0xD9)

(0xD8)

(0xD7)

(0xD6)

(0xD5)

(0xD4)

(0xD3)

(0xD2)

(0xD1)

(0xD0)

(0xCF)

(0xCE)

(0xCD)

(0xCC)

(0xCB)

(0xCA)

(0xC9)

(0xC8)

(0xC7)

(0xC6)

(0xC5)

(0xC4)

(0xC3)

(0xC2)

Reserved

UDR0

–

USART I/O Data Register

196

200

UBRR0H

UBRR0L

Reserved

UCSR0C

USART Baud Rate Register High

USART Baud Rate Register Low

–

UCSZ01 /UDORD0

UCSZ00 / UCPHA0

UMSEL01

UMSEL00

UPM01

UPM00

USBS0

UCPOL0

198/213

8

8271BS–AVR–04/10

ATmega48A/48PA/88A/88PA/168A/168PA/328/328P

Address

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Page

(0xC1)

(0xC0)

(0xBF)

(0xBE)

(0xBD)

(0xBC)

(0xBB)

(0xBA)

(0xB9)

(0xB8)

(0xB7)

(0xB6)

(0xB5)

(0xB4)

(0xB3)

(0xB2)

(0xB1)

(0xB0)

(0xAF)

(0xAE)

(0xAD)

(0xAC)

(0xAB)

(0xAA)

(0xA9)

(0xA8)

(0xA7)

(0xA6)

(0xA5)

(0xA4)

(0xA3)

(0xA2)

(0xA1)

(0xA0)

(0x9F)

(0x9E)

(0x9D)

(0x9C)

(0x9B)

(0x9A)

(0x99)

(0x98)

(0x97)

(0x96)

(0x95)

(0x94)

(0x93)

(0x92)

(0x91)

(0x90)

(0x8F)

(0x8E)

(0x8D)

(0x8C)

(0x8B)

(0x8A)

(0x89)

(0x88)

(0x87)

(0x86)

(0x85)

(0x84)

(0x83)

(0x82)

(0x81)

(0x80)

UCSR0B

UCSR0A

Reserved

TWAMR

TWCR

RXCIE0

RXC0

–

TXCIE0

TXC0

–

UDRIE0

UDRE0

–

RXEN0

FE0

TXEN0

DOR0

–

UCSZ02

UPE0

–

RXB80

TXB80

197

196

U2X0

MPCM0

–

TWAM0

–

TWAM6

TWINT

TWAM5

TWEA

TWAM4

TWSTA

TWAM3

TWSTO

TWAM2

TWWC

TWAM1

TWEN

–

245

242

244

245

244

242

TWIE

TWDR

2-wire Serial Interface Data Register

TWAR

TWA6

TWS7

TWA5

TWS6

TWA4

TWS5

TWA3

TWS4

TWA2

TWS3

TWA1

–

TWA0

TWGCE

TWPS0

TWSR

TWPS1

TWBR

2-wire Serial Interface Bit Rate Register

Reserved

ASSR

–

AS2

–

TCN2UB

–

OCR2AUB

–

OCR2BUB

–

TCR2AUB

–

TCR2BUB

–

EXCLK

–

165

Reserved

OCR2B

Timer/Counter2 Output Compare Register B

Timer/Counter2 Output Compare Register A

Timer/Counter2 (8-bit)

163

162

OCR2A

TCNT2

TCCR2B

TCCR2A

Reserved

OCR1BH

OCR1BL

OCR1AH

OCR1AL

ICR1H

FOC2A

FOC2B

–

WGM22

CS22

–

CS21

CS20

COM2A1

COM2A0

COM2B1

COM2B0

–

WGM21

WGM20

159

–

Timer/Counter1 - Output Compare Register B High Byte

Timer/Counter1 - Output Compare Register B Low Byte

Timer/Counter1 - Output Compare Register A High Byte

Timer/Counter1 - Output Compare Register A Low Byte

Timer/Counter1 - Input Capture Register High Byte

Timer/Counter1 - Input Capture Register Low Byte

Timer/Counter1 - Counter Register High Byte

139

ICR1L

TCNT1H

TCNT1L

Reserved

TCCR1C

TCCR1B

TCCR1A

Timer/Counter1 - Counter Register Low Byte

–

FOC1A

ICNC1

COM1A1

FOC1B

ICES1

COM1A0

–

WGM12

–

138

137

135

WGM13

COM1B0

CS12

–

CS11

WGM11

CS10

WGM10

COM1B1

9

8271BS–AVR–04/10

ATmega48A/48PA/88A/88PA/168A/168PA/328/328P

Address

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Page

(0x7F)

(0x7E)

DIDR1

DIDR0

–

ADC3D

–

AIN1D

ADC1D

–

AIN0D

ADC0D

–

250

267

–

ADC5D

–

ADC4D

ADC2D

–

(0x7D)

Reserved

ADMUX

ADCSRB

ADCSRA

ADCH

–

(0x7C)

REFS1

–

REFS0

ACME

ADSC

ADLAR

–

MUX3

–

MUX2

ADTS2

ADPS2

MUX1

ADTS1

ADPS1

MUX0

ADTS0

ADPS0

263

266

264

266

(0x7B)

–

(0x7A)

ADEN

ADATE

ADIF

ADIE

(0x79)

ADC Data Register High byte

ADC Data Register Low byte

(0x78)

ADCL

(0x77)

Reserved

TIMSK2

TIMSK1

TIMSK0

PCMSK2

PCMSK1

PCMSK0

Reserved

EICRA

–

(0x76)

–

(0x75)

–

(0x74)

–

(0x73)

–

(0x72)

–

(0x71)

–

(0x70)

–

OCIE2B

OCIE1B

OCIE0B

PCINT18

PCINT10

PCINT2

–

OCIE2A

OCIE1A

OCIE0A

PCINT17

PCINT9

PCINT1

–

TOIE2

TOIE1

TOIE0

PCINT16

PCINT8

PCINT0

–

164

140

112

75

(0x6F)

–

ICIE1

–

(0x6E)

–

PCINT19

PCINT11

PCINT3

–

(0x6D)

PCINT23

PCINT22

PCINT21

PCINT20

(0x6C)

–

PCINT14

PCINT13

PCINT12

75

(0x6B)

PCINT7

PCINT6

PCINT5

PCINT4

75

(0x6A)

–

(0x69)

ISC11

–

ISC10

PCIE2

–

ISC01

PCIE1

–

ISC00

PCIE0

–

72

(0x68)

PCICR

(0x67)

Reserved

OSCCAL

Reserved

PRR

–

(0x66)

Oscillator Calibration Register

37

42

(0x65)

–

(0x64)

PRTWI

PRTIM2

PRTIM0

–

PRTIM1

PRSPI

PRUSART0

PRADC

(0x63)

Reserved

CLKPR

–

(0x62)

–

(0x61)

CLKPCE

–

CLKPS3

CLKPS2

CLKPS1

CLKPS0

37

55

9

(0x60)

WDTCSR

SREG

WDIF

WDIE

WDP3

WDCE

WDE

WDP2

WDP1

WDP0

0x3F (0x5F)

0x3E (0x5E)

0x3D (0x5D)

0x3C (0x5C)

0x3B (0x5B)

0x3A (0x5A)

0x39 (0x59)

0x38 (0x58)

0x37 (0x57)

0x36 (0x56)

0x35 (0x55)

0x34 (0x54)

0x33 (0x53)

0x32 (0x52)

0x31 (0x51)

0x30 (0x50)

0x2F (0x4F)

0x2E (0x4E)

0x2D (0x4D)

0x2C (0x4C)

0x2B (0x4B)

0x2A (0x4A)

0x29 (0x49)

0x28 (0x48)

0x27 (0x47)

0x26 (0x46)

0x25 (0x45)

0x24 (0x44)

0x23 (0x43)

0x22 (0x42)

0x21 (0x41)

0x20 (0x40)

0x1F (0x3F)

0x1E (0x3E)

I

T

H

S

V

N

Z

C

SPH

–

(SP10) ^5.

SP9

SP8

12

SPL

SP7

SP6

SP5

SP4

SP3

SP2

SP1

SP0

Reserved

SPMCSR

Reserved

MCUCR

MCUSR

SMCR

–

PGERS

–

SPMIE

(RWWSB)^5.

–

(RWWSRE)^5.

BLBSET

PGWRT

SELFPRGEN

294

–

PUD

–

IVCE

PORF

SE

BODS⁽⁶⁾

BODSE⁽⁶⁾

IVSEL

EXTRF

SM0

–

45/69/93

55

–

WDRF

SM2

–

BORF

SM1

–

40

Reserved

ACSR

–

ACBG

–

ACD

–

ACO

–

ACI

–

ACIE

–

ACIC

–

ACIS1

–

ACIS0

–

248

Reserved

SPDR

SPI Data Register

176

175

174

25

SPSR

SPIF

SPIE

WCOL

SPE

–

SPI2X

SPR0

SPCR

DORD

MSTR

CPOL

CPHA

SPR1

GPIOR2

GPIOR1

Reserved

OCR0B

OCR0A

TCNT0

General Purpose I/O Register 2

General Purpose I/O Register 1

25

–

Timer/Counter0 Output Compare Register B

Timer/Counter0 Output Compare Register A

Timer/Counter0 (8-bit)

TCCR0B

TCCR0A

GTCCR

EEARH

EEARL

FOC0A

COM0A1

TSM

FOC0B

COM0A0

–

COM0B1

–

COM0B0

–

WGM02

CS02

CS01

CS00

–

WGM01

PSRASY

WGM00

PSRSYNC

144/166

21

(EEPROM Address Register High Byte) ^5.

EEPROM Address Register Low Byte

EEPROM Data Register

21

EEDR

21

EECR

–

EEPM1

EEPM0

EERIE

EEMPE

EEPE

EERE

21

GPIOR0

General Purpose I/O Register 0

25

10

8271BS–AVR–04/10

ATmega48A/48PA/88A/88PA/168A/168PA/328/328P

Address

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Page

0x1D (0x3D)

0x1C (0x3C)

0x1B (0x3B)

0x1A (0x3A)

0x19 (0x39)

0x18 (0x38)

0x17 (0x37)

0x16 (0x36)

0x15 (0x35)

0x14 (0x34)

0x13 (0x33)

0x12 (0x32)

0x11 (0x31)

0x10 (0x30)

0x0F (0x2F)

0x0E (0x2E)

0x0D (0x2D)

0x0C (0x2C)

0x0B (0x2B)

0x0A (0x2A)

0x09 (0x29)

0x08 (0x28)

0x07 (0x27)

0x06 (0x26)

0x05 (0x25)

0x04 (0x24)

0x03 (0x23)

0x02 (0x22)

0x01 (0x21)

0x0 (0x20)

EIMSK

EIFR

–

INT1

INT0

73

–

INTF1

INTF0

PCIFR

–

PCIF2

PCIF1

PCIF0

Reserved

TIFR2

–

OCF2B

OCF2A

TOV2

164

140

TIFR1

–

ICF1

–

OCF1B

OCF1A

TOV1

TIFR0

–

OCF0B

OCF0A

TOV0

Reserved

PORTD

DDRD

–

PORTD7

PORTD6

DDD6

PIND6

PORTC6

DDC6

PINC6

PORTB6

DDB6

PINB6

–

PORTD5

DDD5

PIND5

PORTC5

DDC5

PINC5

PORTB5

DDB5

PINB5

–

PORTD4

DDD4

PIND4

PORTC4

DDC4

PINC4

PORTB4

DDB4

PINB4

–

PORTD3

DDD3

PIND3

PORTC3

DDC3

PINC3

PORTB3

DDB3

PINB3

–

PORTD2

DDD2

PIND2

PORTC2

DDC2

PINC2

PORTB2

DDB2

PINB2

–

PORTD1

DDD1

PIND1

PORTC1

DDC1

PINC1

PORTB1

DDB1

PINB1

–

PORTD0

DDD0

PIND0

PORTC0

DDC0

PINC0

PORTB0

DDB0

PINB0

–

94

93

DDD7

PIND

PIND7

PORTC

DDRC

–

PINC

–

PORTB

DDRB

PORTB7

DDB7

PINB

PINB7

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

ATmega48A/48PA/88A/88PA/168A/168PA/328/328P 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 ATmega88A/88PA/168A/168PA/328/328P.

6. BODS and BODSE only available for picoPower devices ATmega48PA/88PA/168PA/328P

11

8271BS–AVR–04/10

ATmega48A/48PA/88A/88PA/168A/168PA/328/328P

5. Instruction Set Summary

Mnemonics

Operands

Description

Operation

Flags

#Clocks

ARITHMETIC AND LOGIC INSTRUCTIONS

ADD

Rd, Rr

Rdl,K

Rd, Rr

Rd, K

Rd, Rr

Rd, K

Rdl,K

Rd, Rr

Rd, K

Rd, Rr

Rd, K

Rd, Rr

Rd

Add two Registers

Rd ← Rd + Rr

Z,C,N,V,H

Z,C,N,V,S

Z,C,N,V,H

Z,C,N,V,S

Z,N,V

1

2

1

2

1

2

ADC

Add with Carry two Registers

Add Immediate to Word

Subtract two Registers

Subtract Constant from Register

Subtract with Carry two Registers

Subtract with Carry Constant from Reg.

Subtract Immediate from Word

Logical AND Registers

Logical AND Register and Constant

Logical OR Registers

Rd ← Rd + Rr + C

Rdh:Rdl ← Rdh:Rdl + K

Rd ← Rd - Rr

ADIW

SUB

SUBI

SBC

Rd ← Rd - K

Rd ← Rd - Rr - C

Rd ← Rd - K - C

Rdh:Rdl ← Rdh:Rdl - K

Rd ← Rd • Rr

SBCI

SBIW

AND

ANDI

OR

Rd ← Rd • K

Z,N,V

Rd ← Rd v Rr

Z,N,V

ORI

Logical OR Register and Constant

Exclusive OR Registers

One’s Complement

Rd ← Rd v K

Z,N,V

EOR

COM

NEG

SBR

Rd ← Rd ⊕ Rr

Z,N,V

Rd ← 0xFF − Rd

Rd ← 0x00 − Rd

Rd ← Rd v K

Z,C,N,V

Z,C,N,V,H

Z,N,V

Rd

Two’s Complement

Rd,K

Rd

Set Bit(s) in Register

CBR

Clear Bit(s) in Register

Increment

Rd ← Rd • (0xFF - K)

Rd ← Rd + 1

Z,N,V

INC

Z,N,V

DEC

Rd

Decrement

Rd ← Rd − 1

Z,N,V

TST

Rd

Test for Zero or Minus

Clear Register

Rd ← Rd • Rd

Z,N,V

CLR

Rd

Rd ← Rd ⊕ Rd

Rd ← 0xFF

Z,N,V

SER

Rd

Set Register

None

MUL

Rd, Rr

Multiply Unsigned

R1:R0 ← Rd x Rr

R1:R0 ← (Rd x Rr) << 1

Z,C

MULS

MULSU

FMUL

FMULS

FMULSU

Multiply Signed

Z,C

Multiply Signed with Unsigned

Fractional Multiply Unsigned

Fractional Multiply Signed

Fractional Multiply Signed with Unsigned

Z,C

BRANCH INSTRUCTIONS

RJMP

k

Relative Jump

PC ← PC + k + 1

None

I

2

IJMP

Indirect Jump to (Z)

PC ← Z

JMP⁽¹⁾

RCALL

ICALL

CALL⁽¹⁾

RET

k

Direct Jump

PC ← k

3

Relative Subroutine Call

Indirect Call to (Z)

PC ← PC + k + 1

3

PC ← Z

3

k

Direct Subroutine Call

Subroutine Return

PC ← k

4

PC ← STACK

4

RETI

Interrupt Return

PC ← STACK

4

CPSE

CP

Rd,Rr

Compare, Skip if Equal

Compare

if (Rd = Rr) PC ← PC + 2 or 3

Rd − Rr

None

Z, N,V,C,H

None

1/2/3

1

Rd,Rr

CPC

Rd,Rr

Compare with Carry

Rd − Rr − C

1

CPI

Rd,K

Compare Register with Immediate

Skip if Bit in Register Cleared

Skip if Bit in Register is Set

Skip if Bit in I/O Register Cleared

Skip if Bit in I/O Register is Set

Branch if Status Flag Set

Branch if Status Flag Cleared

Branch if Equal

Rd − K

1

SBRC

SBRS

SBIC

Rr, b

if (Rr(b)=0) PC ← PC + 2 or 3

if (Rr(b)=1) PC ← PC + 2 or 3

if (P(b)=0) PC ← PC + 2 or 3

if (P(b)=1) PC ← PC + 2 or 3

if (SREG(s) = 1) then PC←PC+k + 1

if (SREG(s) = 0) then PC←PC+k + 1

if (Z = 1) then PC ← PC + k + 1

if (Z = 0) then PC ← PC + k + 1

if (C = 1) then PC ← PC + k + 1

if (C = 0) then PC ← PC + k + 1

if (C = 1) then PC ← PC + k + 1

if (N = 1) then PC ← PC + k + 1

if (N = 0) then PC ← PC + k + 1

if (N ⊕ V= 0) then PC ← PC + k + 1

if (N ⊕ V= 1) then PC ← PC + k + 1

if (H = 1) then PC ← PC + k + 1

if (H = 0) then PC ← PC + k + 1

if (T = 1) then PC ← PC + k + 1

if (T = 0) then PC ← PC + k + 1

if (V = 1) then PC ← PC + k + 1

if (V = 0) then PC ← PC + k + 1

1/2/3

1/2

Rr, b

P, b

s, k

k

SBIS

BRBS

BRBC

BREQ

BRNE

BRCS

BRCC

BRSH

BRLO

BRMI

BRPL

BRGE

BRLT

BRHS

BRHC

BRTS

BRTC

BRVS

BRVC

k

Branch if Not Equal

k

Branch if Carry Set

k

Branch if Carry Cleared

Branch if Same or Higher

Branch if Lower

k

Branch if Minus

k

Branch if Plus

k

Branch if Greater or Equal, Signed

Branch if Less Than Zero, Signed

Branch if Half Carry Flag Set

Branch if Half Carry Flag Cleared

Branch if T Flag Set

k

Branch if T Flag Cleared

Branch if Overflow Flag is Set

Branch if Overflow Flag is Cleared

k

12

8271BS–AVR–04/10

ATmega48A/48PA/88A/88PA/168A/168PA/328/328P

Mnemonics

Operands

Description

Operation

Flags

#Clocks

BRIE

BRID

k

Branch if Interrupt Enabled

if ( I = 1) then PC ← PC + k + 1

if ( I = 0) then PC ← PC + k + 1

None

1/2

Branch if Interrupt Disabled

None

BIT AND BIT-TEST INSTRUCTIONS

SBI

P,b

Rd

s

Set Bit in I/O Register

Clear Bit in I/O Register

Logical Shift Left

I/O(P,b) ← 1

None

2

1

CBI

I/O(P,b) ← 0

None

LSL

Rd(n+1) ← Rd(n), Rd(0) ← 0

Z,C,N,V

LSR

ROL

ROR

ASR

SWAP

BSET

BCLR

BST

BLD

SEC

CLC

SEN

CLN

SEZ

CLZ

SEI

Logical Shift Right

Rd(n) ← Rd(n+1), Rd(7) ← 0

Z,C,N,V

Rotate Left Through Carry

Rotate Right Through Carry

Arithmetic Shift Right

Swap Nibbles

Rd(0)←C,Rd(n+1)← Rd(n),C←Rd(7)

Z,C,N,V

Rd(7)←C,Rd(n)← Rd(n+1),C←Rd(0)

Z,C,N,V

Rd(n) ← Rd(n+1), n=0...6

Z,C,N,V

Rd(3...0)←Rd(7...4),Rd(7...4)←Rd(3...0)

None

Flag Set

SREG(s) ← 1

SREG(s) ← 0

T ← Rr(b)

Rd(b) ← T

C ← 1

SREG(s)

s

Flag Clear

SREG(s)

Rr, b

Rd, b

Bit Store from Register to T

Bit load from T to Register

Set Carry

T

None

C

N

Z

Clear Carry

C ← 0

Set Negative Flag

N ← 1

Clear Negative Flag

Set Zero Flag

N ← 0

Z ← 1

Clear Zero Flag

Z ← 0

Z

Global Interrupt Enable

Global Interrupt Disable

Set Signed Test Flag

Clear Signed Test Flag

Set Twos Complement Overflow.

Clear Twos Complement Overflow

Set T in SREG

I ← 1

I

CLI

I ← 0

I

SES

CLS

SEV

CLV

SET

CLT

SEH

CLH

S ← 1

S

V

T

S ← 0

V ← 1

V ← 0

T ← 1

Clear T in SREG

T ← 0

T

Set Half Carry Flag in SREG

Clear Half Carry Flag in SREG

H ← 1

H

H ← 0

DATA TRANSFER INSTRUCTIONS

MOV

MOVW

LDI

LD

Rd, Rr

Rd, K

Move Between Registers

Copy Register Word

Rd ← Rr

None

1

2

3

-

Rd+1:Rd ← Rr+1:Rr

Load Immediate

Rd ← K

Rd, X

Load Indirect

Rd ← (X)

LD

Rd, X+

Rd, - X

Rd, Y

Load Indirect and Post-Inc.

Load Indirect and Pre-Dec.

Load Indirect

Rd ← (X), X ← X + 1

X ← X - 1, Rd ← (X)

Rd ← (Y)

LD

Rd, Y+

Rd, - Y

Rd,Y+q

Rd, Z

Load Indirect and Post-Inc.

Load Indirect and Pre-Dec.

Load Indirect with Displacement

Load Indirect

Rd ← (Y), Y ← Y + 1

Y ← Y - 1, Rd ← (Y)

Rd ← (Y + q)

Rd ← (Z)

LD

LDD

LD

Rd, Z+

Rd, -Z

Rd, Z+q

Rd, k

Load Indirect and Post-Inc.

Load Indirect and Pre-Dec.

Load Indirect with Displacement

Load Direct from SRAM

Store Indirect

Rd ← (Z), Z ← Z+1

Z ← Z - 1, Rd ← (Z)

Rd ← (Z + q)

Rd ← (k)

LD

LDD

LDS

ST

X, Rr

(X) ← Rr

ST

X+, Rr

- X, Rr

Y, Rr

Store Indirect and Post-Inc.

Store Indirect and Pre-Dec.

Store Indirect

(X) ← Rr, X ← X + 1

X ← X - 1, (X) ← Rr

(Y) ← Rr

ST

Y+, Rr

- Y, Rr

Y+q,Rr

Z, Rr

Store Indirect and Post-Inc.

Store Indirect and Pre-Dec.

Store Indirect with Displacement

Store Indirect

(Y) ← Rr, Y ← Y + 1

Y ← Y - 1, (Y) ← Rr

(Y + q) ← Rr

ST

STD

ST

(Z) ← Rr

ST

Z+, Rr

-Z, Rr

Z+q,Rr

k, Rr

Store Indirect and Post-Inc.

Store Indirect and Pre-Dec.

Store Indirect with Displacement

Store Direct to SRAM

Load Program Memory

Load Program Memory and Post-Inc

Store Program Memory

In Port

(Z) ← Rr, Z ← Z + 1

Z ← Z - 1, (Z) ← Rr

(Z + q) ← Rr

ST

STD

STS

LPM

SPM

IN

(k) ← Rr

R0 ← (Z)

Rd, Z

Rd ← (Z)

Rd, Z+

Rd ← (Z), Z ← Z+1

(Z) ← R1:R0

Rd, P

P, Rr

Rr

Rd ← P

1

2

OUT

PUSH

Out Port

P ← Rr

Push Register on Stack

STACK ← Rr

13

8271BS–AVR–04/10

ATmega48A/48PA/88A/88PA/168A/168PA/328/328P

Mnemonics

Operands

Description

Operation

Flags

#Clocks

POP

Rd

Pop Register from Stack

Rd ← STACK

None

2

MCU CONTROL INSTRUCTIONS

NOP

No Operation

Sleep

None

1

SLEEP

WDR

(see specific descr. for Sleep function)

(see specific descr. for WDR/timer)

For On-chip Debug Only

Watchdog Reset

Break

1

BREAK

N/A

Note:

1. These instructions are only available in ATmega168PA and ATmega328P.

14

8271BS–AVR–04/10

ATmega48A/48PA/88A/88PA/168A/168PA/328/328P

6. Ordering Information

6.1

ATmega48A

Speed (MHz)

Power Supply

Ordering Code⁽²⁾

Package⁽¹⁾

Operational Range

ATmega48A-AU

32A

ATmega48A-AUR⁽⁵⁾

ATmega48A-MMH⁽⁴⁾

ATmega48A-MMHR⁽⁴⁾⁽⁵⁾

ATmega48A-MU

28M1

32M1-A

28P3

Industrial

(-40°C to 85°C)

20⁽³⁾

1.8 - 5.5

ATmega48A-MUR⁽⁵⁾

ATmega48A-PU

Note:

1. This device can also be supplied in wafer form. Please contact your local Atmel sales office for detailed ordering information

and minimum quantities.

2. Pb-free packaging complies to the European Directive for Restriction of Hazardous Substances (RoHS directive).Also

Halide free and fully Green.

3. See ”Speed Grades” on page 321.

4. NiPdAu Lead Finish.

5. Tape & Reel.

Package Type

32A

32-lead, Thin (1.0 mm) Plastic Quad Flat Package (TQFP)

28M1

28-pad, 4 x 4 x 1.0 body, Lead Pitch 0.45 mm Quad Flat No-Lead/Micro Lead Frame Package (QFN/MLF)

32M1-A

28P3

32-pad, 5 x 5 x 1.0 body, Lead Pitch 0.50 mm Quad Flat No-Lead/Micro Lead Frame Package (QFN/MLF)

28-lead, 0.300” Wide, Plastic Dual Inline Package (PDIP)

15

8271BS–AVR–04/10

ATmega48A/48PA/88A/88PA/168A/168PA/328/328P

6.2

ATmega48PA

Speed (MHz)

Power Supply

Ordering Code⁽²⁾

Package⁽¹⁾

Operational Range

ATmega48PA-AU

32A

ATmega48PA-AUR⁽⁵⁾

ATmega48PA-MMH⁽⁴⁾

ATmega48PA-MMHR⁽⁴⁾⁽⁵⁾

ATmega48PA-MU

28M1

32M1-A

28P3

Industrial

(-40°C to 85°C)

20⁽³⁾

1.8 - 5.5

ATmega48PA-MUR⁽⁵⁾

ATmega48PA-PU

Note:

1. This device can also be supplied in wafer form. Please contact your local Atmel sales office for detailed ordering information

and minimum quantities.

2. Pb-free packaging complies to the European Directive for Restriction of Hazardous Substances (RoHS directive).Also

Halide free and fully Green.

3. See ”Speed Grades” on page 321.

4. NiPdAu Lead Finish.

5. Tape & Reel.

Package Type

32A

32-lead, Thin (1.0 mm) Plastic Quad Flat Package (TQFP)

28M1

28-pad, 4 x 4 x 1.0 body, Lead Pitch 0.45 mm Quad Flat No-Lead/Micro Lead Frame Package (QFN/MLF)

32M1-A

28P3

32-pad, 5 x 5 x 1.0 body, Lead Pitch 0.50 mm Quad Flat No-Lead/Micro Lead Frame Package (QFN/MLF)

28-lead, 0.300” Wide, Plastic Dual Inline Package (PDIP)

16

8271BS–AVR–04/10

ATmega48A/48PA/88A/88PA/168A/168PA/328/328P

6.3

ATmega88A

Speed (MHz)

Power Supply

Ordering Code⁽²⁾

Package⁽¹⁾

Operational Range

ATmega88A-AU

32A

ATmega88A-AUR⁽⁵⁾

ATmega88A-MMH⁽⁴⁾

ATmega88A-MMHR⁽⁴⁾⁽⁵⁾

ATmega88A-MU

28M1

32M1-A

28P3

Industrial

(-40°C to 85°C)

20⁽³⁾

1.8 - 5.5

ATmega88A-MUR⁽⁵⁾

ATmega88A-PU

Note:

1. This device can also be supplied in wafer form. Please contact your local Atmel sales office for detailed ordering information

and minimum quantities.

2. Pb-free packaging complies to the European Directive for Restriction of Hazardous Substances (RoHS directive).Also

Halide free and fully Green.

3. See ”Speed Grades” on page 321.

4. NiPdAu Lead Finish.

5. Tape & Reel.

Package Type

32A

32-lead, Thin (1.0 mm) Plastic Quad Flat Package (TQFP)

28M1

28-pad, 4 x 4 x 1.0 body, Lead Pitch 0.45 mm Quad Flat No-Lead/Micro Lead Frame Package (QFN/MLF)

32M1-A

28P3

32-pad, 5 x 5 x 1.0 body, Lead Pitch 0.50 mm Quad Flat No-Lead/Micro Lead Frame Package (QFN/MLF)

28-lead, 0.300” Wide, Plastic Dual Inline Package (PDIP)

17

8271BS–AVR–04/10

ATmega48A/48PA/88A/88PA/168A/168PA/328/328P

6.4

ATmega88PA

Speed (MHz)

Power Supply (V)

Ordering Code⁽²⁾

Package⁽¹⁾

Operational Range

ATmega88PA-AU

32A

ATmega88PA-AUR⁽⁵⁾

ATmega88PA-MMH⁽⁴⁾

ATmega88PA-MMHR⁽⁴⁾⁽⁵⁾

ATmega88PA-MU

28M1

32M1-A

28P3

Industrial

(-40°C to 85°C)

20⁽³⁾

1.8 - 5.5

ATmega88PA-MUR⁽⁵⁾

ATmega88PA-PU

Note:

1. This device can also be supplied in wafer form. Please contact your local Atmel sales office for detailed ordering information

and minimum quantities.

2. Pb-free packaging complies to the European Directive for Restriction of Hazardous Substances (RoHS directive).Also

Halide free and fully Green.

3. See ”Speed Grades” on page 321.

4. NiPdAu Lead Finish.

5. Tape & Reel.

Package Type

32A

32-lead, Thin (1.0 mm) Plastic Quad Flat Package (TQFP)

28M1

28-pad, 4 x 4 x 1.0 body, Lead Pitch 0.45 mm Quad Flat No-Lead/Micro Lead Frame Package (QFN/MLF)

32M1-A

28P3

32-pad, 5 x 5 x 1.0 body, Lead Pitch 0.50 mm Quad Flat No-Lead/Micro Lead Frame Package (QFN/MLF)

28-lead, 0.300” Wide, Plastic Dual Inline Package (PDIP)

18

8271BS–AVR–04/10

ATmega48A/48PA/88A/88PA/168A/168PA/328/328P

6.5

ATmega168A

Speed (MHz)⁽³⁾

Power Supply (V)

Ordering Code⁽²⁾

Package⁽¹⁾

Operational Range

ATmega168A-AU

32A

ATmega168A-AUR⁽⁵⁾

ATmega168A-MMH⁽⁴⁾

ATmega168A-MMHR⁽⁴⁾⁽⁵⁾

ATmega168A-MU

28M1

32M1-A

28P3

Industrial

(-40°C to 85°C)

20

1.8 - 5.5

ATmega168A-MUR⁽⁵⁾

ATmega168A-PU

Note:

1. This device can also be supplied in wafer form. Please contact your local Atmel sales office for detailed ordering information

and minimum quantities.

2. Pb-free packaging complies to the European Directive for Restriction of Hazardous Substances (RoHS directive).Also

Halide free and fully Green.

3. See ”Speed Grades” on page 321

4. NiPdAu Lead Finish.

5. Tape & Reel.

Package Type

32A

32-lead, Thin (1.0 mm) Plastic Quad Flat Package (TQFP)

28M1

28-pad, 4 x 4 x 1.0 body, Lead Pitch 0.45 mm Quad Flat No-Lead/Micro Lead Frame Package (QFN/MLF)

32M1-A

28P3

32-pad, 5 x 5 x 1.0 body, Lead Pitch 0.50 mm Quad Flat No-Lead/Micro Lead Frame Package (QFN/MLF)

28-lead, 0.300” Wide, Plastic Dual Inline Package (PDIP)

19

8271BS–AVR–04/10

ATmega48A/48PA/88A/88PA/168A/168PA/328/328P

6.6

ATmega168PA

Speed (MHz)⁽³⁾

Power Supply (V)

Ordering Code⁽²⁾

Package⁽¹⁾

Operational Range

ATmega168PA-AU

32A

ATmega168PA-AUR⁽⁵⁾

ATmega168PA-MMH⁽⁴⁾

ATmega168PA-MMHR⁽⁴⁾⁽⁵⁾

ATmega168PA-MU

28M1

32M1-A

28P3

Industrial

(-40°C to 85°C)

20

1.8 - 5.5

ATmega168PA-MUR⁽⁵⁾

ATmega168PA-PU

Note:

1. This device can also be supplied in wafer form. Please contact your local Atmel sales office for detailed ordering information

and minimum quantities.

2. Pb-free packaging complies to the European Directive for Restriction of Hazardous Substances (RoHS directive).Also

Halide free and fully Green.

3. See ”Speed Grades” on page 321.

4. NiPdAu Lead Finish.

5. Tape & Reel.

Package Type

32A

32-lead, Thin (1.0 mm) Plastic Quad Flat Package (TQFP)

28M1

28-pad, 4 x 4 x 1.0 body, Lead Pitch 0.45 mm Quad Flat No-Lead/Micro Lead Frame Package (QFN/MLF)

32M1-A

28P3

32-pad, 5 x 5 x 1.0 body, Lead Pitch 0.50 mm Quad Flat No-Lead/Micro Lead Frame Package (QFN/MLF)

28-lead, 0.300” Wide, Plastic Dual Inline Package (PDIP)

20

8271BS–AVR–04/10

ATmega48A/48PA/88A/88PA/168A/168PA/328/328P

6.7

ATmega328

Speed (MHz)

Power Supply (V)

Ordering Code⁽²⁾

Package⁽¹⁾

Operational Range

ATmega328-AU

32A

32M1-A

28P3

ATmega328-AUR⁽⁴⁾

ATmega328-MU

ATmega328-MUR⁽⁴⁾

ATmega328-PU

Industrial

(-40°C to 85°C)

20⁽³⁾

1.8 - 5.5

Note:

1. This device can also be supplied in wafer form. Please contact your local Atmel sales office for detailed ordering information

and minimum quantities.

2. Pb-free packaging complies to the European Directive for Restriction of Hazardous Substances (RoHS directive).Also

Halide free and fully Green.

3. See Figure 28-1 on page 321.

4. Tape & Reel

Package Type

32-lead, Thin (1.0 mm) Plastic Quad Flat Package (TQFP)

28-lead, 0.300” Wide, Plastic Dual Inline Package (PDIP)

32A

28P3

32M1-A

32-pad, 5 x 5 x 1.0 body, Lead Pitch 0.50 mm Quad Flat No-Lead/Micro Lead Frame Package (QFN/MLF)

21

8271BS–AVR–04/10

ATmega48A/48PA/88A/88PA/168A/168PA/328/328P

6.8

ATmega328P

Speed (MHz)

Power Supply

Ordering Code⁽²⁾

Package⁽¹⁾

Operational Range

ATmega328P-AU

ATmega328P-AUR⁽⁴⁾

ATmega328P-MU

ATmega328P-MUR⁽⁴⁾

ATmega328P-PU

32A

32M1-A

28P3

Industrial

(-40°C to 85°C)

20⁽³⁾

1.8 - 5.5

Note:

1. This device can also be supplied in wafer form. Please contact your local Atmel sales office for detailed ordering information

and minimum quantities.

2. Pb-free packaging complies to the European Directive for Restriction of Hazardous Substances (RoHS directive).Also

Halide free and fully Green.

3. See Figure 28-1 on page 321.

4. Tape & Reel.

Package Type

32-lead, Thin (1.0 mm) Plastic Quad Flat Package (TQFP)

28-lead, 0.300” Wide, Plastic Dual Inline Package (PDIP)

32A

28P3

32M1-A

32-pad, 5 x 5 x 1.0 body, Lead Pitch 0.50 mm Quad Flat No-Lead/Micro Lead Frame Package (QFN/MLF)

22

8271BS–AVR–04/10

ATmega48A/48PA/88A/88PA/168A/168PA/328/328P

7. Packaging Information

7.1

32A

PIN 1

B

PIN 1 IDENTIFIER

E1

E

e

D1

D

C

0˚~7˚

A2

A

A1

L

COMMON DIMENSIONS

(Unit of Measure = mm)

MIN

–

MAX

1.20

0.15

1.05

9.25

7.10

9.25

7.10

0.45

0.20

0.75

NOM

NOTE

SYMBOL

A

–

A1

A2

D

0.05

0.95

8.75

6.90

8.75

6.90

0.30

0.09

0.45

1.00

9.00

7.00

9.00

7.00

–

D1

E

Note 2

Notes:

1. This package conforms to JEDEC reference MS-026, Variation ABA.

2. Dimensions D1 and E1 do not include mold protrusion. Allowable

protrusion is 0.25 mm per side. Dimensions D1 and E1 are maximum

plastic body size dimensions including mold mismatch.

E1

B

C

–

3. Lead coplanarity is 0.10 mm maximum.

L

–

e

0.80 TYP

10/5/2001

TITLE

DRAWING NO. REV.

2325 Orchard Parkway

San Jose, CA 95131

32A, 32-lead, 7 x 7 mm Body Size, 1.0 mm Body Thickness,

0.8 mm Lead Pitch, Thin Profile Plastic Quad Flat Package (TQFP)

32A

B

R

23

8271BS–AVR–04/10

ATmega48A/48PA/88A/88PA/168A/168PA/328/328P

7.2

28M1

D

C

1

2

3

Pin 1 ID

E

SIDE VIEW

A1

TOP VIEW

A

y

K

D2

0.45

E2

COMMON DIMENSIONS

(Unit of Measure = mm)

1

2

3

R 0.20

MIN

MAX

NOM

NOTE

SYMBOL

A

0.80

0.90

1.00

A1

b

0.00

0.17

0.02

0.22

0.20 REF

4.00

2.40

4.00

2.40

0.45

0.40

–

0.05

0.27

b

C

D

D2

E

3.95

2.35

3.95

2.35

4.05

2.45

4.05

2.45

L

e

E2

e

0.4 Ref

(4x)

BOTTOM VIEW

L

0.35

0.00

0.20

0.45

0.08

–

y

K

–

The terminal #1 ID is a Laser-marked Feature.

Note:

10/24/08

GPC

DRAWING NO.

TITLE

REV.

28M1, 28-pad,4 x 4 x 1.0 mm Body, Lead Pitch 0.45 mm,

2.4 x 2.4 mm Exposed Pad, Thermally Enhanced

Plastic Very Thin Quad Flat No Lead Package (VQFN)

Package Drawing Contact:

packagedrawings@atmel.com

ZBV

28M1

B

24

8271BS–AVR–04/10

ATmega48A/48PA/88A/88PA/168A/168PA/328/328P

7.3

32M1-A

D

D1

1

2

3

0

Pin 1 ID

SIDE VIEW

E1

E

TOP VIEW

A3

A1

A2

A

K

COMMON DIMENSIONS

0.08

C

(Unit of Measure = mm)

P

D2

MIN

0.80

–

MAX

1.00

0.05

1.00

NOM

0.90

0.02

0.65

0.20 REF

0.23

5.00

4.75

3.10

5.00

4.75

3.10

0.50 BSC

0.40

–

NOTE

SYMBOL

A

A1

A2

A3

b

1

2

3

P

–

Pin #1 Notch

(0.20 R)

E2

0.18

4.90

4.70

2.95

4.90

4.70

2.95

0.30

5.10

4.80

3.25

5.10

4.80

3.25

D

K

D1

D2

E

e

b

L

E1

E2

e

BOTTOM VIEW

L

0.30

–

0.50

0.60

P

o

–

12

0

Note: JEDEC Standard MO-220, Fig. 2 (Anvil Singulation), VHHD-2.

K

0.20

–

5/25/06

DRAWING NO. REV.

32M1-A

TITLE

2325 Orchard Parkway

San Jose, CA 95131

32M1-A, 32-pad, 5 x 5 x 1.0 mm Body, Lead Pitch 0.50 mm,

3.10 mm Exposed Pad, Micro Lead Frame Package (MLF)

E

R

25

8271BS–AVR–04/10

ATmega48A/48PA/88A/88PA/168A/168PA/328/328P

7.4

28P3

D

1

E1

A

SEATING PLANE

A1

B2

(4 PLACES)

L

B

B1

e

E

COMMON DIMENSIONS

(Unit of Measure = mm)

0º ~ 15º REF

C

MIN

–

MAX

4.5724

–

NOM

NOTE

SYMBOL

A

–

eB

A1

D

0.508

34.544

7.620

7.112

0.381

1.143

0.762

3.175

0.203

–

34.798 Note 1

8.255

E

E1

B

7.493 Note 1

0.533

B1

B2

L

1.397

Note:

1. Dimensions D and E1 do not include mold Flash or Protrusion.

Mold Flash or Protrusion shall not exceed 0.25 mm (0.010").

1.143

3.429

C

0.356

eB

e

10.160

2.540 TYP

09/28/01

DRAWING NO. REV.

28P3

TITLE

2325 Orchard Parkway

San Jose, CA 95131

28P3, 28-lead (0.300"/7.62 mm Wide) Plastic Dual

Inline Package (PDIP)

B

R

26

8271BS–AVR–04/10

ATmega48A/48PA/88A/88PA/168A/168PA/328/328P

8. Errata

8.1

Errata ATmega48A

The revision letter in this section refers to the revision of the ATmega48A device.

8.1.1

Rev. D

• Analog MUX can be turned off when setting ACME bit

1. Analog MUX can be turned off when setting ACME bit

If the ACME (Analog Comparator Multiplexer Enabled) bit in ADCSRB is set while MUX3 in

ADMUX is '1' (ADMUX[3:0]=1xxx), all MUX'es are turned off until the ACME bit is cleared.

Problem Fix/Workaround

Clear the MUX3 bit before setting the ACME bit.

8.2

Errata ATmega48PA

The revision letter in this section refers to the revision of the ATmega48PA device.

8.2.1

Rev. D

• Analog MUX can be turned off when setting ACME bit

1. Analog MUX can be turned off when setting ACME bit

If the ACME (Analog Comparator Multiplexer Enabled) bit in ADCSRB is set while MUX3 in

ADMUX is '1' (ADMUX[3:0]=1xxx), all MUX'es are turned off until the ACME bit is cleared.

Problem Fix/Workaround

Clear the MUX3 bit before setting the ACME bit.

8.3

Errata ATmega88A

The revision letter in this section refers to the revision of the ATmega88A device.

8.3.1

Rev. F

• Analog MUX can be turned off when setting ACME bit

1. Analog MUX can be turned off when setting ACME bit

If the ACME (Analog Comparator Multiplexer Enabled) bit in ADCSRB is set while MUX3 in

ADMUX is '1' (ADMUX[3:0]=1xxx), all MUX'es are turned off until the ACME bit is cleared.

Problem Fix/Workaround

Clear the MUX3 bit before setting the ACME bit.

27

8271BS–AVR–04/10

ATmega48A/48PA/88A/88PA/168A/168PA/328/328P

8.4

Errata ATmega88PA

The revision letter in this section refers to the revision of the ATmega88PA device.

8.4.1

Rev. F

• Analog MUX can be turned off when setting ACME bit

1. Analog MUX can be turned off when setting ACME bit

If the ACME (Analog Comparator Multiplexer Enabled) bit in ADCSRB is set while MUX3 in

ADMUX is '1' (ADMUX[3:0]=1xxx), all MUX'es are turned off until the ACME bit is cleared.

Problem Fix/Workaround

Clear the MUX3 bit before setting the ACME bit.

8.5

Errata ATmega168A

The revision letter in this section refers to the revision of the ATmega168A device.

8.5.1

Rev. E

• Analog MUX can be turned off when setting ACME bit

1. Analog MUX can be turned off when setting ACME bit

If the ACME (Analog Comparator Multiplexer Enabled) bit in ADCSRB is set while MUX3 in

ADMUX is '1' (ADMUX[3:0]=1xxx), all MUX'es are turned off until the ACME bit is cleared.

Problem Fix/Workaround

Clear the MUX3 bit before setting the ACME bit.

8.6

Errata ATmega168PA

The revision letter in this section refers to the revision of the ATmega168PA device.

8.6.1

Rev E

• Analog MUX can be turned off when setting ACME bit

1. Analog MUX can be turned off when setting ACME bit

If the ACME (Analog Comparator Multiplexer Enabled) bit in ADCSRB is set while MUX3 in

ADMUX is '1' (ADMUX[3:0]=1xxx), all MUX'es are turned off until the ACME bit is cleared.

Problem Fix/Workaround

Clear the MUX3 bit before setting the ACME bit.

28

8271BS–AVR–04/10

ATmega48A/48PA/88A/88PA/168A/168PA/328/328P

8.7

Errata ATmega328

The revision letter in this section refers to the revision of the ATmega328 device.

8.7.1

Rev D

• Analog MUX can be turned off when setting ACME bit

1. Analog MUX can be turned off when setting ACME bit

If the ACME (Analog Comparator Multiplexer Enabled) bit in ADCSRB is set while MUX3 in

ADMUX is '1' (ADMUX[3:0]=1xxx), all MUX'es are turned off until the ACME bit is cleared.

Problem Fix/Workaround

Clear the MUX3 bit before setting the ACME bit.

8.7.2

8.7.3

Rev C

Rev B

Not sampled.

• Analog MUX can be turned off when setting ACME bit

• Unstable 32 kHz Oscillator

1. Unstable 32 kHz Oscillator

If the ACME (Analog Comparator Multiplexer Enabled) bit in ADCSRB is set while MUX3 in

ADMUX is '1' (ADMUX[3:0]=1xxx), all MUX'es are turned off until the ACME bit is cleared.

Problem Fix/Workaround

Clear the MUX3 bit before setting the ACME bit.

2. Unstable 32 kHz Oscillator

The 32 kHz oscillator does not work as system clock. The 32 kHz oscillator used as asyn-

chronous timer is inaccurate.

Problem Fix/ Workaround

None.

8.7.4

Rev A

• Analog MUX can be turned off when setting ACME bit

• Unstable 32 kHz Oscillator

1. Unstable 32 kHz Oscillator

If the ACME (Analog Comparator Multiplexer Enabled) bit in ADCSRB is set while MUX3 in

ADMUX is '1' (ADMUX[3:0]=1xxx), all MUX'es are turned off until the ACME bit is cleared.

Problem Fix/Workaround

Clear the MUX3 bit before setting the ACME bit.

2. Unstable 32 kHz Oscillator

The 32 kHz oscillator does not work as system clock. The 32 kHz oscillator used as asyn-

chronous timer is inaccurate.

Problem Fix/ Workaround

None.

29

8271BS–AVR–04/10

ATmega48A/48PA/88A/88PA/168A/168PA/328/328P

8.8

Errata ATmega328P

The revision letter in this section refers to the revision of the ATmega328P device.

8.8.1

Rev D

• Analog MUX can be turned off when setting ACME bit

1. Analog MUX can be turned off when setting ACME bit

If the ACME (Analog Comparator Multiplexer Enabled) bit in ADCSRB is set while MUX3 in

ADMUX is '1' (ADMUX[3:0]=1xxx), all MUX'es are turned off until the ACME bit is cleared.

Problem Fix/Workaround

Clear the MUX3 bit before setting the ACME bit.

8.8.2

8.8.3

Rev C

Rev B

Not sampled.

• Analog MUX can be turned off when setting ACME bit

• Unstable 32 kHz Oscillator

1. Unstable 32 kHz Oscillator

If the ACME (Analog Comparator Multiplexer Enabled) bit in ADCSRB is set while MUX3 in

ADMUX is '1' (ADMUX[3:0]=1xxx), all MUX'es are turned off until the ACME bit is cleared.

Problem Fix/Workaround

Clear the MUX3 bit before setting the ACME bit.

2. Unstable 32 kHz Oscillator

The 32 kHz oscillator does not work as system clock. The 32 kHz oscillator used as asyn-

chronous timer is inaccurate.

Problem Fix/ Workaround

None.

8.8.4

Rev A

• Unstable 32 kHz Oscillator

1. Unstable 32 kHz Oscillator

The 32 kHz oscillator does not work as system clock. The 32 kHz oscillator used as asyn-

chronous timer is inaccurate.

Problem Fix/ Workaround

None.

30

8271BS–AVR–04/10

ATmega48A/48PA/88A/88PA/168A/168PA/328/328P

9. Datasheet Revision History

Please note that the referring page numbers in this section are referred to this document. The

referring revision in this section are referring to the document revision.

9.1

Rev. 8271B-04/10

1.

Updated Table 8-8 with correct value for timer oscilliator at xtal2/tos2

Corrected use of SBIS instructions in assembly code examples.

2.

3.

Corrected BOD and BODSE bits to R/W in Section 9.11.2 on page 45, Section 11.5 on page 69

and Section 13.4 on page 93

4.

5.

Figures for bandgap characterization added, Figure 29-34 on page 349, Figure 29-81 on page

374, Figure 29-128 on page 399, Figure 29-175 on page 424, Figure 29-222 on page 449, Fig-

ure 29-269 on page 474, Figure 29-316 on page 499 and Figure 29-363 on page 523.

Updated ”Packaging Information” on page 546 by replacing 28M1 with a correct corresponding

package.

9.2

Rev. 8271A-12/09

1.

New datasheet 8271 with merged information for ATmega48PA, ATmega88PA,

ATmega168PA and ATmega48A, ATmega88A andATmega168A. Also included

information on ATmega328 and ATmega328P

2

Changes done:

– New devices added: ATmega48A/ATmega88A/ATmega168A and

ATmega328

– Updated Feature Description

– Updated Table 2-1 on page 6

– Added note for BOD Disable on page 40.

– Added note on BOD and BODSE in ”MCUCR – MCU Control Register” on

page 93 and ”Register Description” on page 294

– Added limitation informatin for the application ”Boot Loader Support –

Read-While-Write Self-Programming” on page 279

– Added limitiation information for ”Program And Data Memory Lock Bits” on

page 296

– Added specified DC characteristice per processor

– Added typical characteristics per processor

– Removed execption information in ”Address Match Unit” on page 223.

31

8271BS–AVR–04/10

Headquarters

International

Atmel Corporation

2325 Orchard Parkway

San Jose, CA 95131

USA

Tel: 1(408) 441-0311

Fax: 1(408) 487-2600

Atmel Asia

Atmel Europe

Le Krebs

Atmel Japan

9F, Tonetsu Shinkawa Bldg.

1-24-8 Shinkawa

Chuo-ku, Tokyo 104-0033

Japan

Tel: (81) 3-3523-3551

Fax: (81) 3-3523-7581

Unit 1-5 & 16, 19/F

BEA Tower, Millennium City 5

418 Kwun Tong Road

Kwun Tong, Kowloon

Hong Kong

8, Rue Jean-Pierre Timbaud

BP 309

78054 Saint-Quentin-en-

Yvelines Cedex

France

Tel: (852) 2245-6100

Fax: (852) 2722-1369

Tel: (33) 1-30-60-70-00

Fax: (33) 1-30-60-71-11

Product Contact

Web Site

Technical Support

Sales Contact

www.atmel.com

avr@atmel.com

www.atmel.com/contacts

Literature Requests

www.atmel.com/literature

Disclaimer: The information in this document is provided in connection with Atmel products. No license, express or implied, by estoppel or otherwise, to any

intellectual property right is granted by this document or in connection with the sale of Atmel products. EXCEPT AS SET FORTH IN ATMEL’S TERMS AND CONDI-

TIONS OF SALE LOCATED ON ATMEL’S WEB SITE, ATMEL ASSUMES NO LIABILITY WHATSOEVER AND DISCLAIMS ANY EXPRESS, IMPLIED OR STATUTORY

WARRANTY RELATING TO ITS PRODUCTS INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR

PURPOSE, OR NON-INFRINGEMENT. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT, CONSEQUENTIAL, PUNITIVE, SPECIAL OR INCIDEN-

TAL DAMAGES (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF PROFITS, BUSINESS INTERRUPTION, OR LOSS OF INFORMATION) ARISING OUT OF

THE USE OR INABILITY TO USE THIS DOCUMENT, EVEN IF ATMEL HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. Atmel makes no

representations or warranties with respect to the accuracy or completeness of the contents of this document and reserves the right to make changes to specifications

and product descriptions at any time without notice. Atmel does not make any commitment to update the information contained herein. Unless specifically provided

otherwise, Atmel products are not suitable for, and shall not be used in, automotive applications. Atmel’s products are not intended, authorized, or warranted for use

as components in applications intended to support or sustain life.

marks or trademarks of Atmel Corporation or its subsidiaries. Other terms and product names may be trademarks of others.

8271BS–AVR–04/10

型号:	ATMEGA328P-AU
生命周期：	Active
包装说明：	TQFP,
Reach Compliance Code：	compliant
HTS代码：	8542.31.00.01
风险等级：	5.67
Is Samacsys：	N
具有ADC：	YES
其他特性：	ALSO OPERATES AT 4 MHZ AT 1.8V MIN SUPPLY
地址总线宽度：
位大小：	8
最大时钟频率：	20 MHz
DAC 通道：	NO
DMA 通道：	NO
外部数据总线宽度：
JESD-30 代码：	S-PQFP-G32
长度：	7 mm
I/O 线路数量：	23
端子数量：	32
片上程序ROM宽度：	8
最高工作温度：	85 °C
最低工作温度：	-40 °C
PWM 通道：	YES
封装主体材料：	PLASTIC/EPOXY
封装代码：	TQFP
封装形状：	SQUARE
封装形式：	FLATPACK, THIN PROFILE
RAM（字节）：	2048
ROM（单词）：	32768
ROM可编程性：	FLASH
座面最大高度：	1.2 mm
速度：	20 MHz
最大供电电压：	5.5 V
最小供电电压：	4.5 V
标称供电电压：	5 V
表面贴装：	YES
技术：	CMOS
温度等级：	INDUSTRIAL
端子形式：	GULL WING
端子节距：	0.8 mm
端子位置：	QUAD
宽度：	7 mm
uPs/uCs/外围集成电路类型：	MICROCONTROLLER, RISC
Base Number Matches：	1

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