Features
• High-performance, Low-power Atmel
• Advanced RISC Architecture
– 131 Powerful Instructions – Most Single-clock Cycle Execution
– 32 x 8 General Purpose Working Registers
– Fully Static Operation
– Up to 20MIPS Throughput at 20MHz
– On-chip 2-cycle Multiplier
• High Endurance Non-volatile Memory segments
– 16/32/64/128KBytes of In-System Self-programmable Flash program memory
– 512/1K/2K/4KBytes EEPROM
– 1/2/4/16KBytes Internal SRAM
– Write/Erase Cycles: 10,000 Flash/ 100,000 EEPROM
– Data retention: 20 years at 85°C/ 100 years at 25°C
– Optional Boot Code Section with Independent Lock Bits
In-System Programming by On-chip Boot Program
True Read-While-Write Operation
– Programming Lock for Software Security
• QTouch
• JTAG (IEEE std. 1149.1 Compliant) Interface
• Peripheral Features
• Special Microcontroller Features
• I/O and Packages
• Operating Voltages
• Speed Grades
• Power Consumption at 1MHz, 1.8V, 25°C
®
library support
– Capacitive touch buttons, sliders and wheels
– QTouch and QMatrix acquisition
– Up to 64 sense channels
– Boundary-scan Capabilities According to the JTAG Standard
– Extensive On-chip Debug Support
– Programming of Flash, EEPROM, Fuses, and Lock Bits through the JTAG Interface
– Two 8-bit Timer/Counters with Separate Prescalers and Compare Modes
– One/two 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
Differential mode with selectable gain at 1x, 10x or 200x
– Byte-oriented Two-wire Serial Interface
– Two Programmable Serial USART
– Master/Slave SPI Serial Interface
– Programmable Watchdog Timer with Separate On-chip Oscillator
– On-chip Analog Comparator
– Interrupt and Wake-up on Pin Change
– Power-on Reset and Programmable Brown-out Detection
– Internal Calibrated RC Oscillator
– External and Internal Interrupt Sources
– Six Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down, Standby and
Extended Standby
– 32 Programmable I/O Lines
– 40-pin PDIP, 44-lead TQFP, 44-pad VQFN/QFN/MLF
– 44-pad DRQFN
– 49-ball VFBGA
– 1.8 - 5.5V
– 0 - 4MHz @ 1.8 - 5.5V
– 0 - 10MHz @ 2.7 - 5.5V
– 0 - 20MHz @ 4.5 - 5.5V
– Active: 0.4mA
– Power-down Mode: 0.1µA
– Power-save Mode: 0.6µA (Including 32kHz RTC)
®
AVR® 8-bit Microcontroller
(1)
8-bit Atmel
Microcontroller
with
16/32/64/128K
Bytes In-System
Programmable
Flash
ATmega164A
ATmega164PA
ATmega324A
ATmega324PA
ATmega644A
ATmega644PA
ATmega1284
ATmega1284P
Summary
Note: 1. See ”Data Retention” on page 9 for details.
8272CS–AVR–06/11
ATmega164A/PA/324A/PA/644A/PA/1284/P
1. Pin Configurations
1.1 Pinout - PDIP/TQFP/VQFN/QFN/MLF for ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P
Figure 1-1. Pinout
(PCINT8/XCK0/T0) PB0
(PCINT9/CLKO/T1) PB1
(PCINT10/INT2/AIN0) PB2
(PCINT11/OC0A/AIN1) PB3
(PCINT12/OC0B/SS) PB4
(PCINT13/ICP3/MOSI) PB5
(PCINT14/OC3A/MISO) PB6
(PCINT15/OC3B/SCK) PB7
RESET
VCC
GND
XTAL2
XTAL1
(PCINT24/RXD0/T3) PD0
(PCINT25/TXD0) PD1
(PCINT26/RXD1/INT0) PD2
(PCINT27/TXD1/INT1) PD3
(PCINT28/XCK1/OC1B) PD4
(PCINT29/OC1A) PD5
(PCINT30/OC2B/ICP) PD6
TQFP/QFN/MLF
PB4 (SS/OC0B/PCINT12)
PB3 (AIN1/OC0A/PCINT11)
PB2 (AIN0/INT2/PCINT10)
PB1 (T1/CLKO/PCINT9)
PB0 (XCK0/T0/PCINT8)
GND
VCC
PA0 (ADC0/PCINT0)
PA1 (ADC1/PCINT1)
PA0 (ADC0/PCINT0)
PA1 (ADC1/PCINT1)
PA2 (ADC2/PCINT2)
PA3 (ADC3/PCINT3)
PA4 (ADC4/PCINT4)
PA5 (ADC5/PCINT5)
PA6 (ADC6/PCINT6)
PA7 (ADC7/PCINT7)
AREF
GND
AVC C
PC7 (TOSC2/PCINT23)
PC6 (TOSC1/PCINT22)
PC5 (TDI/PCINT21)
PC4 (TDO/PCINT20)
PC3 (TMS/PCINT19)
PC2 (TCK/PCINT18)
PC1 (SDA/PCINT17)
PC0 (SCL/PCINT16)
PD7 (OC2A/PCINT31)
PA2 (ADC2/PCINT2)
PA3 (ADC3/PCINT3)
8272CS–AVR–06/11
(PCINT13/ICP3/MOSI) PB5
(PCINT14/OC3A/MISO) PB6
(PCINT15/OC3B/SCK) PB7
RESET
VCC
GND
XTAL2
XTAL1
(PCINT24/RXD0/T3) PD0
(PCINT25/TXD0) PD1
(PCINT26/RXD1/INT0) PD2
VCC
GND
(PCINT16/SCL) PC0
(PCINT29/OC1A) PD5
(PCINT31/OC2A) PD7
(PCINT30/OC2B/ICP) PD6
(PCINT27/TXD1/INT1) PD3
(PCINT28/XCK1/OC1B) PD4
(PCINT17/SDA) PC1
(PCINT18/TCK) PC2
PA4 (ADC4/PCINT4)
PA5 (ADC5/PCINT5)
PA6 (ADC6/PCINT6)
PA7 (ADC7/PCINT7)
AREF
GND
AVC C
PC7 (TOSC2/PCINT23)
PC6 (TOSC1/PCINT22)
PC5 (TDI/PCINT21)
PC4 (TDO/PCINT20)
(PCINT19/TMS) PC3
Note: The large center pad underneath the VQFN/QFN/MLF package should be soldered to ground on
the board to ensure good mechanical stability.
2
ATmega164A/PA/324A/PA/644A/PA/1284/P
Top view Bottom view
A1
B1
A2
B2
A3
B3
A4
B4
A5
B5
A6
A18
B15
A17
B14
A16
B13
A15
B12
A14
B11
A13
A12
B10
A11
B9
A10
B8A9 B7A8 B6
A7
A24
B20
A23
B19
A22
B18
A21
B17
A20
B16
A19
A18
B15
A17
B14
A16
B13
A15
B12
A14
B11
A13
A1
B1
A2
B2
A3
B3
A4
B4
A5
B5
A6
A19
B16
A20
B17
A21
B18
A22
B19
A23
B20
A24
1.2 Pinout - DRQFN for ATmega164A/164PA/324A/324PA
Figure 1-2. DRQFN - Pinout
Table 1-1. DRQFN - Pinout
A1 PB5 A7 PD3 A13 PC4 A19 PA 3
B1 PB6 B6 PD4 B11 PC5 B16 PA 2
A2 PB7 A8 PD5 A14 PC6 A20 PA 1
B2 RESET
A3 VCC A9 PD7 A15 AVC C A21 VCC
B3 GND B8 VCC B13 GND B18 GND
A4 XTAL2 A10 GND A16 AREF A22 PB0
B4 XTAL1 B9 PC0 B14 PA 7 B19 PB1
A5 PD0 A11 PC1 A17 PA 6 A23 PB2
B5 PD1 B10 PC2 B15 PA 5 B20 PB3
8272CS–AVR–06/11
A6 PD2 A12 PC3 A18 PA 4 A24 PB4
B7 PD6 B12 PC7 B17 PA 0
3
ATmega164A/PA/324A/PA/644A/PA/1284/P
A
B
C
D
E
F
G
1 234567
A
B
C
D
E
F
G
7654321
Top view Bottom view
1.3 Pinout - VFBGA for ATmega164A/164PA/324A/324PA
Figure 1-3. VFBGA - Pinout
Table 1-2. BGA - Pinout
1234567
A GND PB4 PB2 GND VCC PA2 GND
B PB6 PB5 PB3 PB0 PA0 PA3 PA5
C VCC RESET PB7 PB1 PA1 PA6 AREF
D GND XTAL2 PD0 GND PA4 PA7 GND
E XTAL1 PD1 PD5 PD7 PC5 PC7 AVCC
F PD2 PD3 PD6 PC0 PC2 PC4 PC6
G GND PD4 VCC GND PC1 PC3 GND
8272CS–AVR–06/11
4
2. Overview
The ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P is a low-power CMOS 8-bit
microcontroller based on the AVR enhanced RISC architecture. By executing powerful instructions in a single clock cycle, the ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P
achieves throughputs 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
VCC
Powe r
RESET
Supervision
POR / BOD &
RESET
ATmega164A/PA/324A/PA/644A/PA/1284/P
PA7..0
PORT A (8)
PB7..0
PORT B (8)
GND
XTAL1
XTAL2
Watchdog
Timer
Watchdog
Oscillator
Oscillator
Circuits /
Clock
Generation
A/D
Converter
EEPROM
JTAG/OCD
TWI
PORT C (8)
Internal
Bandgap reference
CPU
SRAMFLASH
Analog
Comparator
SPI
8bit T/C 0
16bit T/C 1
8bit T/C 2
16bit T/C 3
PORT D (8)
USART 0
16bit T/C 1
USART 1
8272CS–AVR–06/11
TOSC1/PC6TOSC2/PC7
PC5..0
PD7..0
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
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
conventional CISC microcontrollers.
5
ATmega164A/PA/324A/PA/644A/PA/1284/P
The ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P provide the following features:
16/32/64/128Kbytes of In-System Programmable Flash with Read-While-Write capabilities,
512/1K/2K/4Kbytes EEPROM, 1/2/4/16Kbytes SRAM, 32 general purpose I/O lines, 32 general
purpose working registers, Real Time Counter (RTC), three flexible Timer/Counters with compare modes and PWM, 2 USARTs, a byte oriented 2-wire Serial Interface, a 8-channel, 10-bit
ADC with optional differential input stage with programmable gain, programmable Watchdog
Timer with Internal Oscillator, an SPI serial port, IEEE std. 1149.1 compliant JTAG test interface,
also used for accessing the On-chip Debug system and programming and six software selectable power saving modes. The Idle mode stops the CPU while allowing the SRAM,
Timer/Counters, 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
combined with low power consumption. In Extended Standby mode, both the main Oscillator
and the Asynchronous Timer continue to run.
Atmel offers the QTouch
functionality into AVR microcontrollers. The patented charge-transfer signal acquisition offers
robust sensing and includes fully debounced reporting of touch keys and includes Adjacent Key
Suppression
®
(AKS™) technology for unambiguous detection of key events. The easy-to-use
QTouch Suite toolchain allows you to explore, develop and debug your own touch applications.
®
library for embedding capacitive touch buttons, sliders and wheels
The device is manufactured using Atmel’s high-density nonvolatile memory technology. The Onchip ISP Flash allows the program memory to be reprogrammed in-system through an SPI serial
interface, by a conventional nonvolatile memory programmer, or by an On-chip Boot program
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 ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P is a powerful microcontroller that provides a highly flexible and cost effective solution to many embedded control
applications.
The ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P 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.
8272CS–AVR–06/11
6
ATmega164A/PA/324A/PA/644A/PA/1284/P
2.2 Comparison Between ATmega164A, ATmega164PA, ATmega324A, ATmega324PA, ATmega644A, ATmega644PA, ATmega1284 and ATmega1284P
Table 2-1. Differences between ATmega164A, ATmega164PA, ATmega324A, ATmega324PA, ATmega644A,
ATmega644PA, ATmega1284 and ATmega1284P
Device Flash EEPROM RAM Units
ATmega164A 16 K 512 1 K
ATmega164PA 16 K 512 1 K
ATmega324A 32 K 1 K 2 K
ATmega324PA 32 K 1 K 2 K
ATmega644A 64 K 2 K 4 K
ATmega644PA 64 K 2 K 4 K
ATmega1284 128 K 4 K 16 K
ATmega1284P 128 K 4 K 16 K
2.3 Pin Descriptions
2.3.1 VCC
bytes
Digital supply voltage.
2.3.2 GND
Ground.
2.3.3 Port A (PA7:PA0)
Port A serves as analog inputs to the Analog-to-digital Converter.
Port A also serves as an 8-bit bi-directional I/O port with internal pull-up resistors (selected for
each bit). The Port A output buffers have symmetrical drive characteristics with both high sink
and source capability. As inputs, Port A pins that are externally pulled low will source current if
the pull-up resistors are activated. The Port A pins are tri-stated when a reset condition becomes
active, even if the clock is not running.
Port A also serves the functions of various special features of the
ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P as listed on page 80.
2.3.4 Port B (PB7:PB0)
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.
Port B also serves the functions of various special features of the
ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P as listed on page 82.
2.3.5 Port C (PC7:PC0)
Port C is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The
Port C output buffers have symmetrical drive characteristics with both high sink and source
8272CS–AVR–06/11
7
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.
Port C also serves the functions of the JTAG interface, along with special features of the
ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P as listed on page 85.
2.3.6 Port D (PD7:PD0)
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.
Port D also serves the functions of various special features of the
ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P as listed on page 88.
2.3.7 RESET
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 ”System and Reset
Characteristics” on page 337. Shorter pulses are not guaranteed to generate a reset.
ATmega164A/PA/324A/PA/644A/PA/1284/P
2.3.8 XTAL1
2.3.9 XTAL2
2.3.10 AVCC
2.3.11 AREF
Input to the inverting Oscillator amplifier and input to the internal clock operating circuit.
Output from the inverting Oscillator amplifier.
AVCC is the supply voltage pin for Port A and the Analog-to-digital Converter. It should be externally connected to V
to V
through a low-pass filter.
CC
, even if the ADC is not used. If the ADC is used, it should be connected
CC
This is the analog reference pin for the Analog-to-digital Converter.
8272CS–AVR–06/11
8
3. Resources
A comprehensive set of development tools, application notes and datasheetsare available for
download on http://www.atmel.com/avr.
4. About Code Examples
This documentation contains simple code examples that briefly show how to use various parts of
the device. Be aware that not all C compiler vendors include bit definitions in the header files
and interrupt handling in C is compiler dependent. Please confirm with the C compiler documentation for more details.
The code examples assume that the part specific header file is included before compilation. For
I/O registers located in extended I/O map, "IN", "OUT", "SBIS", "SBIC", "CBI", and "SBI" instructions must be replaced with instructions that allow access to extended I/O. Typically "LDS" and
"STS" combined with "SBRS", "SBRC", "SBR", and "CBR".
Note: 1.
5. Data Retention
Reliability Qualification results show that the projected data retention failure rate is much less
than 1 PPM over 20 years at 85°C or 100 years at 25°C.
ATmega164A/PA/324A/PA/644A/PA/1284/P
6. Capacitive touch sensing
The Atmel® QTouch® Library provides a simple to use solution to realize touch sensitive interfaces on most Atmel AVR
QTouch and QMatrix
Touch sensing can be added to any application by linking the appropriate Atmel QTouch Library
for the AVR Microcontroller. This is done by using a simple set of APIs to define the touch channels and sensors, and then calling the touch sensing API’s to retrieve the channel information
and determine the touch sensor states.
The QTouch Library is FREE and downloadable from the Atmel website at the following location:
www.atmel.com/qtouchlibrary. For implementation details and other information, refer to the
Atmel QTouch Library User Guide - also available for download from the Atmel website.
®
®
acquisition methods.
microcontrollers. The QTouch Library includes support for the
8272CS–AVR–06/11
9
ATmega164A/PA/324A/PA/644A/PA/1284/P
7. Register Summary
Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Page
(0xFF) Reserved - - - - - - -
(0xFE) Reserved - - - - - - - -
(0xFD) Reserved - - - - - - - -
(0xFC) Reserved
(0xFB) Reserved
(0xFA) Reserved - - - - - - - -
(0xF9) Reserved - - - - - - -
(0xF8) Reserved - - - - - - - -
(0xF7) Reserved - - - - - - - -
(0xF6) Reserved - - - - - - - -
(0xF5) Reserved - - - - - - -
(0xF4) Reserved - - - - - - - -
(0xF3) Reserved - - - - - - - -
(0xF2) Reserved - - - - - - - -
(0xF1) Reserved - - - - - - -
(0xF0) Reserved
(0xEF) Reserved
(0xEE) Reserved - - - - - - - -
(0xED) Reserved - - - - - - - -
(0xEC) Reserved - - - - - - - -
(0xEB) Reserved - - - - - - -
(0xEA) Reserved - - - - - - - -
(0xE9) Reserved - - - - - - - -
(0xE8) Reserved - - - - - - - -
(0xE7) Reserved - - - - - - -
(0xE6) Reserved - - - - - - - -
(0xE5) Reserved - - - - - - - -
(0xE4) Reserved - - - - - - - -
(0xE3) Reserved - - - - - - -
(0xE2) Reserved - - - - - - - -
(0xE1) Reserved - - - - - - -
(0xE0) Reserved - - - - - - -
(0xDF) Reserved - - - - - - - -
(0xDE) Reserved - - - - - - - -
(0xDD) Reserved - - - - - - - -
(0xDC) Reserved - - - - - - -
(0xDB) Reserved - - - - - - - -
(0xDA) Reserved - - - - - - - -
(0xD9) Reserved - - - - - - - -
(0xD8) Reserved
(0xD7) Reserved
(0xD6) Reserved - - - - - - - -
(0xD5) Reserved
(0xD4) Reserved
(0xD3) Reserved
(0xD2) Reserved - - - - - - - -
(0xD1) Reserved
(0xD0) Reserved
(0xCF) Reserved - - - - - - - -
(0xCE) UDR1 USART1 I/O Data Register 192
(0xCD) UBRR1H - - - - USART1 Baud Rate Register High Byte 196/209
(0xCC) UBRR1L USART1 Baud Rate Register Low Byte 196/209
(0xCB) Reserved
(0xCA) UCSR1C UMSEL11 UMSEL10 UPM11 UPM10 USBS1 UCSZ11/UDORD0
(0xC9) UCSR1B RXCIE1 TXCIE1 UDRIE1 RXEN1 TXEN1 UCSZ12 RXB81 TXB81 193/207
(0xC8) UCSR1A RXC1 TXC1 UDRE1 FE1 DOR1 UPE1 U2X1 MPCM1 192/207
(0xC7) Reserved
(0xC6) UDR0 USART0 I/O Data Register 192
(0xC5) UBRR0H - - - - USART0 Baud Rate Register High Byte 196/209
(0xC4) UBRR0L USART0 Baud Rate Register Low Byte 196/209
(0xC3) Reserved
(0xC2) UCSR0C UMSEL01 UMSEL00 UPM01 UPM00 USBS0 UCSZ01/UDORD0
(0xC1) UCSR0B RXCIE0 TXCIE0 UDRIE0 RXEN0 TXEN0 UCSZ02 RXB80 TXB80 193/207
- - - - - - - -
- - - - - - -
- - - - - - - -
- - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
(5)
UCSZ10/UCPHA0
(5)
UCSZ00/UCPHA0
(5)
UCPOL1 194/208
(5)
UCPOL0 194/208
8272CS–AVR–06/11
10
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