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8-bit Microcontroller with 16/32/64K Bytes In-SystemProgrammable Flash
– 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– 16/32/64K Bytes of In-System Self-programmable Flash program memory– 512B/1K/2K Bytes EEPROM– 1/2/4K Bytes 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
– 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
• Peripheral Features– Two 8-bit Timer/Counters with Separate Prescalers and Compare Modes– 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
• 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
• Special Microcontroller Features– 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
2. OverviewThe ATmega164P/324P/644P is a low-power CMOS 8-bit microcontroller based on the AVRenhanced RISC architecture. By executing powerful instructions in a single clock cycle, theATmega164P/324P/644P achieves throughputs approaching 1 MIPS per MHz allowing the sys-tem designer to optimize power consumption versus processing speed.
2.1 Block Diagram
Figure 2-1. Block Diagram
The AVR core combines a rich instruction set with 32 general purpose working registers. All the32 registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two independentregisters to be accessed in one single instruction executed in one clock cycle. The resulting
CPU
GND
VCC
RESET
PowerSupervision
POR / BOD &RESET
WatchdogOscillator
WatchdogTimer
OscillatorCircuits /
ClockGeneration
XTAL1
XTAL2
PORT A (8)
PORT D (8)
PD7..0
PORT C (8)
PC5..0
TWI
SPIEEPROM
JTAG/OCD 16bit T/C 1
8bit T/C 2
8bit T/C 0
SRAMFLASH
USART 0
Internal Bandgap reference
Analog Comparator
A/DConverter
PA7..0
PORT B (8)
PB7..0
USART 1
TOSC1/PC6TOSC2/PC7
38011GS–AVR–08/07
architecture is more code efficient while achieving throughputs up to ten times faster than con-ventional CISC microcontrollers.
The ATmega164P/324P/644P provides the following features: 16/32/64K bytes of In-SystemProgrammable Flash with Read-While-Write capabilities, 512B/1K/2K bytes EEPROM, 1/2/4Kbytes SRAM, 32 general purpose I/O lines, 32 general purpose working registers, Real TimeCounter (RTC), three flexible Timer/Counters with compare modes and PWM, 2 USARTs, a byteoriented 2-wire Serial Interface, a 8-channel, 10-bit ADC with optional differential input stagewith programmable gain, programmable Watchdog Timer with Internal Oscillator, an SPI serialport, IEEE std. 1149.1 compliant JTAG test interface, also used for accessing the On-chipDebug system and programming and six software selectable power saving modes. The Idlemode stops the CPU while allowing the SRAM, Timer/Counters, SPI port, and interrupt systemto continue functioning. The Power-down mode saves the register contents but freezes theOscillator, 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 basewhile the rest of the device is sleeping. The ADC Noise Reduction mode stops the CPU and allI/O modules except Asynchronous Timer and ADC, to minimize switching noise during ADCconversions. In Standby mode, the Crystal/Resonator Oscillator is running while the rest of thedevice is sleeping. This allows very fast start-up combined with low power consumption. InExtended Standby mode, both the main Oscillator and the Asynchronous Timer continue to run.
The device is manufactured using Atmel’s high-density nonvolatile memory technology. The On-chip ISP Flash allows the program memory to be reprogrammed in-system through an SPI serialinterface, by a conventional nonvolatile memory programmer, or by an On-chip Boot programrunning on the AVR core. The boot program can use any interface to download the applicationprogram in the application Flash memory. Software in the Boot Flash section will continue to runwhile the Application Flash section is updated, providing true Read-While-Write operation. Bycombining an 8-bit RISC CPU with In-System Self-Programmable Flash on a monolithic chip,the Atmel ATmega164P/324P/644P is a powerful microcontroller that provides a highly flexibleand cost effective solution to many embedded control applications.
The ATmega164P/324P/644P AVR is supported with a full suite of program and system devel-opment tools including: C compilers, macro assemblers, program debugger/simulators, in-circuitemulators, and evaluation kits.
2.2 Comparison Between ATmega164P, ATmega324P and ATmega644P
2.3 Pin Descriptions
2.3.1 VCCDigital supply voltage.
Table 2-1. Differences between ATmega164P and ATmega644P
Device Flash EEPROM RAM
ATmega164P 16 Kbyte 512 Bytes 1 Kbyte
ATmega324P 32 Kbyte 1 Kbyte 2 Kbyte
ATmega644P 64 Kbyte 2 Kbyte 4 Kbyte
48011GS–AVR–08/07
ATmega164P/324P/644P
ATmega164P/324P/644P
2.3.2 GNDGround.
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 foreach bit). The Port A output buffers have symmetrical drive characteristics with both high sinkand source capability. As inputs, Port A pins that are externally pulled low will source current ifthe pull-up resistors are activated. The Port A pins are tri-stated when a reset condition becomesactive, even if the clock is not running.
Port A also serves the functions of various special features of the ATmega164P/324P/644P aslisted 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). ThePort B output buffers have symmetrical drive characteristics with both high sink and sourcecapability. As inputs, Port B pins that are externally pulled low will source current if the pull-upresistors 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 ATmega164P/324P/644P aslisted 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). ThePort C output buffers have symmetrical drive characteristics with both high sink and sourcecapability. As inputs, Port C pins that are externally pulled low will source current if the pull-upresistors 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 theATmega164P/324P/644P 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). ThePort D output buffers have symmetrical drive characteristics with both high sink and sourcecapability. As inputs, Port D pins that are externally pulled low will source current if the pull-upresistors 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 ATmega164P/324P/644P aslisted on page 87.
2.3.7 RESETReset input. A low level on this pin for longer than the minimum pulse length will generate areset, even if the clock is not running. The minimum pulse length is given in ”System and ResetCharacteristics” on page 331. Shorter pulses are not guaranteed to generate a reset.
2.3.8 XTAL1Input to the inverting Oscillator amplifier and input to the internal clock operating circuit.
58011GS–AVR–08/07
2.3.9 XTAL2Output from the inverting Oscillator amplifier.
2.3.10 AVCCAVCC is the supply voltage pin for Port F and the Analog-to-digital Converter. It should be exter-nally connected to VCC, even if the ADC is not used. If the ADC is used, it should be connectedto VCC through a low-pass filter.
2.3.11 AREFThis is the analog reference pin for the Analog-to-digital Converter.
3. ResourcesA comprehensive set of development tools, application notes and datasheetsare available fordownload on http://www.atmel.com/avr.
4. Data RetentionReliability Qualification results show that the projected data retention failure rate is much lessthan 1 PPM over 20 years at 85°C or 100 years at 25°C.
68011GS–AVR–08/07
ATmega164P/324P/644P
ATmega164P/324P/644P
5. Register SummaryAddress Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Page
Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Page
98011GS–AVR–08/07
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 $00 - $1F are directly bit-accessible using the SBI and CBI instructions. In these reg-isters, 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 the CBI and SBI instructions will operate on all bits in the I/O register, writing a one back into any flag read as set, thus clearing the flag. 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 $00 - $3F must be used. When addressing I/O regis-ters as data space using LD and ST instructions, $20 must be added to these addresses. The ATmega164P/324P/644P 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 $60 - $FF, only the ST/STS/STD and LD/LDS/LDD instructions can be used.
0x1E (0x3E) GPIOR0 General Purpose I/O Register 0 28
Notes: 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). AlsoHalide free and fully Green.
3. For Speed vs. VCC see ”Speed Grades” on page 329.
Speed (MHz)(3) Power Supply Ordering Code Package(1) Operational Range
44M1 44-pad, 7 x 7 x 1.0 mm body, lead pitch 0.50 mm, Quad Flat No-Lead/Micro Lead Frame Package (QFN/MLF)
148011GS–AVR–08/07
ATmega164P/324P/644P
ATmega164P/324P/644P
7.2 ATmega324P
Notes: 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). AlsoHalide free and fully Green.
3. For Speed vs. VCC see ”Speed Grades” on page 329.
Speed (MHz)(3) Power Supply Ordering Code Package(1) Operational Range
44M1 44-pad, 7 x 7 x 1.0 mm body, lead pitch 0.50 mm, Quad Flat No-Lead/Micro Lead Frame Package (QFN/MLF)
158011GS–AVR–08/07
7.3 ATmega644P
Notes: 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). AlsoHalide free and fully Green.
3. For Speed vs. VCC see ”Speed Grades” on page 329.
Speed (MHz)(3) Power Supply Ordering Code Package(1) Operational Range
Notes: 1. This package conforms to JEDEC reference MS-011, Variation AC. 2. Dimensions D and E1 do not include mold Flash or Protrusion.
Mold Flash or Protrusion shall not exceed 0.25 mm (0.010").
188011GS–AVR–08/07
ATmega164P/324P/644P
ATmega164P/324P/644P
8.3 44M1
2325 Orchard Parkway San Jose, CA 95131
TITLE DRAWING NO.
R
REV. 44M1, 44-pad, 7 x 7 x 1.0 mm Body, Lead Pitch 0.50 mm,
G44M1
5/27/06
COMMON DIMENSIONS(Unit of Measure = mm)
SYMBOL MIN NOM MAX NOTE
A 0.80 0.90 1.00
A1 – 0.02 0.05
A3 0.25 REF
b 0.18 0.23 0.30
D
D2 5.00 5.20 5.40
6.90 7.00 7.10
6.90 7.00 7.10
E
E2 5.00 5.20 5.40
e 0.50 BSC
L 0.59 0.64 0.69
K 0.20 0.26 0.41Note: JEDEC Standard MO-220, Fig. 1 (SAW Singulation) VKKD-3.
TOP VIEW
SIDE VIEW
BOTTOM VIEW
D
E
Marked Pin# 1 ID
E2
D2
b e
Pin #1 CornerL
A1
A3
A
SEATING PLANE
Pin #1 Triangle
Pin #1 Chamfer(C 0.30)
Option A
Option B
Pin #1 Notch(0.20 R)
Option C
K
K
123
5.20 mm Exposed Pad, Micro Lead Frame Package (MLF)
198011GS–AVR–08/07
9. Errata
9.1 ATmega164P Rev. ANo known Errata.
9.2 ATmega324P Rev. ANo known Errata.
9.3 ATmega644P Rev. ANo known Errata.
208011GS–AVR–08/07
ATmega164P/324P/644P
ATmega164P/324P/644P
10. Datasheet Revision HistoryPlease note that the referring page numbers in this section are referred to this document. Thereferring revision in this section are referring to the document revision.
10.1 Rev. 8011G- 08/07
10.2 Rev. 8011F- 04/07
10.3 Rev. 8011E - 04/07
1. Updated ”Features” on page 12. Added ”Data Retention” on page 8.3. Updated ”SPH and SPL – Stack Pointer High and Stack pointer Low” on page 14.4. LCD reference removed from table note in ”Sleep Modes” on page 42. 5. Updated code example in ”Bit 0 – IVCE: Interrupt Vector Change Enable” on page 65.6. Removed reference to External Memory Interface in ”Alternate Functions of Port A” on
page 80.7. Updated ”Data Reception – The USART Receiver” on page 180.8. Updated ”ADCSRB – ADC Control and Status Register B” on page 238.9. Updated overview in ”ADC - Analog-to-digital Converter” on page 240.10. Added ”ATmega644P Typical Characteristic” on page 388.11. Updated Figure 28-31 on page 354, Figure 28-32 on page 355,Figure 28-33 on page
35512. Updated notes in Table 8-3 on page 32.Table 8-8 on page 35, Table 8-9 on page 36,
and Table 8-11 on page 37.13. Updated Table 13-7 on page 84, Table 13-8 on page 84, Table 13-10 on page 86,
Table 13-11 on page 87, Table 13-14 on page 90, Table 27-1 on page 327,Table 27-2on page 327,Table 27-5 on page 330, Table 27-9 on page 332, and Table 27-12 onpage 336
14. Updated ”ATmega324P DC Characteristics” on page 327 and ”ATmega644P DC Char-acteristics” on page 328.
15. Updated Table 27-7 on page 331 and Table 8-13 on page 37.
1. Updated ”Watchdog Timer Configuration” on page 59.
1. Updated ”GTCCR – General Timer/Counter Control Register” on page 159.2. Updated ”EECR – The EEPROM Control Register” on page 23.
218011GS–AVR–08/07
10.4 Rev. 8011D - 02/07
10.5 Rev. 8011C - 10/06
10.6 Rev. 8011B - 09/06
10.7 Rev. 8011A - 08/06
1. Updated “Pinout ATmega164P/324P/644P” on page 2.2. Updated ”Power-down Mode” on page 44.3. Updated note in Table 11-1 on page 68.4. Updated Table 23-1 on page 272.5. Updated ”Boot Size Configuration(1)” on page 289.6. Updated VOL limits in ”DC Characteristics” on page 325.7. Updated note 3 and 4 in ”DC Characteristics” on page 325.8. Added note to ”ATmega164P DC Characteristics” on page 327.9. Added note to ”ATmega324P DC Characteristics” on page 327.10. Updated Figure 27-13 on page 345 and Figure 27-60 on page 370.
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