ATMEGA644P-20AU Atmel, ATMEGA644P-20AU Datasheet - Page 436

• Manufacturer Part Number: ATMEGA644P-20AU
• Description: IC MCU AVR 64K FLASH 44-TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA644P-20AU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Size: 64KB (32K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 2K x 8
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-TQFP, 44-VQFP
• Processor Series: ATMEGA64x
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 4 KB
• Interface Type: 2-Wire, SPI, UART
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 3
• Operating Supply Voltage: 4.5 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 8 channel
• A/d Inputs: 8-Channel, 10-Bit
• Cpu Speed: 20 MIPS
• Eeprom Memory: 2K Bytes
• Input Output: 32
• Interface: 2-Wire/JTAG/SPI/USART
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 44-pin TQFP
• Programmable Memory: 64K Bytes
• Timers: 2-8-bit, 1-16-bit
• Voltage, Range: 2.7-5.5 V
• Cpu Family: ATmega
• Device Core: AVR
• Device Core Size: 8b
• Frequency (max): 20MHz
• Total Internal Ram Size: 4KB
• # I/os (max): 32
• Number Of Timers - General Purpose: 3
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 2.7V
• Instruction Set Architecture: RISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 44
• Controller Family/series: AVR MEGA
• No. Of I/o's: 32
• Eeprom Memory Size: 2KB
• Ram Memory Size: 4KB
• Rohs Compliant: Yes
• For Use With: ATSTK600-TQFP44 - STK600 SOCKET/ADAPTER 44-TQFPATSTK600-DIP40 - STK600 SOCKET/ADAPTER 40-PDIP770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAG770-1005 - ISP 4PORT FOR ATMEL AVR MCU JTAG770-1004 - ISP 4PORT FOR ATMEL AVR MCU SPIATAVRISP2 - PROGRAMMER AVR IN SYSTEM
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8011O–AVR–07/10
22 IEEE 1149.1 (JTAG) Boundary-scan ................................................... 266
23 Boot Loader Support – Read-While-Write Self-Programming ......... 276
24 Memory Programming ......................................................................... 293
25 Electrical Characteristics .................................................................... 325
22.1 Features .............................................................................................................266
22.2 Overview ............................................................................................................266
22.3 Data Registers ....................................................................................................267
22.4 Boundary-scan Specific JTAG Instructions ........................................................268
22.5 Boundary-scan Chain .........................................................................................269
22.6 ATmega164P/324P/644P Boundary-scan Order ...............................................272
22.7 Boundary-scan Description Language Files .......................................................274
22.8 Register Description ...........................................................................................275
23.1 Features .............................................................................................................276
23.2 Overview ............................................................................................................276
23.3 Application and Boot Loader Flash Sections ......................................................276
23.4 Read-While-Write and No Read-While-Write Flash Sections .............................277
23.5 Boot Loader Lock Bits ........................................................................................279
23.6 Entering the Boot Loader Program .....................................................................280
23.7 Addressing the Flash During Self-Programming ................................................281
23.8 Self-Programming the Flash ...............................................................................282
23.9 Register Description ...........................................................................................291
24.1 Program And Data Memory Lock Bits ................................................................293
24.2 Fuse Bits ............................................................................................................294
24.3 Signature Bytes ..................................................................................................296
24.4 Calibration Byte ..................................................................................................296
24.5 Page Size ...........................................................................................................296
24.6 Parallel Programming Parameters, Pin Mapping, and Commands ....................297
24.7 Parallel Programming .........................................................................................299
24.8 Serial Downloading ............................................................................................308
24.9 Serial Programming Instruction set ....................................................................310
24.10 Programming via the JTAG Interface ...............................................................312
25.1 DC Characteristics .............................................................................................325
25.2 Speed Grades ....................................................................................................329
25.3 Clock Characteristics ..........................................................................................330
25.4 System and Reset Characteristics .....................................................................331
ATmega164P/324P/644P
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