ATMEGA644A-PU Atmel, ATMEGA644A-PU Datasheet - Page 578

• Manufacturer Part Number: ATMEGA644A-PU
• Description: IC MCU AVR 64K FLASH 40PDIP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA644A-PU

• 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): 1.8 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 40-DIP (0.600", 15.24mm)
• Processor Series: ATmega
• Core: AVR
• Data Bus Width: 8 bit
• Data Ram Size: 4 KB
• Interface Type: JTAG, TWI, SPI, USART
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 3
• Operating Supply Voltage: 3.3 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• Minimum Operating Temperature: - 40 C
• Operating Temperature Range: - 40 C to + 85 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8272A–AVR–01/10
25 Boot Loader Support – Read-While-Write Self-Programming ......... 277
26 Memory Programming ......................................................................... 295
27 Electrical Characteristics .................................................................... 327
164A/164PA/324A/324PA/644A/644PA/1284/1284P
24.2Overview .............................................................................................................267
24.3Data Registers .....................................................................................................268
24.4Boundary-scan Specific JTAG Instructions .........................................................269
24.5Boundary-scan Chain ..........................................................................................270
24.6ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P Boundary-scan Order
24.7Boundary-scan Description Language Files ........................................................275
24.8Register Description ............................................................................................276
25.1Features ..............................................................................................................277
25.2Overview .............................................................................................................277
25.3Application and Boot Loader Flash Sections .......................................................277
25.4Read-While-Write and No Read-While-Write Flash Sections ..............................278
25.5Boot Loader Lock Bits .........................................................................................280
25.6Entering the Boot Loader Program ......................................................................281
25.7Addressing the Flash During Self-Programming .................................................282
25.8Self-Programming the Flash ................................................................................283
25.9Register Description ............................................................................................293
26.1Program And Data Memory Lock Bits .................................................................295
26.2Fuse Bits .............................................................................................................296
26.3Signature Bytes ...................................................................................................298
26.4Calibration Byte ...................................................................................................298
26.5Page Size ............................................................................................................298
26.6Parallel Programming Parameters, Pin Mapping, and Commands .....................299
26.7Parallel Programming ..........................................................................................301
26.8Serial Downloading .............................................................................................310
26.9Serial Programming Instruction set .....................................................................312
26.10Programming via the JTAG Interface ................................................................314
27.1DC Characteristics ..............................................................................................327
27.2Speed Grades .....................................................................................................333
27.3Clock Characteristics ...........................................................................................334
27.4System and Reset Characteristics ......................................................................335
27.5External Interrupts Characteristics ......................................................................335
273
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