ATMEGA644A-PU Atmel, ATMEGA644A-PU Datasheet - Page 578
![IC MCU AVR 64K FLASH 40PDIP](/photos/6/70/67049/453-40-dip_sml.jpg)
ATMEGA644A-PU
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
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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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