ATMEGA644A-AU Atmel, ATMEGA644A-AU Datasheet - Page 574
![IC MCU AVR 64K FLASH 44TQFP](/photos/6/70/67042/313-44-tqfp_sml.jpg)
ATMEGA644A-AU
Manufacturer Part Number
ATMEGA644A-AU
Description
IC MCU AVR 64K FLASH 44TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA644A-AU
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
44-TQFP, 44-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATMEGA644A-AU
Manufacturer:
Atmel
Quantity:
135
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8272A–AVR–01/10
9
10 System Control and Reset .................................................................... 51
11 Interrupts ................................................................................................ 62
12 External Interrupts ................................................................................. 68
164A/164PA/324A/324PA/644A/644PA/1284/1284P
Power Management and Sleep Modes ................................................. 43
8.3Low Power Crystal Oscillator ...................................................................................33
8.4Full Swing Crystal Oscillator ....................................................................................34
8.5Low Frequency Crystal Oscillator ............................................................................35
8.6Calibrated Internal RC Oscillator .............................................................................37
8.7128 kHz Internal Oscillator ......................................................................................38
8.8External Clock .........................................................................................................38
8.9Timer/Counter Oscillator .........................................................................................39
8.10Clock Output Buffer ...............................................................................................39
8.11System Clock Prescaler ........................................................................................40
8.12Register Description ..............................................................................................41
9.1Overview .................................................................................................................43
9.2Sleep Modes ...........................................................................................................43
9.3BOD Disable
9.4Idle Mode .................................................................................................................44
9.5ADC Noise Reduction Mode ...................................................................................44
9.6Power-down Mode ..................................................................................................45
9.7Power-save Mode ...................................................................................................45
9.8Standby Mode .........................................................................................................45
9.9Extended Standby Mode .........................................................................................45
9.10Power Reduction Register .....................................................................................46
9.11Minimizing Power Consumption ............................................................................46
9.12Register Description ..............................................................................................48
10.1Resetting the AVR .................................................................................................51
10.2Internal Voltage Reference ....................................................................................55
10.3Watchdog Timer ....................................................................................................56
10.4Register Description ..............................................................................................59
11.1Overview ...............................................................................................................62
11.2Interrupt Vectors in ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P ..
11.3Register Description ..............................................................................................66
12.1Overview ...............................................................................................................68
62
(1)
.........................................................................................................44
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