ATMEGA644A-AUR Atmel, ATMEGA644A-AUR Datasheet - Page 6
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ATMEGA644A-AUR
Manufacturer Part Number
ATMEGA644A-AUR
Description
IC MCU AVR 64K FLASH 44TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA644A-AUR
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
2.2
Table 2-1.
8272AS–AVR–01/10
Device
ATmega164A
ATmega164PA
ATmega324A
ATmega324PA
ATmega644A
ATmega644PA
ATmega1284
ATmega1284P
Comparison Between ATmega164A, ATmega164PA, ATmega324A, ATmega324PA,
ATmega644A, ATmega644PA, ATmega1284 and ATmega1284P
Differences between ATmega164A, ATmega164PA, ATmega324A, ATmega324PA, ATmega644A,
ATmega644PA, ATmega1284 and ATmega1284P
Flash
16 K
16 K
32 K
32 K
64 K
64 K
128 K
128 K
16/32/64/128K bytes of In-System Programmable Flash with Read-While-Write capabilities,
512B/1K/2K/4K bytes EEPROM, 1/2/4/16K/ bytes SRAM, 32 general purpose I/O lines, 32 gen-
eral purpose working registers, Real Time Counter (RTC), three flexible Timer/Counters with
compare modes and PWM, 2 USARTs, a byte oriented 2-wire Serial Interface, a 8-channel, 10-
bit ADC with optional differential input stage with programmable gain, programmable Watchdog
Timer with Internal Oscillator, an SPI serial port, IEEE std. 1149.1 compliant JTAG test interface,
also used for accessing the On-chip Debug system and programming and six software select-
able power saving modes. The Idle mode stops the CPU while allowing the SRAM,
Timer/Counters, SPI port, and interrupt system to continue functioning. The Power-down mode
saves the register contents but freezes the Oscillator, 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 base while the rest of the device is sleeping. The ADC
Noise Reduction mode stops the CPU and all I/O modules except Asynchronous Timer and
ADC, to minimize switching noise during ADC conversions. In Standby mode, the Crystal/Reso-
nator Oscillator is running while the rest of the device is sleeping. This allows very fast start-up
combined with low power consumption. In Extended 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 serial
interface, by a conventional nonvolatile memory programmer, or by an On-chip Boot program
running on the AVR core. The boot program can use any interface to download the application
program in the application Flash memory. Software in the Boot Flash section will continue to run
while the Application Flash section is updated, providing true Read-While-Write operation. By
combining an 8-bit RISC CPU with In-System Self-Programmable Flash on a monolithic chip,
the Atmel ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P is a powerful microcon-
troller that provides a highly flexible and cost effective solution to many embedded control
applications.
The ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P AVR is supported with a full
suite of program and system development tools including: C compilers, macro assemblers, pro-
gram debugger/simulators, in-circuit emulators, and evaluation kits.
164A/164PA/324A/324PA/644A/644PA/1284/1284P
EEPROM
512
512
1 K
1 K
2 K
2 K
4 K
4 K
RAM
1 K
1 K
2 K
2 K
4 K
4 K
16 K
16 K
Units
bytes
6