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ATmega644 带有64K系统内可编程Flash存储器

Flash (Kbytes)	64
EEPROM (Kbytes)	2
SRAM (Bytes)	4096
Max I/O Pins	32
F.max (MHz)	20
Vcc (V)	1.8-5.5
16-bit Timers	1
8-bit Timer	2
PWM (channels)	6
RTC	Yes
SPI	1+USART
UART	1
TWI	Yes
ISP	Yes
10-bit A/D (Channe)	8
Analog Comparator	Yes
Brown Out Detector	Yes
Watchdog	Yes
On Chip Oscillator	Yes
Hardware Multiplie	Yes
Interrupts	31
Ext Interrupts	32
Self Program Memor	Yes
Pb-Free Packages	TQFP 44 MLF 44 PDIP 40

64-Kbyte self-programming Flash Program Memory, 4-Kbyte SRAM, 2-KByte EEPROM, 8 Channel 10-bit A/D-converter. JTAG interface for on-chip-debug. Up to 20 MIPS throughput at 20 MHz. 1.8 - 5.5 Volt Operation.

The ATmega644 is a low-power CMOS 8-bit microcontroller based on the AVR enhanced RISC architecture. By executing powerful instructions in a single clock cycle, the ATmega644 achieves throughputs approaching 1 MIPS per MHz allowing the system designer to optimize power consumption versus processing speed.

ATmega644 特性

• High-performance, Low-power AVR® 8-bit Microcontroller
• Advanced RISC Architecture
  – 131 Powerful Instructions – Most Single-clock Cycle Execution
  – 32 x 8 General Purpose Working Registers
  – Fully Static Operation
  – Up to 20 MIPS Throughput at 20 MHz
• High Endurance Non-volatile Memory segments
  – 64K Bytes of In-System Self-programmable Flash program memory
  – 2K Bytes EEPROM
  – 4K Bytes Internal SRAM
  – Write/Erase cyles: 10,000 Flash/100,000 EEPROM(1)(3)
  – Data retention: 20 years at 85°C/100 years at 25°C(2)(3)
  – Optional Boot Code Section with Independent Lock Bits
  In-System Programming by On-chip Boot Program
  True Read-While-Write Operation
  – Programming Lock for Software Security
• JTAG (IEEE std. 1149.1 Compliant) Interface
  – Boundary-scan Capabilities According to the JTAG Standard
  – Extensive On-chip Debug Support
  – Programming of Flash, EEPROM, Fuses, and Lock Bits through the JTAG Interface
• Peripheral Features
  – Two 8-bit Timer/Counters with Separate Prescalers and Compare Modes
  – One 16-bit Timer/Counter with Separate Prescaler, Compare Mode, and Capture Mode
  – Real Time Counter with Separate Oscillator
  – Six PWM Channels
  – 8-channel, 10-bit ADC
  Differential mode with selectable gain at 1x, 10x or 200x
  – Byte-oriented Two-wire Serial Interface
  – One Programmable Serial USART
  – Master/Slave SPI Serial Interface
  – Programmable Watchdog Timer with Separate On-chip Oscillator
  – On-chip Analog Comparator
  – Interrupt and Wake-up on Pin Change
• Special Microcontroller Features
  – Power-on Reset and Programmable Brown-out Detection
  – Internal Calibrated RC Oscillator
  – External and Internal Interrupt Sources
  – Six Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down, Standby
  and Extended Standby
• I/O and Packages
  – 32 Programmable I/O Lines
  – 40-pin PDIP, 44-lead TQFP, and 44-pad QFN/MLF
• Speed Grades
  – ATmega644V: 0 - 4MHz @ 1.8 - 5.5V, 0 - 10MHz @ 2.7 - 5.5V
  – ATmega644: 0 - 10MHz @ 2.7 - 5.5V, 0 - 20MHz @ 4.5 - 5.5V
• Power Consumption at 1 MHz, 3V, 25°C for
  – Active: 240 μA @ 1.8V, 1MHz
  – Power-down Mode: 0.1 μA @ 1.8V

ATmega644 订购型号

Speed (MHz)	Power Supply	Ordering Code	Package	Operation Range
10	1.8 - 5.5V	ATmega644V-10AU ATmega644V-10PU ATmega644V-10MU	44A 40P6 44M1	Industrial (-40°C to 85°C)
20	2.7 - 5.5V	ATmega644-20AU ATmega644-20PU ATmega644-20MU	44A 40P6 44M1	Industrial (-40°C to 85°C)

ATmega644 应用技术支持与电子电路设计开发资源下载

1. ATMEL 爱特梅尔AVR 微控制器ATmega644 数据手册DataSheet 下载. PDF
2. Atmel 爱特梅尔AVR 微控制器简介.PDF (编号:Tech AVR 000)MLF 32
3. 面向新手的AVR 开发工具,及基本知识.PDF(编号:Tech AVR 001)
4. 使用AVR 定时/计数器的PWM功能设计要点 .PDF
5. AVR指令集（版本：0856G–AVR–07/08）
6. AVR 微控制器汽车应用解决方案 . pdf
7. AVR 微控制器选型指南. pdf
8. ATMEL 爱特梅尔公司全线产品目录. pdf