Atmel / Microchip ATmega644PA 8位AVR®微控制器

Microchip ATmega644PA 8位AVR^® CMOS微控制器是基于AVR^®增强型RISC架构的低功耗器件。Atmel ATmega644PA是一款功能强大的8位微控制器，为各种嵌入式控制应用提供出色的灵活性和高性价比解决方案。ATmega644PA通过在单个时钟周期内使用多达131个功能强大的指令，产生接近每MHz 1MIPS的吞吐量。利用该过程，设计人员可以优化ATmega644PA的功耗与处理速度。Atmel AVR^®内核具有32x8通用工作寄存器以及广泛的指令集。32个通用工作寄存器直接连接到算法逻辑单元 (ALU)。这样即可在单个指令中访问两个独立寄存器，在一个时钟周期内执行，实现的吞吐量比传统CISC微控制器快10倍。

The ATmega644PA produces throughputs close to 1MIPS per MHz, by using up to 131 powerful instructions in a single clock cycle. Using this process, the designer can optimize the ATmega644PA for power consumption versus processing speed. The 32x8 general-purpose working registers with an extensive instruction set are combined in the Atmel AVR^® core.

The 32 general-purpose working registers are directly connected to the Arithmetic Logic Unit (ALU). This allows two independent registers to be accessed in a single instruction and executed in one clock cycle to achieve throughputs up to ten times faster than conventional CISC microcontrollers.

特性

Advanced RISC architecture
- 131 Powerful instructions
- Most single clock cycle execution
- 32 x 8 General purpose working registers
- Fully static operation
- Up to 20MIPS throughput at 20MHz
- On-chip 2-cycle multiplier
High endurance non-volatile memory segments
- 64KBytes of In-system self-programmable flash program
Memory
- 2KBytes EEPROM
- 4KBytes Internal SRAM
- Write/Erase cycles: 10,000 Flash/100,000 EEPROM
- Data retention: 20 years at 85°C/100 years at 25°C
- Optional boot code section with independent lock bits
In-system programming by an on-chip boot program
True Read-While-Write Operation
- Programming Lock for Software Security
Atmel QTouch^® Library Support
- Capacitive Touch Buttons, Sliders, and Wheels
- QTouch and QMatrix acquisition
- Up to 64 Sense Channels
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
32 Programmable I/O Lines
Packages: 40-pin PDIP, 44-lead TQFP, 44-pad VQFN/QFN

Peripheral
- Two 8-bit Timer/Counters with Separate Prescaler and Compare Mode
- One 16-bit Timer/Counter with Separate Prescaler, Compare Mode, and Capture Mode
- Real-Time Counter with Separate Oscillator
- 6 PWM Channels
- 8-channel 10-bit ADC
Differential Mode with Selectable Gain at 1×, 10× or 200×
- 1 Byte-oriented 2-wire Serial Interface (Philips I2C compatible)
- 2 Programmable Serial USART
- 1 Master/Slave SPI Serial Interface
- Programmable Watchdog Timer with Separate On-chip Oscillator
- On-chip Analog Comparator
- Interrupt and Wake-up on Pin Change
Power-on Reset and Programmable Brown-out Detection
Internal Calibrated RC Oscillator
External and Internal Interrupt Sources
6 Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down, Standby, and Extended Standby
Speed Grades
- 0 - 4MHz @ 1.8V - 5.5V
- 0 - 10MHz @ 2.7V - 5.5V
- 0 - 20MHz @ 4.5 - 5.5V
Power Consumption at 1MHz, 1.8V, 25°C
- Active Mode: 0.4mA
- Power-down Mode: 0.1μA
- Power-save Mode: 0.6μA (Including 32kHz RTC)
Operating Voltage: 1.8V to 5.5V