Atmel / Microchip ATmega644PA 8-bit AVR® Microcontrollers

Microchip ATmega644PA 8-bit AVR® CMOS Microcontrollers are low-power and based on the AVR® enhanced RISC architecture. The Atmel ATmega644PA is a powerful 8-bit microcontroller, that offers excellent flexibility and a cost-effective solution to a wide range of embedded control applications.

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.


  • 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

Block Diagram

Block Diagram - Atmel / Microchip ATmega644PA 8-bit AVR® Microcontrollers
Publicado: 2017-07-12 | Actualizado: 2023-08-17