ATMEGA644-20AU

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.

• High-performance, Low-power Atmel® AVR® 8-bit Microcontroller
• Advanced RISC Architecture
  • 131 Powerful Instructions – Most Single-clock Cycle Execution
  • 32 × 8 General Purpose Working Registers
  • Fully Static Operation
  • Up to 20 MIPS Throughput at 20MHz
• High Endurance Non-volatile Memory segments
  • 64 Kbytes of In-System Self-programmable Flash program memory
  • 2 Kbytes EEPROM
  • 4 Kbytes 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
  • Prog