ATMEGA644A-PU

The ATmega644A 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 ATmega644A achieves throughputs approaching 1 MIPS per MHz allowing the system designer to optimize power consumption versus processing speed.

• High-performance, low-power 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 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(1)
  • 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
• QTouch® library support
  • Capacitive touch buttons, sliders and wheels
  • QTouch and QMatrix acquisition
  • Up to 64 sense channels