Microchip ATMEGA644-20AU, 8bit AVR Microcontroller, ATmega, 20MHz, 64 kB Flash, 44-Pin TQFP

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 perMHz 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 x 8 General Purpose Working Registers
Fully Static Operation
Up to 16 MIPS Throughput at 16MHz
On-chip 2-cycle Multiplier
High Endurance Non-volatile Memory segments
16Kb of In-System Self-programmable Flash program memory
512 Bytes EEPROM
1Kb Internal SRAM
Write/Erase Cycles: 10,000 Flash/100,000 EEPROM