The ATMEGA644PV-10AU is a low-power CMOS 8-bit AVR RISC -based Microcontroller. By executing powerful instructions in a single clock cycle, the ATmega644P achieves throughputs approaching 1MIPS per MHz allowing the system designer to optimize power consumption versus processing speed. The ATmega644P provides 64kB of in-system programmable flash with read-while-write capabilities, 2kB EEPROM, 4kB SRAM, 32 general purpose I/O lines, 32 general purpose working registers, real time counter (RTC), three flexible timers/counters with compare modes and PWM, 2 USARTs, a byte oriented 2-wire Serial Interface, a 8- channel, 10-bit ADC with optional differential input stage with programmable gain, programmable Watchdog Timer with Internal Oscillator, an SPI serial port, IEEE std. 1149.1 compliant JTAG test interface.
Advanced RISC architecture
Power-on reset and programmable brown-out detection
Internal calibrated RC oscillator
External and internal interrupt sources
Six sleep modes - idle, ADC noise reduction, power-save, power-down, standby and extended standby
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
JTAG (IEEE std. 1149.1 compliant) interface
Programmable watchdog timer with separate on-chip oscillator
On-chip analog comparator
Interrupt and wake-up on pin change
Two 8-bit timers/counters with separate prescalers and compare modes
One 16-bit timer/counter with separate prescaler, compare mode and capture mode
