8-bit ATMega AVR® microcontroller, 64 KB, 20 MHz, TQFP-44

ATmega644PA

Description:
The high-performance Microchip 8-bit AVR® RISC-based picoPower® microcontroller combines 64 KB ISP flash memory with read-while-write capabilities, 2 KB EEPROM, 4 KB SRAM, 32 general purpose I/O lines, 32 general purpose working registers, a real-time counter, three flexible timer/counters with compare modes and PWM, two USARTs, a byte-oriented two-wire serial interface, an 8-channel 10-bit A/D converter with optional differential input stage with programmable gain, programmable watchdog timer with internal oscillator, SPI serial port, a JTAG (IEEE 1149.1 compliant) test interface for on-chip debugging and programming, and six software selectable power saving modes. The device operates between 1.8-5.5 volts.
By executing powerful instructions in a single clock cycle, the device achieves throughputs approaching 1 MIPS per MHz, balancing power consumption and processing speed.

Features:
- Program Memory Type: Flash
- Program Memory Size (KB): 64
- CPU Speed (MIPS/DMIPS): 20
- SRAM (B): 4,096
- Data EEPROM/HEF (bytes): 2048
- Digital Communication Peripherals: 2-UART, 3-SPI, 1-I2C
- Capture/Compare/PWM Peripherals: 1 Input Capture, 1 CCP, 6PWM
- Timers: 2 x 8-bit, 1 x 16-bit
- Number of Comparators: 1
- Temperature Range (°C): -40 to 85
- Operating Voltage Range (V): 1.8 to 5.5
- Pin Count: 40/44
- Low Power: Yes