8-bit ATMega AVR microcontroller, 4 KB, 20 MHz, TQFP-32

General Description
The high-performance Microchip 8-bit AVR® RISC-based picoPower® microcontroller combines 4 KB ISP flash memory, 256B EEPROM, 512B SRAM, 23 general purpose I/O lines, 32 general purpose working registers, three flexible timer/counters with compare modes, internal and external interrupts, serial programmable USART, a byte-oriented two-wire serial interface, SPI serial port, 6-channel 10-bit A/D converter (8-channels in TQFP and QFN/MLF packages), programmable watchdog timer with internal oscillator, and five software selectable power saving modes. The device operates between 1.8-5.5 volts.

Features
- Program Memory Type: Flash
- Program Memory Size (KB): 4
- CPU Speed (MIPS/DMIPS): 20
- SRAM (B): 512
- Data EEPROM/HEF (bytes): 256
- Digital Communication Peripherals: 1-UART, 2-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: 32
- Low Power: Yes