20 mA DC current per I/O pin
50 mA DC current for 3.3 Vdc pin
記憶體 Memory
Flash memory 256 KB of which 8 KB is used by bootloader
SRAM 8 KB
EEPROM 4 KB
時脈 Clock Speed
16 MHz
信號 Signal
PWM at pins 2~13, and 44~46
External interrupts at pins 2~3, and 18~21
Serial/UART at pins 0 (RX) and 1 (TX)
Serial 1 at pins 19 (RX) and 18 (TX)
Serial 2 at pins 17 (RX) and 16 (TX)
Serial 3 at pins 15 (RX) and 14 (TX)
I2C/TWI at pins 20 (SDA) and 21 (SCL)
SPI at pins 53 (/SS), 51 (MOSI), 50 (MISO), and 52 (SCK)
用戶介面 User Interface
1×LED (ON) for indicating power
1×LED (RX) for indicating RX data transmission via FTDI chip and USB connection to computer
1×LED (TX) for indicating TX data transmission via FTDI chip and USB connection to computer
1×LED (L) at pin 13
1×Reset button (RESET)
連接介面 Connection Interface
1×USB Type B socket
1×2.1 mm center positive barrel power socket
54×Digital I/O pin
16×Analog input pin
1×Vin pin
1×3.3 Vdc (3.3V) pin
1×5 Vdc (5V) pin
3×Ground (GND) pin
1×Reset (RESET) pin
1×Reference (AREF) pin
1×Reference (IOREF) pin
1×ICSP male header
