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The Arduino Leonardo R3 differs from all preceding boards in that the ATmega32u4 has built-in USB communication, eliminating the need for a secondary processor. This allows the Leonardo to appear to a connected computer as a mouse and keyboard, in addition to a virtual (CDC) serial / COM port.
| Microcontroller | ATmega32U4 |
| Operating Voltage | 5 V |
| Input Voltage (recommended) | 7-12 V |
| Input Voltage (limit) | 6-20 V |
| Digital I/O Pins | 20 (of which 7 provide PWM output) |
| PWM Digital I/O Pins | 7 |
| Analog Input Pins | 12 |
| DC Current per I/O Pin | 40 mA |
| Flash Memory | 32 KB |
| SRAM | 2.5 KB |
| EEPROM | 1 KB |
| Clock Speed | 16 MHz |
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