USART's are used for generic serial communication between AVR32 processors and peripherals.
Three USARTs are available on product. The USART0 and USART1 are connected to external DB9 connectors and USART2 and USART3 are accessible through expansion headers.
| Signal | Description | Peripheral and Connectors | Available on GPIO |
|---|---|---|---|
| U0_RX | Receive serial data | (1),(5) | Expansion Header |
| U0_TX | Transmit serial data | (1),(5) | Expansion Header |
| U0_CTS | Clear to send | (1),(5) | Expansion Header |
| U0_RTS | Request to send | (1),(5) | Expansion Header |
| U0_CLK | Serial clock | (5) | Expansion Header |
| U1_RX | Receive serial data | (1),(5) | Expansion Header |
| U1_TX | Transmit serial data | (1),(5) | Expansion Header |
| U1_CTS | Clear to send | (1),(5) | Expansion Header |
| U1_RTS | Request to send | (1),(5) | Expansion Header |
| U1_CLK | Serial clock | (5) | Expansion Header |
| U1_RI | Ring indicator | (1),(5) | Expansion Header |
| U1_DTR | Data Terminal Ready | (1),(5) | Expansion Header |
| U1_DSR | Data Set Ready | (1),(5) | Expansion Header |
| U1_DCD | Data Carrier Detect | (1),(5) | Expansion Header |
| U2_RX | Receive serial data | (5) | Expansion Header |
| U2_TX | Transmit serial data | (5) | Expansion Header |
| U2_CLK | Serial clock | (5) | Expansion Header |
| U3_RX | Receive serial data | (5) | Expansion Header |
| U3_TX | Transmit serial data | (5) | Expansion Header |
| U3_CLK | Serial clock | (5) | Expansion Header |