The XMEGA A1U Xplained Pro headers EXT1, EXT2, and EXT3 offer
access to the I/O of the microcontroller in order to expand the board e.g. by connecting
extensions to the board. These headers all comply with the standard extension header
specified in Xplained Pro Standard Extension
Header. All headers have a pitch of 2.54mm.
Table 4-1. Extension Header
EXT1| Pin on EXT1 | XMEGA pin | Function | Shared functionality |
|---|
| 1 [ID] | - | - | Communication line to ID chip on extension
board |
| 2 [GND] | - | - | GND |
| 3 [ADC(+)] | PA0 | ADCA0 (GAINPOS) | Alternate signal header |
| 4 [ADC(-)] | PA4 | ADCA4 (GAINNEG) | |
| 5 [GPIO1] | PE6 | GPIO | |
| 6 [GPIO2] | PE7 | GPIO | Alternate signal header |
| 7 [PWM(+)] | PE1 | TCC0 OC0B | |
| 8 [PWM(-)] | PE0 | TCC0 OC0A | |
| 9 [IRQ/GPIO] | PR0 | GPIO | |
| 10 [SPI_SS_B/GPIO] | PR1 | GPIO | |
| 11 [TWI_SDA] | PC0 | TWIC SDA | EDBG and LCD Connector |
| 12 [TWI_SCL] | PC1 | TWIC SCL | EDBG and LCD Connector |
| 13 [USART_RX] | PC2 | USARTC0 RXD0 | |
| 14 [USART_TX] | PC3 | USARTC0 TXD0 | |
| 15 [SPI_SS_A] | PC4 | SPIC SS | |
| 16 [SPI_MOSI] | PC5 | SPIC MOSI | EXT2, EXT3, and LCD Connector |
| 17 [SPI_MISO] | PC6 | SPIC MISO | EXT2, EXT3, LCD Connector, and Alternate signal
header |
| 18 [SPI_SCK] | PC7 | SPIC SCK | EXT2, EXT3, LCD Connector, and Alternate signal
header |
| 19 [GND] | - | - | GND |
| 20 [VCC] | - | - | VCC |
Table 4-2. Extension Header
EXT2| Pin on EXT2 | XMEGA pin | Function | Shared functionality |
|---|
| 1 [ID] | - | - | Communication line to ID chip on extension
board |
| 2 [GND] | - | - | GND |
| 3 [ADC(+)] | PA1 | ADCA1 (GAINPOS) | |
| 4 [ADC(-)] | PA6 | ADCA6 (GAINNEG) | Alternate signal header |
| 5 [GPIO1] | PB4 | GPIO | |
| 6 [GPIO2] | PB5 | GPIO | |
| 7 [PWM(+)] | PE5 | TCE1 OC1B | |
| 8 [PWM(-)] | PE4 | TCE1 OC1A | |
| 9 [IRQ/GPIO] | PB6 | GPIO | Alternate signal header |
| 10 [SPI_SS_B/GPIO] | PB7 | GPIO | Alternate signal header |
| 11 [TWI_SDA] | PF0 | TWIF SDA | EXT3 |
| 12 [TWI_SCL] | PF1 | TWIF SCL | EXT3 |
| 13 [USART_RX] | PF2 | USARTF0 RXD0 | |
| 14 [USART_TX] | PF3 | USARTF0 TXD0 | |
| 15 [SPI_SS_A] | PF4 | GPIO | |
| 16 [SPI_MOSI] | PC5 | SPIC MOSI | EXT1, EXT3, and LCD Connector |
| 17 [SPI_MISO] | PC6 | SPIC MISO | EXT1, EXT3, LCD Connector, and Alternate signal
header |
| 18 [SPI_SCK] | PC7 | SPIC SCK | EXT1, EXT3, LCD Connector, and Alternate signal
header |
| 19 [GND] | - | - | GND |
| 20 [VCC] | - | - | VCC |
Table 4-3. Extension Header
EXT3| Pin on EXT3 | XMEGA pin | Function | Shared functionality |
|---|
| 1 [ID] | - | - | Communication line to ID chip on extension
board |
| 2 [GND] | - | - | GND |
| 3 [ADC(+)] | PA3 | ADCA3 (GAINPOS) | |
| 4 [ADC(-)] | PA7 | ADCA7 (GAINNEG) | Alternate signal header |
| 5 [GPIO1] | PK0 | GPIO | |
| 6 [GPIO2] | PK1 | GPIO | |
| 7 [PWM(+)] | PD5 | TCD1 OC1B | |
| 8 [PWM(-)] | PD4 | TCD1 OC1A | |
| 9 [IRQ/GPIO] | PK2 | GPIO | |
| 10 [SPI_SS_B/GPIO] | PK3 | GPIO | |
| 11 [TWI_SDA] | PF0 | TWIF SDA | EXT2 |
| 12 [TWI_SCL] | PF1 | TWIF SCL | EXT2 |
| 13 [USART_RX] | PF6 | USARTF1 RXD1 | |
| 14 [USART_TX] | PF7 | USARTF1 TXD1 | |
| 15 [SPI_SS_A] | PD0 | GPIO | |
| 16 [SPI_MOSI] | PC5 | SPIC MOSI | EXT1, EXT2, and LCD Connector |
| 17 [SPI_MISO] | PC6 | SPIC MISO | EXT1, EXT2, LCD Connector, and Alternate signal
header |
| 18 [SPI_SCK] | PC7 | SPIC SCK | EXT1, EXT2, LCD Connector, and Alternate signal
header |
| 19 [GND] | - | - | GND |
| 20 [VCC] | - | - | VCC |
