The SAM4N Xplained Pro headers EXT1, EXT2, and EXT3 offers 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 Xplained Pro standard extension
header. All headers have a pitch of 2.54mm.
Table 4-1. Extension Header
EXT1| Pin on EXT1 | SAM4N pin | Function | Shared functionality |
|---|
| 1 | - | - | Communication line to ID chip on extension
board |
| 2 | - | - | GND |
| 3 | PA17 | AD0 | |
| 4 | PA18 | AD1 | |
| 5 | PA24 | GPIO | |
| 6 | PA25 | GPIO | SPARE HEADER2 |
| 7 | PC23 | TIOA3 | SPARE HEADER2 |
| 8 | PC24 | TIOB3 | SPARE HEADER2 |
| 9 | PA0 | WKUP0 | |
| 10 | PA23 | GPIO | |
| 11 | PA3 | TWD0 | EXT3 |
| 12 | PA4 | TWCK0 | EXT3, SPARE HEADER1 |
| 13 | PA21 | RXD1 | |
| 14 | PA22 | TXD1 | |
| 15 | PA11 | NPCS0 | |
| 16 | PA13 | SPI_MOSI | EXT2, EXT3 |
| 17 | PA12 | SPI_MISO | EXT2, EXT3 |
| 18 | PA14 | SPI_SCK | EXT2, EXT3 |
| 19 | - | - | GND |
| 20 | - | - | VCC |
Table 4-2. Extension Header
EXT2| Pin on EXT2 | SAM4N pin | Function | Shared functionality |
|---|
| 1 | - | - | Communication line to ID chip on extension
board |
| 2 | - | - | GND |
| 3 | PA19 | AD2 | |
| 4 | PA20 | AD3 | |
| 5 | PC0 | GPIO | |
| 6 | PC1 | GPIO | |
| 7 | PC26 | TIOA4 | |
| 8 | PC27 | TIOB4 | |
| 9 | PA1 | WKUP1 | |
| 10 | PC8 | GPIO | |
| 11 | PB0 | TWD2 | EDBG |
| 12 | PB1 | TWCK2 | EDBG |
| 13 | PA5 | RXD0 | |
| 14 | PA6 | TXD0 | |
| 15 | PC4 | NPCS1 | |
| 16 | PA13 | SPI_MOSI | EXT1, EXT3 |
| 17 | PA12 | SPI_MISO | EXT1, EXT3 |
| 18 | PA14 | SPI_SCK | EXT1, EXT3 |
| 19 | - | - | GND |
| 20 | - | - | VCC |
Table 4-3. Extension Header
EXT3| Pin on EXT3 | SAM4N pin | Function | Shared functionality |
|---|
| 1 | - | - | Communication line to ID chip on extension
board |
| 2 | - | - | GND |
| 3 | PC29 | AD13 | |
| 4 | PC30 | AD14 | |
| 5 | PC2 | GPIO | |
| 6 | PC3 | GPIO | |
| 7 | PA26 | TIOA2 | |
| 8 | PA27 | TIOB2 | |
| 9 | PB2 | WKUP12 | |
| 10 | PB3 | GPIO | |
| 11 | PA3 | TWD0 | EXT1 |
| 12 | PA4 | TWCK0 | EXT1, SPARE HEADER1 |
| 13 | PB10 | URXD3 | |
| 14 | PB11 | UTXD3 | |
| 15 | PC7 | NPCS2 | |
| 16 | PA13 | SPI_MOSI | EXT1, EXT2 |
| 17 | PA12 | SPI_MISO | EXT1, EXT2 |
| 18 | PA14 | SPI_SCK | EXT1, EXT2 |
| 19 | - | - | GND |
| 20 | - | - | VCC |
