The SAM4L8 Xplained Pro headers EXT1, EXT2, EXT3, and EXT4 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 standard Xplained Pro extension
header specification. All headers have a pitch of 2.54mm.
Table 4-1. Extension Header
EXT1| Pin on EXT1 | SAM4L8 pin | Function | Shared functionality |
|---|
| 1 | - | - | Communication line to ID chip on extension
board |
| 2 | - | - | GND |
| 3 | PA04 | ADCIFE/AD[0] | |
| 4 | PA05 | ADCIFE/AD[1] | |
| 5 | PB12 | GPIO | LCD connector (EXT5) |
| 6 | PC02 | GPIO | |
| 7 | PC00 | TC/1/A0 | |
| 8 | PC01 | TC/1/B0 | |
| 9 | PC25 | EIC/EXTINT[2] | LCD connector (EXT5) |
| 10 | PB13 | SPI/NPCS[1] | LCD connector (EXT5) |
| 11 | PA23 | TWIMS/0/TWD | LCD connector (EXT5) |
| 12 | PA24 | TWIMS/0/TWCK | LCD connector (EXT5) |
| 13 | PB00 | USART/0/RXD | EXT4 |
| 14 | PB01 | USART/0/TXD | EXT4 |
| 15 | PC03 | SPI/NPCS[0] | |
| 16 | PA22 | SPI/MOSI | EXT2 and LCD connector (EXT5) |
| 17 | PA21 | SPI/MISO | EXT2 and LCD connector (EXT5) |
| 18 | PC30 | SPI/SCK | EXT2 and LCD connector (EXT5) |
| 19 | - | - | GND |
| 20 | - | - | VCC |
Table 4-2. Extension Header
EXT2| Pin on EXT2 | SAM4L8 pin | Function | Shared functionality |
|---|
| 1 | - | - | Communication line to ID chip on extension
board |
| 2 | - | - | GND |
| 3 | PA07 | ADCIFE/AD[2] | |
| 4 | PB02 | ADCIFE/AD[3] | |
| 5 | PC08 | GPIO | |
| 6 | PB10 | GPIO | LCD connector (EXT5) |
| 7 | PC04 | TC/1/A2 | |
| 8 | PC05 | TC/1/B2 | LCD connector (EXT5) |
| 9 | PC06 | EIC/EXTINT[8] | |
| 10 | PC09 | GPIO | |
| 11 | PB14 | TWIMS/3/TWD | EXT3, EXT4, and LCD connector (EXT5) |
| 12 | PB15 | TWIMS/3/TWCK | EXT3, EXT4, and LCD connector (EXT5) |
| 13 | PC26 | USART/1/RXD | EXT3 and LCD connector (EXT5) |
| 14 | PC27 | USART/1/TXD | EXT3 and LCD connector (EXT5) |
| 15 | PB11 | SPI/NPCS[2] | LCD connector (EXT5) |
| 16 | PA22 | SPI/MOSI | EXT1 and LCD connector (EXT5) |
| 17 | PA21 | SPI/MISO | EXT1 and LCD connector (EXT5) |
| 18 | PC30 | SPI/SCK | EXT1 and LCD connector (EXT5) |
| 19 | - | - | GND |
| 20 | - | - | VCC |
Table 4-3. Extension Header
EXT3| Pin on EXT3 | SAM4L8 pin | Function | Shared functionality |
|---|
| 1 | - | - | Communication line to ID chip on extension
board |
| 2 | - | - | GND |
| 3 | PB03 | ADCIFE/AD[4] | |
| 4 | PB04 | ADCIFE/AD[5] | |
| 5 | PC15 | GPIO | LCD connector (EXT5) |
| 6 | PC16 | GPIO | LCD connector (EXT5) |
| 7 | PA08 | TC/0/A0 | LCD connector (EXT5) |
| 8 | PA09 | TC/0/B0 | LCD connector (EXT5) |
| 9 | PA06 | EIC/EXTINT[1] | |
| 10 | PA10 | GPIO | LCD connector (EXT5) |
| 11 | PB14 | TWIMS/3/TWD | EXT2, EXT4, and LCD connector (EXT5) |
| 12 | PB15 | TWIMS/3/TWCK | EXT2, EXT4, and LCD connector (EXT5) |
| 13 | PC26 | USART/1/RXD | EXT2 and LCD connector (EXT5) |
| 14 | PC27 | USART/1/TXD | EXT2 and LCD connector (EXT5) |
| 15 | PA17 | GPIO | LCD connector (EXT5) |
| 16 | PA20 | UART/2/TXD | EXT4 and LCD connector (EXT5) |
| 17 | PA19 | UART/2/RXD | EXT4 and LCD connector (EXT5) |
| 18 | PA18 | UART/2/CLK | EXT4 and LCD connector (EXT5) |
| 19 | - | - | GND |
| 20 | - | - | VCC |
Table 4-4. Extension Header
EXT4| Pin on EXT4 | SAM4L8 pin | Function | Shared functionality |
|---|
| 1 | - | - | Communication line to ID chip on extension
board |
| 2 | - | - | GND |
| 3 | PB05 | ADCIFE/AD[6] | |
| 4 | PC10 | ADCIFE/AD[7] | USB_ID |
| 5 | PC17 | GPIO | LCD connector (EXT5) |
| 6 | PC18 | GPIO | LCD connector (EXT5) |
| 7 | PA12 | TC/0/A2 | LCD connector (EXT5) |
| 8 | PA13 | TC/0/B2 | LCD connector (EXT5) |
| 9 | PA16 | GPIO | LCD connector (EXT5) |
| 10 | PA15 | GPIO | LCD connector (EXT5) |
| 11 | PB14 | TWIMS/3/TWD | EXT2, EXT3, and LCD connector (EXT5) |
| 12 | PB15 | TWIMS/3/TWCK | EXT2, EXT3, and LCD connector (EXT5) |
| 13 | PB00 | USART/0/RXD | EXT1 |
| 14 | PB01 | USART/0/TXD | EXT1 |
| 15 | PA11 | GPIO | LCD connector (EXT5) |
| 16 | PA20 | UART/2/TXD | EXT3 and LCD connector (EXT5) |
| 17 | PA19 | UART/2/RXD | EXT3 and LCD connector (EXT5) |
| 18 | PA18 | UART/2/CLK | EXT3 and LCD connector (EXT5) |
| 19 | - | - | GND |
| 20 | - | - | VCC |
