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 1. Extension Header
EXT1Pin 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 2. Extension Header
EXT2Pin 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 3. Extension Header
EXT3Pin 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. Extension Header
EXT4Pin 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 |