The SAM4S 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 standard extension header
specified in Xplained Pro Standard Extension Header. All headers have a pitch of 2.54mm.
Table 1. Extension Header
EXT1| Pin on EXT1 |
SAM4S pin |
Function |
Shared functionality |
|---|
| 1 |
- |
- |
Communication line to ID chip on extension board. |
| 2 |
- |
- |
GND |
| 3 |
PA17 |
AD[0] |
|
| 4 |
PA18 |
AD[1] |
|
| 5 |
PA24 |
GPIO |
PIOD Interface Header |
| 6 |
PA25 |
GPIO |
PIOD Interface Header |
| 7 |
PA23 |
PWMH0 |
PIOD Interface Header |
| 8 |
PA19 |
PWML0 |
|
| 9 |
PA1 |
WKUP1/GPIO |
|
| 10 |
PA6 |
GPIO |
DGI_GPIO0 on EDBG |
| 11 |
PA3 |
TWD0 |
EXT2 and EDBG |
| 12 |
PA4 |
TWCK0 |
EXT2 and EDBG |
| 13 |
PA21 |
USART1/RXD1 |
EXT2 |
| 14 |
PA22 |
USART1/TXD1 |
EXT2 |
| 15 |
PA11 |
SPI/NPCS[0] |
|
| 16 |
PA13 |
SPI/MOSI |
EXT2, EXT3, LCD connector (EXT4) and EDBG |
| 17 |
PA12 |
SPI/MISO |
EXT2, EXT3, LCD connector (EXT4) and EDBG |
| 18 |
PA14 |
SPI/SPCK |
EXT2, EXT3, LCD connector (EXT4) and EDBG |
| 19 |
- |
- |
GND |
| 20 |
- |
- |
VCC |
Table 2. Extension Header
EXT2| Pin on EXT2 |
SAM4S pin |
Function |
Shared functionality |
|---|
| 1 |
- |
- |
Communication line to ID chip on extension board. |
| 2 |
- |
- |
GND |
| 3 |
PB0 |
AD[4] |
|
| 4 |
PB1 |
AD[5] |
|
| 5 |
PC24 |
GPIO |
DGI_GPIO2 on EDBG |
| 6 |
PC25 |
GPIO |
DGI_GPIO3 on EDBG |
| 7 |
PC19 |
PWMH1 |
|
| 8 |
PA20 |
PWML1 |
|
| 9 |
PC26 |
GPIO |
|
| 10 |
PC27 |
GPIO |
|
| 11 |
PA3 |
TWD0 |
EXT1 and EDBG |
| 12 |
PA4 |
TWCK0 |
EXT1 and EDBG |
| 13 |
PA21 |
USART1/RXD1 |
EXT1 |
| 14 |
PA22 |
USART1/TXD1 |
EXT1 |
| 15 |
PA9 |
SPI/NPCS[1] |
LCD connector (EXT4) |
| 16 |
PA13 |
SPI/MOSI |
EXT1, EXT3, LCD connector (EXT4) and EDBG |
| 17 |
PA12 |
SPI/MISO |
EXT1, EXT3, LCD connector (EXT4) and EDBG |
| 18 |
PA14 |
SPI/SPCK |
EXT1, EXT3, LCD connector (EXT4) and EDBG |
| 19 |
- |
- |
GND |
| 20 |
- |
- |
VCC |
Table 3. Extension Header
EXT3| Pin on EXT3 |
SAM4S pin |
Function |
Shared functionality |
|---|
| 1 |
- |
- |
Communication line to ID chip on extension board. |
| 2 |
- |
- |
GND |
| 3 |
PC29 |
AD[13] |
|
| 4 |
PC30 |
AD[14] |
|
| 5 |
PC21 |
GPIO |
|
| 6 |
PC22 |
GPIO |
DGI_GPIO1 on EDBG |
| 7 |
PC20 |
PWMH2 |
|
| 8 |
PA16 |
PWML2 |
PIOD Header |
| 9 |
PA0 |
WKUP0/GPIO |
LCD connector (EXT4) |
| 10 |
PC31 |
GPIO |
|
| 11 |
PB4 |
TWD1 |
LCD connector (EXT4) |
| 12 |
PB5 |
TWCK1 |
LCD connector (EXT4) |
| 13 |
PB2 |
USART1/RXD1 |
CDC UART |
| 14 |
PB3 |
USART1/TXD1 |
CDC UART |
| 15 |
PA10 |
SPI/NPCS[2] |
LCD connector (EXT4) |
| 16 |
PA13 |
SPI/MOSI |
EXT1, EXT2, LCD connector (EXT4) and EDBG |
| 17 |
PA12 |
SPI/MISO |
EXT1, EXT2, LCD connector (EXT4) and EDBG |
| 18 |
PA14 |
SPI/SPCK |
EXT1, EXT2, LCD connector (EXT4) and EDBG |
| 19 |
- |
- |
GND |
| 20 |
- |
- |
VCC |