In addition to the Xplained Pro extension headers, SAM4S Xplained
Pro has two additional headers with spare signals that offers access to the I/O of the
microcontroller which are otherwise not easily available elsewhere or might be favorable to
have collected together. All headers have a pitch of 2.54mm.
Table 1. SPARE SIGNALS
Header| Pin on header |
SAM4S pin |
Function |
Shared functionality |
|---|
| 1 |
PA2 |
DATRG |
User button, SW0 |
| 2 |
PA9 |
PWMF10 |
EXT2 |
| 3 |
PA26 |
TI0A2 |
SD Card and PIOD Interface header |
| 4 |
PA27 |
TI0B2 |
SD Card and PIOD Interface header |
| 5 |
PA28 |
TCLK1 |
SD Card and PIOD Interface header |
| 6 |
PA29 |
TCLK2 |
SD Card and PIOD Interface header |
| 7 |
PA31 |
PCK2 |
SD Card and PIOD Interface header |
| 8 |
PB0 |
RTCOUT0 |
EXT2 |
| 9 |
PB1 |
RTCOUT1 |
EXT2 |
| 10 |
PB13 |
DAC0 |
|
| 11 |
PB14 |
DAC1 |
|
| 12 |
- |
- |
GND |
Table 2. PIOD INTERFACE
Header| Pin on header |
SAM4S pin |
Function |
Shared functionality |
|---|
| 1 |
PA15 |
PIODCEN1 |
LCD connector |
| 2 |
PA16 |
PIODCEN2 |
EXT3 |
| 3 |
PA23 |
PIODCCLK |
EXT1 |
| 4 |
PA24 |
PIODC0 |
EXT1 |
| 5 |
PA25 |
PIODC1 |
EXT1 |
| 6 |
PA26 |
PIODC2 |
SD Card and SPARE Signals header |
| 7 |
PA27 |
PIODC3 |
SD Card and SPARE Signals header |
| 8 |
PA28 |
PIODC4 |
SD Card and SPARE Signals header |
| 9 |
PA29 |
PIODC5 |
SD Card and SPARE Signals header |
| 10 |
PA30 |
PIODC6 |
SD Card |
| 11 |
PA31 |
PIODC7 |
SD Card and SPARE Signals header |
| 12 |
- |
- |
GND |