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 4-5. 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 4-6. 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 |
