The following lists the possible internal SERCOM module pad function assignments for the four SERCOM pads in both SPI Master and SPI Slave modes.
They are combinations of DOPO and DIPO in CTRLA. Note that this is in addition to the physical GPIO pin MUX of the device, and can be used in conjunction to optimize the serial data pin-out.
The following table describes the SERCOM pin functionalities for the various MUX settings, whilst in SPI Master mode.
| Combination | DOPO / DIPO | SERCOM PAD[0] | SERCOM PAD[1] | SERCOM PAD[2] | SERCOM PAD[3] |
|---|---|---|---|---|---|
| A | 0x0 / 0x0 | MOSI | SCK | - | - |
| B | 0x0 / 0x1 | MOSI | SCK | - | - |
| C | 0x0 / 0x2 | MOSI | SCK | MISO | - |
| D | 0x0 / 0x3 | MOSI | SCK | - | MISO |
| E | 0x1 / 0x0 | MISO | - | MOSI | SCK |
| F | 0x1 / 0x1 | - | MISO | MOSI | SCK |
| G | 0x1 / 0x2 | - | - | MOSI | SCK |
| H | 0x1 / 0x3 | - | - | MOSI | SCK |
| I | 0x2 / 0x0 | MISO | SCK | - | MOSI |
| J | 0x2 / 0x1 | - | SCK | - | MOSI |
| K | 0x2 / 0x2 | - | SCK | MISO | MOSI |
| L | 0x2 / 0x3 | - | SCK | - | MOSI |
| M | 0x3 / 0x0 | MOSI | - | - | SCK |
| N | 0x3 / 0x1 | MOSI | MISO | - | SCK |
| O | 0x3 / 0x2 | MOSI | - | MISO | SCK |
| P | 0x3 / 0x3 | MOSI | - | - | SCK |
The following table describes the SERCOM pin functionalities for the various MUX settings, whilst in SPI Slave mode.
| Combination | DOPO / DIPO | SERCOM PAD[0] | SERCOM PAD[1] | SERCOM PAD[2] | SERCOM PAD[3] |
|---|---|---|---|---|---|
| A | 0x0 / 0x0 | MISO | SCK | /SS | - |
| B | 0x0 / 0x1 | MISO | SCK | /SS | - |
| C | 0x0 / 0x2 | MISO | SCK | /SS | - |
| D | 0x0 / 0x3 | MISO | SCK | /SS | MOSI |
| E | 0x1 / 0x0 | MOSI | /SS | MISO | SCK |
| F | 0x1 / 0x1 | - | /SS | MISO | SCK |
| G | 0x1 / 0x2 | - | /SS | MISO | SCK |
| H | 0x1 / 0x3 | - | /SS | MISO | SCK |
| I | 0x2 / 0x0 | MOSI | SCK | /SS | MISO |
| J | 0x2 / 0x1 | - | SCK | /SS | MISO |
| K | 0x2 / 0x2 | - | SCK | /SS | MISO |
| L | 0x2 / 0x3 | - | SCK | /SS | MISO |
| M | 0x3 / 0x0 | MISO | /SS | - | SCK |
| N | 0x3 / 0x1 | MISO | /SS | - | SCK |
| O | 0x3 / 0x2 | MISO | /SS | MOSI | SCK |
| P | 0x3 / 0x3 | MISO | /SS | - | SCK |
1.8.5