7.2 Internal Multiplexed Signals
PA20, PB00, PB15, PB30, PB31, PC16, PC18 and PC19 are controlled by the PORT as general purpose I/O by default and, alternatively, may be assigned to one of the peripheral functions A, B, C, D, E, F, G or H. To enable a peripheral function on a pin, the Peripheral Multiplexer Enable bit in the Pin Configuration register corresponding to that pin (PINCFGn.PMUXEN, n = 0-31) in the PORT must be written to one. The selection of peripheral functions A to H is done by writing to the Peripheral Multiplexing Odd and Even bits in the Peripheral Multiplexing register (PMUXn.PMUXE/O) in the PORT.
PA10, PA11, PB16 and PB17 cannot be configured as output ports. These ports are always connected to the RFCTRL inputs.
| A | A | B | B | B | B | B | C | D | E | F | G | H | I | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Internal Signal | IO Pin | Supply | Type | EIC | RSTC | REF | ADC | AC |
PTC X-lines |
PTC Y-lines | SERCOM | SERCOM-ALT |
TC/ TCC |
FECTRL/ TCC/ SERCOM | COM |
AC/ GCLK | CCL |
| DIG3 | PA10 | VDDIO | Input | EXTINT[10] | — | — | AIN[18] | — | X[2] | Y[8] | SERCOM0/PAD[2] | SERCOM2/PAD[2] | TCC1/WO[0] | TCC0/WO[2] | — | GCLK_IO[4] | CCL1/IN[5] |
| DIG4 | PA11 | VDDIO | Input | EXTINT[11] | — | — | AIN[19] | — | X[3] | Y[9] | SERCOM0/PAD[3] | SERCOM2/PAD[3] | TCC1/WO[1] | TCC0/WO[3] | — | GCLK_IO[5] | CCL1/OUT[1] |
| SLP_TR | PA20 | VDDIO | I/O | EXTINT[4] | — | — | — | — | X[8] | — | SERCOM5/PAD[2] | SERCOM3/PAD[2] | TC3/WO[0] | TCC0/WO[6] | — | GCLK_IO[4] | — |
| IRQ | PB00 | VDDANA | I/O | EXTINT[0] | — | — | AIN[8] | — | — | — | — | SERCOM5/PAD[2] | TC3/WO[0] | — | — | SUPC/PSOK | CCL0/IN[1] |
| RSTN | PB15 | VDDIO | I/O | EXTINT[15] | — | — | — | — | X[15] | — | SERCOM4/PAD[3] | — | TC1/WO[1] | — | — | GCLK_IO[1] | CCL3/IN[10] |
| DIG1 | PB16 | VDDIO | Input | EXTINT[0] | — | — | — | — | — | — | SERCOM5/PAD[0] | — | TC2/WO[0] | TCC0/WO[4] | — | GCLK_IO[2] | CCL3/IN[11] |
| DIG2 | PB17 | VDDIO | Input | EXTINT[1] | — | — | — | — | — | — | SERCOM5/PAD[1] | — | TC2/WO[1] | TCC0/WO[5] | — | GCLK_IO[3] | CCL3/OUT[3] |
| MOSI | PB30 | VDDIO | I/O | EXTINT[14] | — | — | — | — | — | — | — | SERCOM5/PAD[0] | TCC0/WO[0] | SERCOM4/PAD[2] | — | — | — |
| SEL | PB31 | VDDIO | I/O | EXTINT[15] | — | — | — | — | — | — | — | SERCOM5/PAD[1] | TCC0/WO[1] | SERCOM4/PAD[1] | — | — | — |
| CLKM | PC16 | VDDIO | I/O | — | — | — | — | — | — | — | — | — | — | — | — | GCLK_IO[1] | — |
| SCLK | PC18 | VDDIO | I/O | — | — | — | — | — | — | — | — | — | — | SERCOM4/PAD[3] | — | — | — |
| MISO | PC19 | VDDIO | I/O | — | — | — | — | — | — | — | — | — | — | SERCOM4/PAD[0] | — | — | — |