32.4 Signal Description
| Signal Name | Type | Description |
|---|---|---|
| PAD[0] | Digital I/O | SDA |
| PAD[1] | Digital I/O | SCL |
| PAD[2] | Digital I/O | SDA_OUT (4-wire operation) |
| PAD[3] | Digital I/O | SCL_OUT (4-wire operation) |
One signal can be mapped on several pins.
Not all the pins are I2C pins.
Refer to the Pinout chapter for more information.
In order to use the I/O lines of this peripheral, the I/O pins must be configured using the I/O Pin Controller (PORT).
When the SERCOM is used in I2C mode, the SERCOM controls the direction and value of the I/O pins. If the receiver or transmitter is disabled, these pins can be used for other purposes.
All SERCOM I2C pins support the Fast Mode frequency. The High Speed frequency is only supported by the following pins:
| SERCOM | Pads | Package | |||
|---|---|---|---|---|---|
| 32-pins | 48-pins | 64-pins | 100-pins | ||
| 0 | pad0 | PA08 | |||
| pad1 | PA09 | ||||
| 1 | pad0 | PA16 | |||
| pad1 | PA17 | ||||
| 2 | pad0 | PA08 | PA08, PA12 | ||
| pad1 | PA09 | PA09, PA13 | |||
| 3 | pad0 | PA16, PA22 | |||
| pad1 | PA17, PA23 | ||||
| 4 | pad0 | NA | PA12 | ||
| pad1 | PA13 | ||||
| 5 | pad0 | PA22 | |||
| pad1 | PA23 | ||||
| 6 | pad0 | NA | NA | PC16 | |
| pad1 | PC17 | ||||
| 7 | pad0 | PC16 | |||
| pad1 | PC17 | ||||