33.8.1 Serial Programming Pin Mapping
| Symbol | Pins | I/O | Description |
|---|---|---|---|
| MOSI | PB3 | I | Serial Data in |
| MISO | PB4 | O | Serial Data out |
| SCK | PB5 | I | Serial Clock |
Note: The pin mapping for SPI programming is listed. Not all parts use the SPI pins dedicated
for the internal SPI interface.