The SAM4L8 Xplained Pro kit contains two crystals that can be used
as clock sources for the SAM4L8 device. Each crystal has a cut-strap next to it that can be
used to measure the oscillator safety factor. This is done by cutting the strap and adding
a resistor across the strap. More information about oscillator allowance and safety factor
can be found in application note AVR4100.
Table 4-7. External 32.768kHz
Crystal| Pin on SAM4L8 | Function |
|---|
| XIN32 | XIN32 |
| XOUT32 | XOUT32 |
Table 4-8. External 12MHz
Crystal| Pin on SAM4L8 | Function |
|---|
| PA00 | XIN0 |
| PA01 | XOUT0 |
