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 1. External 32.768kHz
Crystal| Pin on SAM4L8 |
Function |
|---|
| XIN32 |
XIN32 |
| XOUT32 |
XOUT32 |
Table 2. External 12MHz
Crystal| Pin on SAM4L8 |
Function |
|---|
| PA00 |
XIN0 |
| PA01 |
XOUT0 |