The oscillators are not mapped to the normal PORT
functions and their multiplexing is controlled by registers in the Oscillators
Controller (OSCCTRL) and in the 32K Oscillators Controller (OSC32KCTRL).
Table 1. Oscillator Pinout
| Oscillator |
Supply |
Signal |
I/O pin |
| XOSC |
VDDIO |
XIN |
PB22 |
| XOUT |
PB23 |
| XOSC32K |
VSWOUT |
XIN32 |
PA00 |
| XOUT32 |
PA01 |
Note: In order to minimize the cycle-to-cycle
jitter of the external oscillator, keep the neighboring pins as steady as possible. For neighboring pin details, refer to the
Oscillator Pinout section.
Table 2. XOSC32K Jitter
Minimization
| Package |
Steady Signal Recommended |
| L22N |
PB00, PB01, PB02, PB03, PC00, PC01 |
| L22J |
PB00, PB01, PB02, PB03, PA02, PA03 |
| L22G |
PB02, PB03, PA02, PA03 |