How can I tell if my SmaRTClock or RTC is operating robustly?
Solution
On 'F9xx, Si10xx, and 32-bit devices, when using the SmaRTClock or RTC in Crystal Mode, an oscillator robustness test may be performed by routing the clock to a port pin and measuring the duty cycle. See the device data sheet for details on how to perform the crystal robustness test.
32 kHz Crystal Robustness