I am using the Kinetis MKL05 and and will have a 32.768KHz crystal oscillator connected. I will start in FEI mode for the internal reference clock (because I cannot wait 400 ms for startup) and will poll the OSCINIT0 bit for the external oscillator. Once initialized I hand over the clock from the internal to the external reference.
Now this product will be in extreme environments and will be running up to about 85°C - 90°C.
In the event that I have a loss of OSC0 reference clock for my crystal oscillator, I need to recover gracefully.
I see that I can set the LOCRE0 (Loss of Clock Reset Enabled) to either
0 - Interrupt request is generated on a loss of OSC0 external reference clock.
1 - Generate a reset request on a loss of OSC0 external reference clock.
If an interrupt is generated, can I revert back to my internal reference clock gracefully? Or will the device have to perform some sort of reset regardless?