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32 kHz Crystal Oscillator on i.MX6UL

Question asked by Jiri Luznicky on Aug 9, 2016
Latest reply on Aug 11, 2016 by Jiri Luznicky


we're trying to use 32kHz crystal for RTC clock instead of internal oscillator. According to Fig.59-2 in Chapter 59.4.1 of reference manual, internal oscillator should be disconnected by automatic mux when correct signal is detected on RTC_XTALI/O pins. Then bit RTC_XTAL_SOURCE in reg. XTALOSC24M_MISC0 should reads 1.

We're facing problem, that although we have correct signals on RTC_XTALI/O pins, we're still running on internal oscillator. We checked both power consumption and pin value.

So the question is, what important setting are we missing. And if switching to crystal means that internal oscillator is turned off, or whether continues ticking into void.


Thanks in advance