There are some other references:
![:)]( "Smile")
Maybe that's all, disable XOSC, save the planet, problem solved.8.2. Crystal oscillator (XOSC)
8.2.1. Overview
...
If the user already has an accurate clock source, it is possible to drive an external clock directly into XIN (aka XI), and
disable the oscillator circuit. In this mode XIN can be driven at up to 50 MHz.
8.2.2. Changes from RP2040
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When using the XOSC XIN pin as a CMOS clock input from an external oscillator, the maximum is always
50 MHz. You do not have to configure CTRL.FREQ_RANGE for the CMOS input case. The CMOS input behaviour is
the same as RP2040.
Statistics: Posted by gmx — Thu Oct 30, 2025 1:59 am