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That is a very strange circuit - where did you find it?
The capacitor values suggest the crystal or resonator is extremely low frequency, possibly sub Hz which would make it almost impossible to manufacture.
1. Do not fit OSC_CAN, C33, C34 or Y1. Fit the link - the oscillator can then run in RC mode.
2. Do not fit OSC_CAN or the link but do fit C33, C34 and Y1. The oscillator then runs in internal crystal (LP, XT or HS mode) at the crystal frequency.
3. Fit OSC_CAN but do not fit the link, C33, C34 and Y1. The oscillator then runs in external clock source mode.
So answering your question, OSC_CAN is four pin oscillator module. One that has the crystal inside it and produces a square wave output. You choose the frequency you want, they are available from a few KHz up to around 100MHz.
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