CAN has a specified way to create the bit timing. You could read the MCP2515 datasheet to get all the details. Here is one example. 8MHz to 50kbits/s
- MCP2515 divides the clock by 2 internally ( cannot be changed ) -> 4MHz
- MCP2515 divides the clock by 4 ( user choice in CNF1 register ) -> 1MHz
- 1MHz creates a 1µs Time Quanta ( that is what the CAN specification calls them )
- take 20 of these time quanta ( user choice CNF2 and CNF3 register ) to get 20µs
- 20µs creates 50kbits/s CAN bitrate
Yes, with CAN the bitrate is fixed.
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