Will replacing the 18.432MHz crystal with an 18MHz one affect the speed of anything on the TINI besides the CAN bus?
If you change the 18.432MHz crystal, it will affect:
- CAN baud rates
- Serial baud rates
- System timer (software clock)
- 1-Wire timing
- Real-time clock
- Ethernet controller
If you do this modification it won't affect the serial baud rates (including 1-Wire timing) enough to matter; these are far more tolerant of variation than CAN, and can work fine even with a few percent error.
It has been reported on the TINI mailing list that changing the crystal to 18MHz works fine with CAN baud rates of 250 Kbps, 500 Kbps, and 1 Mbps. The serial ports are reported to function properly as well.