Re: CANBus Baud Rates
Bryan Armstrong <bryan.armstrong-6tN4nzCoH/[email protected]>
| Newsgroups | gmane.comp.hardware.microcontrollers.tini |
|---|---|
| Message-ID | <[email protected]> |
Vic wrote: > Does changing the crystal affect the clock, > performance or other parts of TINI's operation? Yes, the CPU will be slower. Some baud rates on serial ports may be unattainable without lots of bit error. > Instead of 14Mhz could I change to 18Mhz. Yes, but you will need to recalculate the critical timing parameters of your RAM and Flash to make sure they will not be violated when the frequency goes up. > Why was 18.432Mhz chosen in the first place, if its > known to cause CAN speed issues. Is there a specific > subsystem that requires such frequency for proper > operation? 18.432MHz is what we call a "baud rate crystal". Pick any baud rate and divide into 18.432MHz and you will always get a whole number (i.e. zero bit error). Other good baud rate crystals are: 11.0592, 14.7456, 22.1184 and multiples of these. -- -- Bryan Armstrong bryan.armstrong-6tN4nzCoH/[email protected] _______________________________________________ TINI mailing list TINI-6tN4nzCoH/[email protected] To UNSUBSCRIBE, edit your profile, or see list archives: http://lists.dalsemi.com/mailman/listinfo/tini