On Mon, 25 May 1998 09:44:04 -0600 Matt Bonner <mbonner@SUNADA.COM>
writes:
>Tjaart van der Walt wrote:
>>  1.8432MHz
>   2.4576MHz ... Any more?
>>  3.6864MHz
>>  11.0592MHz
>
>> You can get all the standard baud rates with these crystals.

There are two major 'series' of frequencies, with standard crystals
available at each power of 2 in the series:

(9600 * 192): 1.8432, 3.6864, 7.3728, 14.7456 MHz
(9600 * 256): 2.4576, 4.9152, 9.8304, 19.6608 MHz

A 9.8304 is a good match for a 10 MHz PIC16F84, or 19.6608 with a PIC
rated for 20 MHz.  Most 4 MHz PICs have no problem with 4.9152, but use
3.6864 to be safe.  Also fairly common are 18.432 (1.8432 * 10) and
11.0592 (1.8432 * 6).  The latter is very popular with 8051 type
controllers because of the way they divide the clock.  Frequencies of
6.144 (9600 * 640) and 12.288 MHz were commonly used with Intel parts
rated for 6 or 12 MHz respectively.


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