[time-nuts] Why these Crystal Frequencies?
iteration69 at gmail.com
Thu Dec 15 02:42:23 EST 2011
adding to the sub ordinate: 32.768khz is a common resonator / crystal
frequency for Real Time Clocks. Note this is not time-nut RTC
My general rule of thumb is that anything that will cleanly divide by 2 (a
binary number) can be use for time applications with little or no work in
either hardware or software.
On Thu, Dec 15, 2011 at 2:37 AM, Javier Herrero <jherrero at hvsistemas.es>wrote:
> A lot of them are derivatives of the 2.4576 UART baud rate gen:
> 9.8304 = 2.4576 * 4
> 14.7456 = 2.4576 * 6
> 19.6608 = 2.4576 * 8
>> 22.1184 = 2.4576 * 9
> 24.567 = 2.4576 * 10
>> That is the reason why I've used some of them (14.7456MHz and
> 19.6608MHz) for clocking the HC11 variants with 4 and 5MHz internal clock
> (long ago... :) ).
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