TVB can give a better answer, but in general the number of clock cycles
required per instruction limits the minimum divide ratio.
Tom whipped up a special PIC to get the highest possible output rate for
a set of tests we were doing, and given the 20 MHz maximum input clock,
we got about 800 kHz output.
John
---
On 7/24/2012 1:05 PM, Chris Hoffman, KG6O wrote:
John,
That's interesting to me. What exactly are the actual structural limitations of
[that] pic?
-CH
On Jul 24, 2012, at 7:55, John Ackermann N8UR <j...@febo.com> wrote:
Unfortunately, the TAPR T2-Mini divider (http://www.tapr.org/kits_t2-mini.html)
can't quite get to 1 MHz from 10 MHz with the PIC divider chip due to
limitations in the chip architecture.
However, nothing says you couldn't "dead bug" in a decade divider chip in place
of the PIC, and let the T2-Mini provide the input conditioning, output driver, voltage
regulation, connectorization, etc. for you, making it much a smaller project.
John
----
On 7/24/2012 8:18 AM, Chris Wilson wrote:
24/07/2012 13:14
My Racal Dana 9908 can take a 1 Mhz external reference. Inputting my
Thunderbolt at 10 MHz works, but shifts the decimal point over. I am
not sure if this has any other detrimental effects as to accuracy or
other? What's the easiest way to have a 1 MHz reference from the
Thunderbolt for this timer / counter please, yet retaining 10 Mhz for
my other devices that want a 10MHz reference signal? Thanks.
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