[time-nuts] 5370 processor boards available
Hal Murray
hmurray at megapathdsl.net
Wed Oct 8 22:16:34 UTC 2014
jks at jks.com said:
> I made a real mistake by not running the 5370's 10 MHz oven clock, that was
> available right there on a processor board pin, to a GPIO on the Beagle so
> it could be accurately counted with the built-in event counter and software
> overflow (that clock used to drive the processor clock of the old MC6800). A
> terminating resistor and level-shift are required if I remember correctly,
> so it would be slightly more effort than a "blue wire" fix.
Another option would be to connect it to the clock-in pin so the CPU runs in
lock step with a good clock.
I'm assuming there is a PLL inside the chip so the exact value of the
external clock doesn't matter as long as you are willing to patch the
software that sets up the PLL.
--
These are my opinions. I hate spam.
More information about the Time-nuts_lists.febo.com
mailing list